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Proposed Future Water Rates

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Over the last six months, the District and our water rate consultant have performed a cost-based review of our services and revenue requirements.  The District is proud to present rates that reflect some of the lowest water rates in the region while retaining the highest quality water in East Contra Costa County.  Under the proposed rates, 66% of the District's bills issued will see a bill decrease (single-family using 15 hcf or less).

Bill Comparison Chart

Bill Comparison

Prop 218 Notice


Why have I received this notice?

Diablo Water District is proposing new water rate schedules for fiscal years 2021/22 through 2026/27. Due to legal noticing requirements, you may have received more than one copy of the notice. The notice applies to all customers receiving water service from Diablo Water District.


Why is the District changing the water rate structure?

The District must ensure accurate cost recovery from the appropriate customer classes (single-family, multi-family, non-residential, etc.). Each customer class has unique customer demand profiles that impact the cost of providing water service. As customer demand profiles change over time and costs increase, the District must review its cost allocations to ensure a legal and equitable application of these costs. The District hired a rate consultant to perform the cost allocations associated with serving each type of customer class. The results of this cost-based study are reflected in the proposed rates.


Did the District increase rates in 2021?

No, in light of the pandemic and its impact on the economy and our customers, the Board of Directors voted to not increase rates in 2021. However, since the District's last increase (two years ago), externally-controlled costs have significantly increased.

  • Water treatment chemicals have increased by 74%.
  • Wholesale water costs have increased by 11%.
  • Pacific Gas & Electric have increased by 11%.


How were the new rates calculated?

The District hired a rate consultant to review our current water rates, future revenue needs, and the costs associated with serving each type of customer class. This resulted in a cost-based rate schedule that is unique for each water customer class based on how they impact the financial burden to the District.


Where can I read and review the rate study?

The final rate study can be viewed here.


What is the Service Charge?

The Service Charge covers fixed costs that are not covered by the Consumption Charge relating to providing service to each customer (e.g., meter reading, billing, customer service and administration) and a portion of the capital costs required to provide capacity needed by each customer (e.g., distribution system pipelines and storage).


What is the Consumption Charge?

The Consumption Charge covers costs primarily related to the volume of water used by District customers, such as operations and maintenance and capital improvements, some of which is directly relate to how much was used (e.g., the cost of water from CCWD) and some of which is fixed (e.g., personnel costs). The Consumption Charge varies depending on how much water is used each billing period.


Will I be affected?

95% of Diablo Water District customers are residential users. Our average residential customer uses 14 units per month. A majority of our single-family customer bills (those using 15 units or less) will see a bill reduction.


Does the District offer conservation assistance?

Yes, we offer customized conservation kits that we are happy to deliver to your door while our office remains closed to the public. We also offer many rebates, our largest being the lawn-to-garden rebate. Residential irrigation has the largest impact on the District's infrastructure and our customer's bills. Click here for more conservation information.


How can I support the proposed rate structure?

No action is necessary if you do not wish to protest the proposed rate structure. You are welcome to attend the hearing on January 26, 2022 to voice your support.


How can I protest the proposed rate structure?

Written protests may be provided by any District customer, or owner of property, by mail or hand delivery to the District office by 6:30 p.m. January 26, 2022. Written protests must be addressed to the District's Secretary, P.O. Box 127, 87 Carol Lane, Oakley, CA 94561. Each written protest must clearly identify the following:

    • Property or Account (by account number, assessor's parcel number, or street address) to which the proposed rates and charges would apply
    • Statement protesting the proposed rate adjustments (you do not need to include a reason why; opposition alone is sufficient)
    • Signature of the property owner or tenant

Protests received by telephone, facsimile, electronic mail (e-mail), or via social media sites, including, but not limited to, Facebook or Twitter, shall NOT be accepted.


What is the consequence of not adopting the new rate structure?

The proposed rate structure will allow the District to continue to operate in a fiscally and environmentally responsible manner while continuing to provide high-quality and safe drinking water to our customers. Failure to adopt the new rate structure will negatively impact the water supply reliability and general safety of our aging water system.  Climate-resilient efforts for earthquakes and protecting our groundwater aquifer are critical as well as planning for future drought years.

Water Rate Study Presentation Clips