Golden State Water provides reliable, high-quality drinking water to approximately 11,000 customers in the Claremont Customer Service Area (CSA), which includes Claremont and portions of Montclair, Pomona and Upland. Our local team includes 11 dedicated employees who take pride in serving Claremont customers 24/7.

Local water comes from two sources:  60 percent comes from local groundwater supplies, which Golden State Water maintains, and the balance is imported from the Metropolitan Water District of Southern California (MWD) via Three Valleys Municipal Water District.



Following several months of storms bringing much-needed snow and rain to California, conditions have dramatically changed for many parts of the State. In response, Governor Newsom has rolled back some drought emergency provisions that are no longer needed while maintaining other measures that support regions and communities still facing water supply challenges.

Effective Sunday, May 14, 2023, Golden State Water Company modified outdoor watering restrictions to allow for watering up to three days per week. Given that water conditions will continue to evolve, customers are encouraged to use water wisely and only use what is needed.

Golden State Water is recommending customers limit outdoor irrigation between the hours of 7 PM and 8 AM per the following schedule:

Addresses Ending In: Watering Days:
Even Numbers (0, 2, 4, 6, 8) Sunday, Wednesday, Friday
Odd Numbers (1, 3, 5, 7, 9) Tuesday, Thursday, Saturday


As a regulated utility, Golden State Water’s rates are determined by the California Public Utilities Commission (CPUC) through a General Rate Case (GRC) to ensure customers receive a fair rate for reliable, quality water service.

Effective July 31st, 2023, the California Public Utilities Commission approved the 2020 GRC which includes new rates to ensure the safety and dependability of your local water system. The new rates allow for investments to avoid the costly and sometimes dangerous effects of deferring maintenance or delaying the replacement of aging infrastructure. Click here to learn more. Learn more about the rate-making process and localized information on new rates and investments in the Claremont GRC Fact Sheet.

The average residential customer in the Claremont Customer Service Area with a 1” meter using 13,464 gallons (1,800 cubic feet or 18 Ccf) per month will see their monthly bill increase from $119.76 to $134.02 (excluding any applicable surcharges).

The average commercial customer in the Claremont Customer Service Area with a 5/8 X 3/4” meter using 49,368 gallons (6,600 cubic feet or 66 Ccf) per month will see their monthly bill increase from $301.20 to $335.09 (excluding any applicable surcharges). 

As required by the CPUC every three years, in August of 2023, Golden State Water Company filed its 2023 General Rate Case (GRC) with the California Public Utilities Commission. This rate plan proposes local infrastructure investments and water rates for the years 2025, 2026 and 2027. Any adjustments to current rates will not go into effect until January 2025, at the earliest. Click here to learn more.

  • On July 15, 2020, Golden State Water filed a GRC application for the years 2022, 2023 and 2024. Learn more: 2022-24 GRC Fact Sheet
  • Effective Sept. 27, 2019, an average residential customer in the Claremont Customer Service Area would see a monthly bill increase of $0.007 per 748 gallons (1 Ccf), or approximately 0.1 percent, during the 12-month amortization period.
  • Effective June 8, 2019, an average residential customer in the Claremont Customer Service Area with a 1” meter using 18 Ccf per month would see a monthly bill decrease of $1.66 from $108.23 to $106.57 compared to 2018 (excluding any applicable surcharges).
  • On May 30, 2019, Golden State Water’s GRC was approved by the State of California to set water rates for 2019, 2020 and 2021 and authorize infrastructure investments for the local system. New rates were implemented effective June 8, 2019. Learn more here. (EnglishSpanish)
  • On July 1, 2018, local water rates decreased by 3.21% to pass cost savings from the new lower federal corporate income tax requirement through to customers. Click here to learn more.

​Learn More

Understanding Your Tariff Sheet

Review All Rates, Tariffs and Advice Letters


Capital Projects

The General Rate Case approved June 29, 2023 invests over $15 million in the Claremont Customer Service Area. The new rates are being invested in your service area’s reservoir interior coating, new booster pumps, cathodic protection systems, and backup power equipment.

The 2022 investments include water supply enhancements, distribution and ongoing improvements designed to replace old meters, mains and safety equipment. Click here to learn more and access a list of projects planned for 2022.

Current & Upcoming Projects

Recently Completed Projects

outline of the Pomello Plant Project

Pomello Plant
928 E. Pomello Drive

$1.9 million

Project Timeline:
(delayed due to COVID-19) October 14, 2019 – May 2021

Working Hours:
7 a.m. – 5 p.m.

Construction crews will work to construct a new groundwater well.

This project will provide a new groundwater source for the local water system and ensure Golden State Water can continue providing reliable water service to local customers.

Click here to learn more.

View the construction notice to learn more.

outline of Part 1 of Yale Avenue Project

Yale Ave.


Construction crews worked to:

  • Replace approximately 3,600 ft. of aged water pipe
  • Install new service lines
  • Install fire hydrants

Part 1: 1st St. to Harrison Ave.

Project Timeline:
June 6, 2017 – mid-July 2017

View the construction notice.

outline of Part 2 of Yale Avenue Project

Part 2: Harrison Ave. to 7th St.

Project Timeline:
Mid-July 2017 – August 25, 2017

View the construction notice.

Foothill Blvd. between Towne Ave. and Mountain Ave.

Project Timeline:
March 28, 2017 – end of April 2017

outline of Foothill Boulevard Project

Working Hours:
7 a.m. – 5 p.m.

Construction crews worked to:

  • Upgrade a fire hydrant
  • Install new service line

View the construction notice.