RosemeadWhat a house pays

Rosemead water and sewer rates

Who supplies water to Rosemead houses, what it costs, and how the sewer charge works.

California American Water (San Marino system)

California American Water, Southern Division Schedule SOU-1 rates effective January 1, 2026 (its San Marino Service Area includes Rosemead): a $25.95 monthly service charge for a 5/8 x 3/4-inch meter plus 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 1.088% City of Rosemead franchise fee surcharge.

Use a monthPrice per 1,000 gallons
Fixed charge$26.23 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$9.66
29.8 to more$10.79
Source
Mostly groundwater from the Main San Gabriel and Raymond Basins (77% from San Marino wells), plus water bought from the Metropolitan Water District (23%).
Standards
California American Water says the San Marino system's water met state and federal drinking water requirements in 2025.
Hardness
Total hardness (as CaCO3), 2022 and 2025 sampling: 113 ppm (6.6 grains per gallon) in the company's own wells and 234 ppm (14 grains) in water bought from Metropolitan.
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.

Golden State Water (South San Gabriel system)

Golden State Water Company, Region 3 residential rates (Schedule R3-1-R, effective January 1, 2026; its territory includes portions of Rosemead): a monthly service charge by meter size plus three tiers per 100 cubic feet, a $0.147 per Ccf CAP surcharge, a $0.0060 per Ccf surcharge for 12 months from April 3, 2026, and a 0.7% surcharge on all bills.

Use a monthPrice per unit (CCF, 748 gallons)
Fixed charge$37.02 a month
0 to 12 units$5.11
12 to 44 units$5.85
44 to more$6.71
Source
Treated groundwater pumped from the Main San Gabriel Basin.
Hardness
Hardness averaged 240 mg/L (14 grains per gallon) in 2025, range 189 to 310.
Lead pipes
Golden State Water's service line inventory found no lead or galvanized service lines that need replacement.

San Gabriel Valley Water Company (El Monte/Whittier system)

San Gabriel Valley Water Company, Los Angeles County Tariff Area conservation rates for metered residential customers (its territory includes portions of Rosemead): a monthly service charge plus three tiers per Ccf, the Schedule LA-AS surcharges per Ccf, a $4.45-a-month sur-credit for customers not formerly served by the City of Montebello's water system, and a 0.70% surcharge to fund the Public Utilities Commission.

Use a monthPrice per unit (CCF, 748 gallons)
Fixed charge$28.53 a month
0 to 10 units$5.50
10 to 20 units$6.23
20 to more$7.91
Source
Except in its Whittier/Santa Fe Springs area, the company's 2025 water was groundwater from the Main San Gabriel Basin.
Standards
The company says the water it supplied in 2025 met all state and federal drinking water standards.
Lead pipes
Its service line inventory found no lead or galvanized service lines requiring replacement.

Sewer

LA County Consolidated Sewer Maintenance District sewer service charge: $78.50 per sewage unit for July 2026 to June 2027 (a single-family home is one sewage unit), collected on the property tax roll.

Ways to pay less

  • Low-income households: California American Water discount. Qualifying low-income California American Water customers can get a discount on their water bill once accepted into the company's low-income program. How: Apply with California American Water.
  • Low-income seniors over 62: Safe, Clean Water parcel tax exemption. Owners over 62 who live in the home and head a low-income household can apply for an exemption from the Safe, Clean Water Program special parcel tax; the FY 2027-28 limit is $106,600 for a 2-person household. How: Submit the claim form to the Safe, Clean Water Program by May 1 each year; call 833-275-7297.
  • Low water use: reduced sanitation district charge. District No. 15 parcels with significantly lower water usage may be eligible for a reduced service charge; dischargers with verified low water usage, particularly seniors and retirees, may qualify. How: Apply to the Sanitation Districts' low water rebate program.

Dates

WhenWhat
May 1, 2027Deadline for low-income seniors to apply for the Safe, Clean Water Program parcel tax exemption for FY 2027-28.

Pay or manage it

Sources

  1. Golden State Water Schedule R3-1-R
  2. San Gabriel Valley Water Co. Schedule LA-1C
  3. LA County Public Works: sewer maintenance
  4. LA County Consolidated Sewer Maintenance District FY 2026-27 report (Board letter)
  5. California American Water Schedule SOU-1 (Southern Division)
  6. California American Water San Marino rate change notice (2025)
  7. California American Water San Marino 2025 water quality report
  8. Golden State Water Schedule UF
  9. Golden State Water: San Gabriel
  10. Golden State Water South San Gabriel water quality report
  11. San Gabriel Valley Water Co. Schedule AA-UF
  12. San Gabriel Valley Water Co. Schedule LA-AS
  13. San Gabriel Valley Water Co. 2025 Consumer Confidence Report
  14. LA County Public Works: sewer service charge rates
  15. LA County Public Works sewer annexation letter (sewage unit definition)
  16. Metropolitan Water District Resolution 9397 (FY 2026/27 tax rate)
  17. Upper San Gabriel Valley Municipal Water District
  18. LA County Public Works Safe Clean Water tax layer description
  19. Safe, Clean Water Program: FY 2027-28 low-income senior exemption form
  20. Safe, Clean Water Program: tax appeal procedures and guidelines
  21. Metropolitan Water District FY 2026/27 water standby charge resolution
  22. LA County Public Works Safe Clean Water tax layer: median Rosemead single-family tax

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.