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Rates and Resources

Diablo Water District is a not-for-profit public agency run by local elected officials. All revenues received by the District are used exclusively to enhance and sustain our water system. This includes ongoing operations, maintenance, and critical infrastructure upgrades such as water main replacements and reservoir rehabilitations.

Your water bill includes a Water Usage Charge, determined by your water usage, and a Service Charge to cover the fixed operational costs of our water system.

 Residential Water Usage Charge*:

  • Tier 1: 0-6 units $4.37 per unit
  • Tier 2: 7-14 units $6.04 per unit
  • Tier 3: 15-22 units $8.32 per unit
  • Tier 4: 23+ units $9.91 per unit

1 Unit = 100 cubic feet or 748 gallons
*Single-Family Volumetric Rates effective 8/1/2025

Monthly Service Charge:

  • 5/8-inch meter = $24.31 (typical home)
  • 1-inch meter = $60.76
  • 1½-inch meter = $121.52
  • 2-inch meter = $194.43
  • 3-inch meter = $425.32

To view the complete list of District commercial and business rates, please refer to Regulation 1 and Regulation 6.

                                     Customer Resources

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Water Rate Study 

We are committed to providing you with a reliable and resilient water supply while maintaining transparency about our rates. We encourage you to learn more about water rates and the services we provide. By staying informed and using water efficiently, you can make a significant difference on your monthly bill.

Other Charges 
  • Application Fee: $30 charged to customer's first bill.
  • Call Out Charge: $300 to connect or disconnect water service after 4 p.m., on weekends, and on District-observed holidays.
  • Backflow Charge: $7.61 (3/4 to 1-inch) Monthly charge based on the size of the device being checked. For a full list of service charges, please click here.
  • Delinquent Notice Fee: $10 upon mailing of this notice.
  • Delinquent Notice - Door Tag: $30 if payment is not made by close of business the Monday before turn-off day.
  • Late Charge: 7% of balance not paid by delinquent date.
  • Returned Item Charge: $30 per unpaid item returned from bank.
  • Security Deposit: $100 for owners and $200 for tenants, or twice the estimated monthly bill, whichever is greater.
  • Tampering With Locked Service: $175 plus damages.
  • Trip Charge: $35 per trip to notify customer of disconnection, disconnect service for non-payment, or to reinstate service.

 

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