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Read by an AI agent (a large language model) from the utility's official rate schedule.
Service charge (5/8 x 3/4 - inch meter meter): $35.24/mo Water used, 6,000 gal: $60.57/mo Required water fees and surcharges: $15.99/mo Total: $111.79/mo
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Utility profile · CA
CALIFORNIA WATER SERVICE - SAN MATEO supplies water to about 100,000 people in San Mateo, Highlands, and Baywood Park, California. A typical household using 6,000 gallons a month pays an estimated $111.79, 92% above the national average.
Rates effective 2026-10-01
Updated Oct 2026
$95.80 water + $15.99 required fees ⓘ
| Service charge 5/8 x 3/4 - inch meter |
$35.24 |
| Water used 6 ccf × $4.3026/ccf |
$25.82 |
| Water used 2.021 ccf × $17.1918/ccf |
$34.75 |
| Required fees and surcharges | $15.99 |
| Total | $111.79 |
Monthly cost (6k gal) vs up to 10 nearest utilities with published rates. Click to navigate.
Population served and the municipalities covered by this utility's service area.
Boundaries from the EPA Water System Service Areas dataset. Not all utilities have mapped boundaries.
Municipalities served
Supply and provider classification from EPA records.
Named intake/well source and interconnections (who this utility buys from or sells to) aren't captured yet — tracked separately for a future update.
Annual bill as a share of median household income in the service area.
We don't yet systematically track whether a utility offers income-based or sliding-scale pricing separate from its standard rates — tracked separately for a future update.
This rate was extracted from CALIFORNIA WATER SERVICE - SAN MATEO's published tariff document by an AI research agent, then checked against a validation checklist before publishing. See the full methodology for how every utility on this site is sourced and scored.
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