San Mateo water and sewer rates
Who supplies water to San Mateo houses, what it costs, and how the sewer charge works.
California Water Service (Bay Area Region, San Mateo)
Cal Water Schedule BAR-1-R single-family residential rates: a service charge of $34.47 per month for a 5/8 x 3/4-inch meter plus $4.2083 per CCF for 1-6 CCF, $16.8152 for 7 to 9, $21.0842 for 10 to 13 and $25.2184 over 13.
| Use a month | Price per unit (CCF, 748 gallons) |
|---|---|
| Fixed charge | $34.47 a month |
| 0 to 6 units | $4.21 |
| 6 to 9 units | $16.82 |
| 9 to 13 units | $21.08 |
| 13 to more | $25.22 |
Sewer
The City of San Mateo's sewer charge is on the annual property tax bill: a $67.68 per-dwelling-unit fee a month plus $13.28 per CCF of estimated annual water use for 2026-27; the city's calculation using 84 CCF of annual usage is $1,927.68.
Pay or manage it
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.