Clayton water and sewer rates
Who supplies water to Clayton houses, what it costs, and how the sewer charge works.
Contra Costa Water District (CCWD)
CCWD treated water rates effective February 1, 2026: a service charge of $1.01 a day for a 5/8 inch meter, a usage charge of $6.98 per unit (one hundred cubic feet, HCF) and an energy charge of $0.13 per unit in Zone 1, rising to $2.37 in Zone 8; the energy zone is listed on your bill. Treated water meters are normally read bimonthly
| Use a month | Price per unit (CCF, 748 gallons) |
|---|---|
| Fixed charge | $30.72 a month |
| 0 to more | $7.11 |
- Source
- Nearly every drop of CCWD's water comes from the Sacramento-San Joaquin River Delta; water stored in Los Vaqueros Reservoir can be blended with Delta water.
- Lead
- CCWD's service line inventories detected no lead service lines in CCWD systems.
- PFAS
- CCWD has tested for PFAS and has not detected these compounds in its drinking water.
- Standards
- In 2025 the water CCWD delivered exceeded every drinking water standard set by the state and federal governments.
Sewer
The Clayton residential sewer charge is on the annual property tax bill as CLAYTON RES SEWER.
Other charges on the utility bill
- Street sweeping charge on the Republic Services statement: $1.00 a month
Ways to pay less
- Low-income seniors 58+ or disabled: CCWD Lifeline rate. CCWD's lifeline water rate program cuts the daily service charge by 50% for low-income customers over 58, or receiving permanent Social Security disability benefits. A one-person household qualifies with income under $59,400 and a two-person household under $67,900 (as of May 2026). How: Fill out the Lifeline Water Rate Application Form and mail it to CCWD's Lifeline Program, P.O. Box H20, Concord, CA 94524; questions: 925-688-8000.
- CCWD Lawn to Garden rebate. CCWD pays $1 per square foot of lawn replaced with water-wise landscaping, up to $2,000 for a single-family home; front and back yards qualify, and at least 300 square feet must be converted. How: Apply to CCWD before starting: projects underway or completed before CCWD approval are not eligible.
Pay or manage it
Sources
- CCWD Code of Regulations Title 5: water supply and rates
- CCWD: 2025 water quality report
- CCWD 2025 and 2026 water rate study
- CCWD: Lawn to Garden rebate
Checked October 22, 2026. Every number here comes from the public sources listed, matched by our checker.
Rates change every year; this page shows when it was last checked. Nothing here is legal, tax or insurance advice.