1. What is the Clean Water Program and Why Is It Needed?
The Clean Water Program is a comprehensive plan to upgrade San Mateo’s wastewater collection system and wastewater treatment plant to provide reliable service for years to come. The wastewater treatment plant is owned by the Cities of San Mateo and Foster City/Estero Municipal Improvement District. The wastewater treatment plant also serves Crystal Springs County Sanitation District, a portion of unincorporated San Mateo County, and the southern portion of the Town of Hillsborough. Those services are paid for by partner agency reimbursements.
The Clean Water Program is intended to meet the following goals:
- To replace aging pipes and facilities. Sewer pipes have an average lifespan of 50-60 years, and most of San Mateo’s sewer pipes were constructed between 1900 and 1960. The wastewater treatment plant has many components that are over 75 years old, and nearly half of the system is reaching the end of its useful life. Although it has been maintained and upgraded over the years, improvements to meet current and future operating requirements are needed.
- To meet current and future regulatory requirements and increase system capacity during heavy rains. The regulatory environment that protects our community continues to change. We are responding to the current direction of regulators (the Regional Water Quality Control Board) that require speciﬁc corrective actions to prevent sewer overflows during heavy rains, while planning for future regulations related to the quality of our treated wastewater.
- To align with long-term sustainability goals. Improvements to the wastewater treatment plant and sewer collection system will protect public health and the health of San Francisco Bay. The higher-quality water will become a source of recycled water that can be reused for landscaping and other uses. Additionally, the solid waste can be turned into an alternative fuel source for City vehicles.
2. How does the wastewater collection and treatment system work?
In San Mateo, wastewater from homes and businesses is collected via a system of pipes (sewer laterals and mains) and pump stations. The collection system includes about 234 miles of pipelines, more than 5,500 manholes, and 26 pump stations. The collection system transports the wastewater to the treatment plant. There, it undergoes a series of biological and physical treatment processes so that it is suitable for discharge into the San Francisco Bay. The plant treats an average of 12 million gallons per day during summer months; during heavy rains, the plant can receive up to 8 times greater than the average normal flows.
Because the system does not have the capacity to treat the extra wastewater during heavy rains, sometimes sanitary sewer overflows (SSOs) occur. An SSO is the result of high volumes of rainwater mixing with sewage and exceeding the system’s capacity to transport and treat it. The Regional Water Quality Control Board has issued the City with a Cease and Desist Order for SSOs.
Read Wastewater: The Basics to learn more about San Mateo’s sewer collection system and Wastewater Treatment Plant!
3. What happens if we do not comply with regulatory requirements?
Failure to meet our permit obligations (i.e., treating the discharged water to an acceptable quality) and Regional Water Quality Control Board requirements (e.g., preventing sewer overflows) by mandated deadlines could result in large fines that will be passed on to ratepayers.
4. How are the Clean Water Program projects funded?
The program is funded by sewer use fees paid by all properties that tie into the sewer collection system. The City is seeking grants and low-interest loans to finance the capital improvements needed, while minimizing the impacts on sewer rates.
5. What has the Program team done for community notification and outreach so far during the Clean Water Program process? What will be done to improve community notification and outreach during the remainder of the Clean Water Program process?
Several communication channels are used to inform the public of new information and upcoming meetings. These channels include mailing of community meeting invitations, sending invitations to City Council and Boards/Commissions, and updating the City’s events calendar and Clean Water Program website. Additionally, the City emails residents, Homeowners Associations, and other community groups; posts to social media sites, such as NextDoor, Facebook, Twitter, and YouTube; and distributes press releases to various media contacts. The Program will continue to send community information through these channels, and the City encourages the public to subscribe to the email list and to NextDoor.com to stay up to date with City and Program activities.
1. What improvements are being made at the wastewater treatment plant and why are they necessary? What is the benefit of these improvements to our communities?
The Clean Water Program is a comprehensive plan to upgrade San Mateo’s wastewater collection system and wastewater treatment plant to benefit and protect the public and environmental health of the communities served – San Mateo, Foster City, Crystal Springs County Sanitation District, a portion of unincorporated San Mateo County, and a portion of the Town of Hillsborough. The improvements at the wastewater treatment plant are intended to replace aging infrastructure, meet current and future regulatory requirements, increase system capacity during heavy rains, and align with long-term sustainability goals to provide reliable service for years to come.
2. Why are wastewater treatment plant upgrades needed now?
The regulatory environment that protects our communities continues to change. Not completing the capital improvements will lead to the City of San Mateo, and its regional partner agencies, failing to comply with the Regional Water Quality Control Board’s Cease and Desist Order and the National Pollutant Discharge Elimination System permit requirements. Failure to comply with cease and desist order and permit requirements, by mandated deadlines, could result in large fines that will be passed on to ratepayers. Our infrastructure will continue to deteriorate and will continue to have failures. These failures include sanitary sewer overflows that leak diluted raw sewage and pollutants onto our communities’ streets and into our creeks, beaches, lagoon, and the San Francisco Bay. During heavy rains, the wastewater treatment plant can be overwhelmed and must blend, or partially treat, the wastewater, which does not meet current and future regulatory discharge permit requirements. Sanitary sewer overflows and blending at the treatment plant are significant health concerns that negatively impact the community and the environment.
3. How will the wastewater treatment plant implement green and sustainable practices?
One of the objectives of the Clean Water Program is to align with long-term sustainability goals. The design for the wastewater treatment plant will pursue LEED Silver Certification for the new Administration Building and follow ENVISION guidelines for sustainable infrastructure for the overall project where appropriate.
4. What changes are being made to the wastewater treatment plant’s site/footprint?
The wastewater treatment plant improvements will be constructed on the adjacent parcel north of the existing treatment plant. The existing plant must remain in operation while the new plant is constructed. When construction is completed, the solids handling facilities on the existing site will be integrated with the new improvements, and the liquid processing facilities that are no longer needed will be demolished or repurposed.
5. When is construction of the wastewater treatment plant anticipated to begin?
Major construction is anticipated to begin in fall 2018, once the required permits are obtained. Minor activities, such as clearing the site of vegetation, are anticipated to begin as early as the summer of 2017.
6. How long will the construction of the wastewater treatment plant upgrade and expansion take?
Major construction is expected to begin in the fall of 2018 and be completed in five years. The overall project will consist of site preparation, major construction, testing, startup, and commissioning.
7. Will noise and dust be generated from the construction?
Applicable Bay Area Air Quality Management District emission control measures will be implemented during construction to mitigate dust generation. The details of the emission control measures will continue to develop as the design progresses. Approved work hours for construction activities and best practices will be employed to reduce sound levels from construction activities as much as practical. Notification protocols will be established to notify the surrounding neighborhood of construction activities, times, and contact information.
8. Will there be odors during construction, and how will odor be mitigated? Will there be more odor after construction since the plant will be larger?
Best practices will continue to be employed by the wastewater treatment plant staff during construction to continue efficient operation of the existing odor control systems. The new wastewater treatment plant facilities are being designed with odor control systems that meet or exceed the efficiency of the systems currently in place and therefore future odor generation is expected to decrease compared to current conditions.
9. Will the construction area be fenced and secured?
The wastewater treatment plant construction site will be fenced where necessary to provide security and public safety.
10. What traffic impacts will construction have on the neighborhood by the treatment plant, and how will this be mitigated? What truck routes are being considered?
The Clean Water Program will prepare and implement a traffic management plan to minimize the impacts of construction activities on traffic and public access to recreational facilities. The details of the traffic management plan will continue to develop as the design progresses. Any truck routes established in the future traffic management plan will comply with “Chapter 11 – Vehicles and Traffic” of the City’s Municipal Code.
11. Will construction impact public access to the dog parks and Bay Trail? Will public access improvements be provided as part of the project?
A traffic management plan will be prepared and implemented to minimize the impacts of construction activities on vehicular, pedestrian, and bicycle access to nearby parks and the Bay Trail. Various routes may be developed to provide temporary and permanent access to the parks and Bay Trail both during and after construction. A permanent pedestrian and bicycle access route around the wastewater treatment plant is being considered to allow pedestrians and bicyclists to cross between the east and west ends of the plant.
12. My children go to the nearby school. Will their walk to school be impacted?
The Clean Water Program will prepare and implement a traffic management plan to minimize the impacts of construction activities to pedestrians. Potential impacts to adjacent schools, residents, and businesses will be taken into consideration during the preparation of the traffic management plan as design progresses.
13. What kind of trees and landscaping will be planted on the expanded site?
Preliminary planting image boards will be made available on the Clean Water Program’s website through the planning process. Final landscaping design and planting schedules will be developed later in the planning process.
14. Will there be more meetings for the community to share input and comments? Who do I call if I have issues during construction?
Public outreach and transparency are important components of the Clean Water Program. The Clean Water Program staff hosts community meetings and reaches out to neighborhood and community organizations when important topics that affect the community need to be communicated. In addition, this website contains project documents, presentations, and videos posted to inform and educate the community. The Clean Water Program will establish a telephone number for use by the public to report any conditions associated with construction.
15. Does the design account for sea level rise?
The wastewater treatment plant is protected by an existing levee system that is operated and maintained by the City of San Mateo and the City of Foster City. As a secondary level of protection, the new facilities will be elevated to protect equipment and facilities by incorporating a 3-foot water surface elevation increase over the Base Flood Elevation, based on projected sea level rise for the Year 2100.
16. The City of San Mateo’s sewer rates have gone up. Does the new rate cover this WWTP project or will the rates continue to go up in the future?
The increase in rates was established to fund the Clean Water Program, which is a $900 million capital improvement program to upgrade San Mateo’s wastewater collection system and the San Mateo Wastewater Treatment Plant. The City is evaluating a sewer rate restructure to incorporate a fixed fee component, plus evaluating a multi-year rate adjustment to improve the stability and predictability of sewer revenues needed to fund the improvements.
17. Since the San Mateo wastewater system provides services to neighboring agencies, will these other jurisdictions be paying their fair share?
The wastewater treatment plant is owned by the Cities of San Mateo and Foster City/Estero Municipal Improvement District. Capital improvements at the wastewater treatment plant are paid for by both owners, based on their ownership distribution of the new improvements. The wastewater treatment plant also treats wastewater for Crystal Springs County Sanitation District, a portion of unincorporated San Mateo County, and the southern portion of the Town of Hillsborough. Those customer agencies pay for the sewer services the City of San Mateo provides.
18. How tall will the new buildings be and how will they look from the road?
The height of the upgraded and expanded facilities will be no taller than the existing digesters, which are the egg-shaped structures and the tallest facilities on the existing plant. The new facilities will comply with maximum height limitations per the City of San Mateo General Plan and Municipal Code. Below is a conceptual rendering of the new facilities. (NOTE: This rendering is subject to change as the design process progresses.)
19. Will other collection system projects, such as pipes and/or pump stations, be under construction near the wastewater treatment plant site? Will these projects impact the neighborhood streets?
The Clean Water Program is a comprehensive Capital Improvement Program that, in addition to the wastewater treatment plant project, includes various collection system pipe improvements throughout San Mateo. Projects are planned for Dale Avenue and near the Dale Avenue Pump Station. In addition, the Basin 4 Collection System Improvements Project is south of the WWTP and is undergoing final pipe improvement alignment determination. The exhibit below illustrates the collection system improvement locations.
1. Why is the City doing this pipe condition assessment?
As a part of the Clean Water Program’s (CWP’s) comprehensive approach to assessing and upgrading its aging wastewater collection and treatment system, we are evaluating how, how much, and where storm water enters the sewer collection system.
This storm water entering the sewer system is called Inflow and Infiltration (I/I). During heavy rains, excess amounts of storm water entering the system can overwhelm its capacity, causing sewer overflows. The City’s intent is to prevent storm water from entering the sewer system. The CWP identified the I/I project as one way to help determine the best methods of reducing I/I and flows to the treatment plant to reduce system overflows.
The first step is a pilot project to assess the condition of the sewer collection system. We will be looking at sewer mains, manholes, sewer laterals, and storm drains to find cross-connections, leaks, breaks and other defects.
The condition assessment consists of three types of work:
- Video inspections of the sewer mains and laterals (the pipes that connect your home to the system)
- Non-toxic smoke testing
- Non-toxic colored water tracer testing
The condition assessment area is broken into two zones (see map). Zone 1 covers the northern portion of the Marina Lagoon neighborhood, east of the Kehoe Ave. and Roberta Dr. intersection. Zone 2 covers from Kehoe Ave. south to the intersection of Roberta Dr. and Eisenhower St., and east of Van Buren St. and Eisenhower St. to the lagoon. Also in Zone 2, we will be mapping backyard sewer laterals using GPS.
2. Why was this area selected for the assessment activities?
This area of San Mateo has historically had higher-than-normal sewer flows during heavy rains, which are likely caused by inflow and infiltration of storm water. Flows can increase by 20 to 30 times more than the flows during dry weather. (The industry norm is 3 to 5 times.) These high flows frequently result in sewer overflows into the streets that are unsafe for public health and the environment. Also, because of the age of the neighborhood and its location on the lagoon, it was identified as a priority area for the pipe condition assessment. The results of this assessment will be used to help the City determine top priorities and methods for repair throughout San Mateo. Your neighborhood’s involvement in this assessment will provide benefits for the entire community.
3. What is a Right-of-Entry (ROE) and why is it needed?
Some parcels in this neighborhood have mains, drains, and manholes in their backyards. For these properties, the City holds a public utility easement and has the right to access the easement for operations and maintenance.
However, the property owner’s permission is needed for field crews to conduct video inspection and mapping of private laterals and for entering backyards to document any smoke releases from the smoke testing. The ROEs are standard practice for the City and industry-wide. They allow a temporary right to enter your property to perform specific activities. They also release the property owner from certain liabilities and establish that no liens will be created.
Only property owners, not tenants, are required to sign the ROE. If you have any questions about an ROE you received in the mail, please call the Clean Water Program Hotline at (650) 727-6870, or email us at info@CleanWaterProgramSanMateo.org.
4. How does smoke testing work?
A non-toxic smoke is blown into parts of the sewer system, and it will follow help identify where inflow and infiltration may happen. As shown in the figure below, potential smoke release locations include roof vents, catch-basins, clean-outs, roof down-spouts and pipe and manhole defects.
5. Is the smoke harmful?
The smoke is clean and non-toxic to humans, pets, food, plants, and material items and no smoke will enter your home or business if it is properly plumbed, vented, and the P-traps contain water.
6. What do I need to do to be prepared? What do I do if smoke comes in my home?
To prepare for the smoke testing activity, residents should fill P-traps in unused sinks and drains by running water for 5 seconds. We recommend checking for and adding water to sinks and drains that may not be used often—such as a garage drain, utility sink, or guest bathroom sink and shower. If smoke does enter your home, open windows for ventilation, and then inform the crew chief doing the testing in your area.
7. Do I need to be home when the work is being done?
Residents will be notified approximately 48 to 72 hours before work begins. You do not need to be home, but please make sure the work crews have access to your backyard. Please unlock your gate and make sure your dogs are not in the backyard. The field crews will also knock on your door before performing the testing.
8. How long will this take?
Work is expected to begin in late November or early December of 2017. Video inspections and lateral mapping will take about 1 – 2 hours per parcel. Smoke testing for the entire neighborhood is expected to take 3 to 5 days. If a smoke release is identified on your property, it will take the field crew up to 15 minutes to photograph and document the release.
9. What happens if you find damaged sewer mains or laterals?
Based on the results of this condition assessment, we will determine what fixes are top priority with the most benefit to the neighborhood as a whole and consider the appropriate methods for repairs.
10. What happens next?
The results of this condition assessment will be used to help the City determine top priorities and methods for repair throughout San Mateo. Your neighborhood’s involvement in this condition assessment will provide benefits for the entire community.
If you have any questions or concerns, please call the Clean Water Program Hotline at (650) 727-6870, or email us at info@CleanWaterProgramSanMateo.org.
1. What is the process for selecting the final underground storage facility location alternative and when did this site selection process begin? Where will the underground storage facility be located? Has a specific site been recommended?
The 2014 Integrated Wastewater Master Plan and the 2016 certified Programmatic Environmental Impact Report (PEIR) identified a total of 55 alternatives, based on properties with potential sufficient space for the facility. These included municipal properties, schools, undeveloped property, private property, and parking lots. The PEIR also indicated a shortlist of 12 alternatives based on hydraulic modeling and beneficial impacts on addressing the City’s sanitary sewer overflow (SSO) issues.
The shortlisted alternatives were then evaluated based on hydraulics, constructability, right-of-way, contractor laydown, parking, and storage capacity. This technical analysis identified five alternatives to transition into an Alternatives Analysis that evaluated each alternative against non-economic criteria (technical, social, and environmental) and economic criteria (construction cost, operation and maintenance cost, easement and usage fee costs, and life-cycle costs). The non-economic criteria score and cost were determined for each site and a relative comparison of pros and cons was completed. Seventeen meetings with the public were conducted between August through December 2016, including Community Open House meetings, Public Works Commission, Parks & Recreation Commission, and meetings with several homeowner associations to discuss the process, purpose, gather community input, and identify key issues. The feedback received at these meetings was incorporated into the Alternatives Analysis.
The results of the Alternatives Analysis were presented to the Public Works Commission in December 2016 and to the City Council in January 2017. The Commission and the Council screened the five alternatives and identified 1) the Corporation Yard and 2) San Mateo County Event Center as their preferred two alternatives to progress to the next steps of design and to be further evaluated for potential impacts.
The two preferred alternatives’ conceptual layouts were optimized for each site, required permanent and temporary construction easements were determined, and site restoration requirements were identified. A Phase 1 Environmental Site Assessment and CEQA initial studies were also performed, and the construction schedule and cost estimate for each site was also updated.
Staff presented the latest alternatives evaluation to the Public Works Commission on June 2017, to request their recommended final selection. Staff then presented the same evaluations, plus the recommendation of the Commission, to the City Council in July 2017, and requested direction from Council on the final in-system storage facility site selection to proceed through final design.
On July 17, 2017, the City Council selected the San Mateo County Event Center for the location of the underground storage facility. The Event Center is near where the most sewer overflows have historically occurred, near the intersection of South Delaware Street and 25th Ave. The northeast corner of the property, where the RV Storage Lot is located, will be used for the facility.
2. Do similar underground storage facilities exist in other parts of San Mateo?
San Mateo does not currently have an underground storage facility; however, Daly City does, and Pacifica is planning to construct one. These storage facilities are becoming more widely used across the entire country as a means of providing additional capacity in the system during heavy rains to help prevent sanitary sewer overflows (SSOs).
3. What will the dimensions of the underground storage facility be?
The storage facility must be able to contain approximately 5.2 million gallons. The two alternative sites have different constraints that will affect the design and dimensions of the facility.
Approximate plan dimensions for the San Mateo County Event Center tank are 210 feet by 150 feet.
These approximate dimensions will change and detailed dimensioning of the facility will be defined as the design progresses.
4. What will be the environmental impact of this underground storage facility once it is constructed?
The Programmatic Environmental Impact Report (PEIR) contains summaries of potential environmental impacts. During construction, the impacts will be traffic, dust, noise, and vibration. Impact mitigation measures will be implemented during construction. Once constructed, the storage facility will help the City comply with the Regional Water Quality Control Board’s Cease and Desist Order to eliminate sanitary sewer overflows to the Bay and thus will improve water quality (a beneficial impact). Once construction is complete, the site will be restored to its previous condition with potential enhancements to surface improvements. Now that a site has been selected, additional environmental investigations will be conducted. This information will be shared with the public prior to construction.
5. What will happen to the 5+ million gallons of treated water following heavy rains?
The underground storage facility is designed to temporarily store wastewater only during peak wet weather events (heavy rains), and the wastewater that is stored in the facility is diluted with rain water. The diluted wastewater will be held, typically for no more than approximately 24 hours, until the storm passes and the downstream collection system and the treatment plant have sufficient capacity to accept more flows. Upon release of the stored diluted wastewater, the storage facility will utilize self-cleaning mechanisms to flush and clean the facility, all while odor control is in effect.
The new plant will treat the wastewater to higher treatment levels of quality that meet state requirements (Title 22) so it can potentially be reused for irrigation purposes. The City is exploring partnership options to treat the effluent to a higher level of quality for potential indirect potable recycled water use.
6. How much has seismology been factored into the site evaluation?
The final design is required and will meet seismic safety thresholds and standard building codes. The facility will be designed to withstand the U.S. Geological Survey (USGS) seismic acceleration of 1.9 g, which is specific to San Mateo. The design will also comply with governing codes, such as Reinforced Concrete ACI 350, California Building Code 2013, and Design Loads for Buildings and Other Structures (ASCE 7-10).
7. Will more taxes need to be paid to cover the cost of this underground storage facility, or is there another funding source? How will the construction of this underground storage facility be funded?
Taxes are not used to pay for this facility or any of the City’s sewer projects. The Clean Water Program is funded by sewer fees paid by property owners in San Mateo and through cost-sharing contributions from partner agencies, including the City of Foster City, Town of Hillsborough, County of San Mateo, and Crystal Springs County Sanitation District. The City is also applying for Clean Water State Revolving Fund low interest rate loans to minimize the impact of this multi-year capital improvement program on sewer rates. The City is proposing increases in sewer rates to provide the revenue required to pay for the Clean Water Program.
8. What is the cost estimate for the In-System Storage project?
The underground storage project is part of the Basins 2 & 3 Collection System Improvements Project. This project includes the underground in-system storage facility, several sewer pipe projects, and pump station rehabilitation/upgrade projects. The total cost of this project is estimated to be a $154 million capital investment.
On July 17, 2017, the City Council selected the San Mateo County Event Center for the location of the underground storage facility. The Event Center is near where the most sewer overflows have historically occurred, near the intersection of South Delaware Street and 25th Ave. The northeast corner of the property, where the RV Storage Lot is located, will be used for the facility. Now that site selection is complete, a detailed cost estimate is being developed for this location.
9. What will be done to maintain the soil structure? What will be the impacts of installing the large structure underground?
Geotechnical soil investigations will be completed as part of the design. Construction of the facility will require excavation of the soil and shoring will be utilized to maintain the integrity of the excavation. The foundation for the facility will likely require piers to support it.
10. How will this underground storage facility keep the City of San Mateo in compliance with local, State, and federal environmental requirements?
In 2009, the San Francisco Bay Regional Water Quality Control Board (RWQCB) issued a Cease & Desist Order to the City mandating the elimination of sanitary sewer overflows and provide capacity assurance. The permit that allows us to discharge treated water to the San Francisco Bay (which is the Environmental Protection Agency’s 2013 National Pollutant Discharge Elimination Service [NPDES]) requires us to eliminate blending and use an integrated approach to collect and treat the wastewater.
The underground storage facility will allow us to temporarily divert excess volumes of wet weather wastewater flows (during heavy rains) until the capacity of both the collection system and the wastewater treatment plant can accept the stored diluted wastewater for appropriate conveyance and treatment. This will allow the City of San Mateo to comply with the RWQCB’s and EPA’s regulations.
1. Why is this year’s large sewer rate increase necessary?
The City has a 100% volumetric-based rate structure, which is based on water use. With the drought-induced decline in water consumption in the past two years, sewer revenues have also declined. Revenue has been approximately 24% lower than projected. This shortfall means that the City is not bringing in the revenue necessary to stay on track to improve, operate, and maintain the wastewater system.
This reduction in revenue also comes at a time when the City is facing the financial needs of a large capital improvement program to rebuild the wastewater treatment plant and make major upgrades to the sewer collection system to meet State regulatory requirements. The proposed 36% increase to the base rate for fiscal year 2017-18 will establish sufficient revenue to overcome the shortfall and provide reliable future revenue for financing the major capital improvements.
Specifically, the proposed rate adjustments will enable the City to:
- Fund capital investments and debt service for high-priority capital needs in Fiscal Year 2017-18. These high-priority capital projects include improvements to the sewer collection system and the wastewater treatment plant (WWTP), including annual sewer rehabilitation, capacity, and reliability improvements and projects at the WWTP to ensure responsive and functional facilities.
- Respond to increased regulatory requirements and issues associated with sanitary sewer overflow prevention, including construction of relief sewer lines and facilities necessary to prevent overflows during heavy rains, as well as increased cleaning, inspection, and rehabilitation of the existing collection system.
- Pay for the increases in annual operating and maintenance expense required to meet the City’s regulatory permit requirements, fund increasing annual debt service requirements, and keep revenues aligned with the costs of providing wastewater service.
2. What happens if we do not raise the rates and do not do these improvements?
Not completing the capital improvements will lead to the City failing to comply with the Regional Water Quality Control Board’s Cease and Desist Order and the National Pollutant Discharge Elimination System permit requirements. Not meeting these regulatory requirements and mandated deadlines could result in large fines that will be passed on to ratepayers. Our infrastructure will continue to deteriorate and will continue to have failures, such as sanitary sewer overflows that leak diluted raw sewage onto the streets and pollutants into the City’s creeks, beaches, lagoon, and San Francisco Bay. Sanitary sewer overflows are significant health concerns that negatively impact the community and the environment.
3. How are sewer improvements, operations, and maintenance paid for?
The sewer utility is a self-supporting enterprise that relies mostly on sewer service charges to fund the costs of providing service. The City has provided financial stewardship by gradually raising sewer rates to keep rates in line with annual revenue requirements. Revenue is used to fund operating expenses, maintenance, rehabilitation, and capital improvement projects. The Clean Water Program is funded by sewer use fees paid by all properties and neighboring jurisdictions (Town of Hillsborough, Crystal Springs County Sanitation District, County of San Mateo, and City of Foster City) that tie into the sewer collection system and send flows to the treatment plant. All users and contributors to the wastewater system pay their fair share of the costs.
4. How much does the program cost?
The Clean Water Program is a $900 million capital improvement program that will be constructed over the next several years.
5. What is the City doing to minimize the cost to ratepayers?
The City is seeking grants, low-interest loans, and other financing mechanisms to minimize impacts on sewer rates. The City is aggressively pursuing sizeable State Revolving Fund loans for a majority of the program costs.
6. What is our current sewer rate? What will it be increased to?
The City’s current residential sewer rate is $9.05 per hundred cubic feet (CCF) of billed usage. With a 36% increase, the residential rate increases to $12.31 per CCF. For reference purposes, 1 CCF equals 748 gallons. Any rate increase would be applied across the board to the residential and commercial rate classes, plus the minimum charge as well.
7. Do commercial rates go up as well? By how much?
Yes, the commercial rates will go up by 36%, as well. The City levies volumetric commercial sewer rates that vary by customer class and wastewater strength, with higher rates charged to customer classes with higher-strength wastewater. Higher-strength wastewater contains higher concentrations of “contaminants” that cost more to treat to permitted levels prior to disposal. The City has four commercial rate classes. All sewer accounts, including commercial accounts, are subject to a minimum charge, which will increase from $22.62 to $30.78 per month. Commercial sewer rates are currently 100% volumetric, with no fixed charge component. However, the minimum charge does ensure all accounts pay at least a minimum amount toward the City’s fixed operating costs even if they have very low usage.
8. How are sewer bills calculated?
There are two components needed to calculate your sewer bill. The first component is the sewer “rate,” which is determined by the City determination of revenue requirements needed to improve, operate, and maintain the wastewater system. The second component is “usage.”
Your average monthly usage for the entire year is determined based on your average monthly winter water usage for the five preceding winter months (November through March). These five months are used as the basis because water use during these wetter, winter months excludes most outdoor landscape irrigation and more accurately reflects actual wastewater discharge.
Your monthly sewer service charge is calculated by multiplying the sewer rate for your customer class, by your average monthly usage. To determine your annual sewer charge, you multiply your average monthly sewer charge by the 12 months of the year. An example is provided below.
|Example||Nov 2016||Dec 2016||Jan 2017||Feb 2017||Mar 2017||Total|
|Water Consumption in CCF||7||5||4||4||5||25|
* 1 CCF = 100 cubic feet, or 748 gallons
Annual Sewer Charge = Rate X Average Monthly Use X 12 Months
Using the example data above, the steps to calculate the annual charge for a “Class A Standard” residence are as follows:
1. To calculate your average monthly winter water use, take the total water consumption (25 CCF) and divide it by the 5 winter months:
25 CCF total winter water usage ÷ 5 months = 5 CCF average monthly water usage
2. Calculate the monthly fee by multiplying your average monthly water usage by the Class A rate:
5 CCF average monthly usage x $12.31 per CCF = $61.55 per month
(For commercial businesses, use the rate for your customer class, which reflects the cost of treating different strengths of wastewater.)
3. Next, calculate your annual sewer service charge by multiplying the monthly sewer charge by the 12 months of the year:
$61.55 per month x 12 months = $738.60 annual sewer service charge
Note: The proposed minimum charge for Fiscal Year 2017/18 is $30.78 per month. This minimum charge will apply if there is any water use during the fiscal year.
9. What will the new charge be for a “typical” household?
As illustrated in the following chart, the monthly sewer service charge for a typical home with 5 hundred cubic feet (CCF) of average monthly winter water use is currently $45.25. With the proposed 36% increase, the typical monthly charge would increase to $61.65.
Households with lower-than-average water use--for example, those with 3 CCF of average winter water use--currently pay $27.25 monthly and will see their bills increase to $36.93 per month.
10. How do the City’s sewer rates compare to other agencies?
The City’s sewer service charges for a typical home are low compared to other regional agencies. In particular, low-use customers pay substantially less in San Mateo than they do in other surrounding communities. With the proposed rate increase, the City’s sewer charges for a typical home are projected to remain in the lower-middle range, and sewer charges for low-use customers will remain low compared to other regional agencies.
The chart below shows today’s rate compared with the rate after the proposed increase. The City’s monthly sewer charge for a typical single family home is at the low end of the range compared to 22 regional sewer agencies. Even with the 36% rate increase, San Mateo will be in the middle of the rates relative to those charged by the surrounding communities. The sewer fee data from the other agencies shown in the chart reflects their current rates for the last fiscal year. Note that many of these agencies are also undergoing rate increase processes, and those future charges are not reflected in this chart. When other agencies raise their rates, San Mateo’s rates will again be relatively lower than most surrounding communities.
11. When were rates last raised? What was the percent?
In Fiscal Year 2015-16, rates were increased by 10%. Last year (2016-17), the rates were raised by 12%. Due to water conservation efforts, many customers have reduced their water usage, resulting in a total reduction in sewer service charges of 24% over the past two fiscal years. Because of this decrease in billed usage, sewer rate revenues have decreased despite the sewer rate increases over the past two years. It is important to note that on average, while rates went up, sewer bills have remained virtually the same for customers who have conserved because their billed usage has decreased.
12. When would the new rates become effective?
If the rates are adopted by the Council in June, they would go into effect 30 days later and be applied to Fiscal Year 2017/18 beginning July 1, 2017. The City’s sewer charges are billed on the County’s property tax bill, which is typically distributed by the County in October each year.
13. What can I do to keep my future sewer bill low?
Because your sewer rates are linked to your water use, conserving water in your home is one way to keep your sewer bill down. Unlike some communities where sewer bills are paid as a flat fee, the City of San Mateo’s sewer bill is currently 100% volumetric. This means the more you use, the more you pay. Although the City does not sell water directly to users, the City supports water conservation efforts by all rate payers. CalWater, one of the primary water providers in the area, has resources and a webpage on conservation tips you might find useful. The link to their Conservation Efforts page is https://www.calwater.com/conservation/.
14. How is the City engaging and educating the public about the Clean Water Program and its sewer improvements?
Public outreach and transparency are important components of the City and the Clean Water Program. The City of San Mateo Public Works Department hosts community meetings and reaches out to neighborhood and community organizations when important topics that affect the community need to be communicated. In addition, the program’s website, CleanWaterProgramSanMateo.org, has numerous project documents, presentations, and videos posted to inform and educate the community.
When new information or meeting invitations need to be communicated to the public, the Clean Water Program distributes information via first-class mailers, email notification (sign up on the Clean Water Program website), social media posts (via NextDoor, Facebook, Twitter), website updates, association newsletters, City Calendar updates, and/or press releases. The press releases allow the City to engage with local media sources, such as the San Mateo Daily Journal, to share topics related to the City’s Clean Water Program.
15. What if people continue to conserve?
With the current 100% volumetric sewer charge structure, sewer charges are greatly affected by the unpredictability of average winter water usage. Ideally, sewer rate increases should result in proportional raises in sewer service charges and recovered revenue. If the average usage continues to decline, the actual revenue recovered will continue to be short of the target revenue needs, as has been the case over the past few years. An example of the effects of continued decrease in usage and the impacts to sewer bills is provided below. Although rates were increased, the sewer bills, which provide the City revenue to fund the improvements, operations, and maintenance of the wastewater system, essentially decreased in this example.
To improve the predictability and stability of future revenue recovery, the City is evaluating a move toward a more predictable rate structure, such as a hybrid structure that continues to have a volumetric-based fee but introduces a fixed-fee component.
16. I live in a new development with new pipes. Why are we being asked to pay to upgrade all the old pipes?
The City’s sewer collection and treatment system works to serve all residents of the City and, as a whole, to meet regulatory requirements. The sewage from any new development is conveyed to the wastewater treatment plant within this overall sewer system. The City operates and maintains the overall sewer system, which includes newer sewer lines that are constructed in new developments. The sewage from these developments goes though the same overall conveyance system, which is currently impacted by a Cease and Desist Order from the Water Board for sanitary sewer overflows during wet weather. The Water Board makes no distinction of location in the negative issues affecting the conveyance system. Likewise, the WWTP is currently impacted by a requirement to eliminate blending of partially treated wastewater during wet weather events through the City’s NPDES discharge permit. Any flow that enters the sewer system contributes to the entirety of the system and is not seen nor treated any differently. So, no one person or area is exempt from making improvements to the entirety of the system as it operates as one for the good of all.
Capital needs vary from time to time and place to place within the system, and all property owners in the City’s sewer collection systems have paid for the system’s maintenance in common in the past, and will continue to do so in the future. We expect this to even out over time so that property owners who arguably “benefit” from the system-wide rate structure now will be “burdened” later, when their segment of the system does not need repairs but other segments do. Furthermore, a system-wide rate structure provides greater transparency and ease of administration over a rate structure based on near-term maintenance needs.