San Dimas

San Dimas


Golden State Water has proudly served the San Dimas Customer Service Area since 1976. With more than 16,000 customers, Golden State Water serves residents in portions of Charter Oak, Covina, Glendora, La Verne, San Dimas and Walnut. This location has 13 local employees serving customers 24/7.

Water delivered to customers is a blend of groundwater pumped from the Main San Gabriel Basin and purchased water from the Metropolitan Water District of Southern California and 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 San Dimas GRC Fact Sheet.

The average residential customer in the San Dimas Customer Service Area with a 5/8 x 3/4” meter using 10,472 gallons (1,400 cubic feet or 14 Ccf) per month will see their monthly bill increase from $74.45 to $84.71 (excluding any applicable surcharges).

The average commercial customer in the San Dimas 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 San Dimas 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 San Dimas Customer Service Area with a 5/8 x 3/4” meter using 13 Ccf per month would see a monthly bill decrease of $1.26 from $63.99 to $62.73 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 $11 million in the San Dimas Customer Service Area. The new rates are being invested in your service area’s new wells, new reservoirs, 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

Project map

Baseline Well No. 5
636 East Baseline Road, in the City of San Dimas 


Project Timeline:
October 5, 2020 – January 2021

Working Hours:
Monday – Friday 8 a.m. – 5 p.m.

Construction crews will work to:

  • Destroy the existing water well at Golden State Water Company’s Baseline Plant
  • Drill and develop new water well

View the Construction notice.

outline of Banna Avenue Project

800 N. Banna Ave. surrounded by Cypress St., Banna Ave., Kidder Ave., and Colver Pl.

Project Timeline:
January 9, 2017 – TBD

Working Hours:
7 a.m. – 4 p.m.

Construction crews will work to:

  • Install new water pipes
  • Install new service lines
  • Install fire hydrants

outline of Covina Project

Calora St. and Kinsella

Project Timeline:
May 15, 2017 – August 21, 2017

Construction crews worked to:

  • Replace aged water pipe
  • Install new service lines
  • Install fire hydrants

View the construction notice.