San Marino water and sewer rates
Who supplies water to San Marino houses, what it costs, and how the sewer charge works.
California American Water (San Marino system)
California American Water, Southern Division Schedule SOU-1: a $25.95 monthly service charge for a 5/8 x 3/4-inch meter and residential quantity rates per 100 gallons for the first 85, next 50, next 163 and over 298 hundred gallons a month, purchased water and power surcharges of $0.0680 and $0.0029 per 100 gallons from July 1, 2026, two 12-month surcharges of $0.0096 and $0.0027 per 100 gallons from July 1, 2026, and a 1.111% City of San Marino franchise fee surcharge.
| Use a month | Price per 1,000 gallons |
|---|---|
| Fixed charge | $26.24 a month |
| 0 to 8.5 thousand gallons | $7.57 |
| 8.5 to 13.5 thousand gallons | $8.69 |
| 13.5 to 29.8 thousand gallons | $9.67 |
| 29.8 to more | $10.79 |
- Source
- Mostly groundwater from San Marino wells (77%), plus water bought from the Metropolitan Water District (23%, MWD Weymouth).
- Standards
- California American Water says the San Marino system's water met state and federal drinking water requirements in 2025.
- Hardness
- Total hardness averaged 113 ppm (6.6 grains per gallon) in the San Marino wells and 234 ppm (14 grains) in the MWD Weymouth supply.
- Chromium 6
- Hexavalent chromium was not found above the limit; the company says it is working on treatment to comply with the limit by October 1, 2026.
Sewer
The City of San Marino sewer service charge is $321.36 per sewer unit for fiscal year 2026-27; it is placed on the Los Angeles County property tax roll.
Sources
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.