San Dimas

Overview May 29, 2020

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.

Post June 1, 2022

Conservation

Following several years of heavy precipitation and snow in California, conditions have dramatically changed for many parts of the State. In response, the state has rolled back drought emergency provisions that are no longer needed while maintaining other measures supporting regions and communities facing water supply challenges.

Effective Sunday, May 14, 2023, Golden State Water Company modified outdoor watering restrictions to allow 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

Post May 29, 2020

Rates

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. New rates allow for investments to avoid the costly and sometimes dangerous effects of deferring maintenance or delaying the replacement of aging infrastructure.

2026 General Rate Case (2028-30 Rates)

In July 2026, Golden State Water Company (Golden State Water) will file its 2026 General Rate Case (GRC) application with the California Public Utilities Commission (CPUC). The application proposes water rates and infrastructure investments for 2028, 2029 and 2030.

These rates reflect Golden State Water’s long-term commitment to providing customers with high-quality water and reliable service by proactively investing in their community’s water supply and distribution systems. We never want customers to think twice about the quality of the water coming from their taps.

To learn how your rates are invested in your community, visit the Capital Projects tab, and for frequently asked questions about the rate-making process, click here.

Water Systems: San Dimas, South Arcadia

The average residential customer in the San Dimas Customer Service Area with a 5/8 x 3/4” meter using 8,976 gallons (12 Ccf) per month would see their current monthly bill increase from $95.81 to $107.87 in 2028, at the earliest (excluding any applicable surcharges).
The average commercial customer in the San Dimas Customer Service Area with a 2″ meter using 67,320 gallons (90 Ccf) per month would see their current monthly bill increase from $942.41 to $1095.11 in 2028, at the earliest (excluding any applicable surcharges).

Rates/Infrastructure Investments

About Golden State Water Company

Tariff Sheets

Financial Assistance

Low Income Assistance

Maps

System Map - San Dimas

Post June 2, 2020

San Dimas Rebates

San Dimas CSA

Post May 29, 2020

Capital Projects

2026 General Rate Case (2028-30)

The rates proposed for 2028-2030 will provide customers in the San Dimas Service Area with long-term value by investing nearly $43 million in local water infrastructure essential to delivering safe, high-quality, and reliable drinking water.

Proposed investments include replacing Artesia Well No. 3, Highway Well No. 1, and Malone Well No. 1, constructing a new 2-million-gallon buried reservoir and booster station at the Cienega Yard Plant, upgrading critical electrical infrastructure at key facilities throughout the system, and installing tank mixers and reservoir improvements to enhance water quality and storage reliability. These projects, combined with ongoing pipeline replacements throughout the service area, will improve water quality, strengthen groundwater supply reliability, reduce reliance on purchased water, and extend the life of critical water infrastructure. Together with the company’s ongoing investments in water treatment technology and fire hydrants that support public safety, new investments will help maintain safe drinking water standards and reliable service for the community.

For frequently asked questions about the rate-making process, click here.

Learn about the infrastructure investments in the water system serving your community’s homes and businesses:

Current & Upcoming Projects

300 North Walnut Avenue – Construction of Water Mains, Hydrants and Domestic Services

Location:
300 North Walnut Avenue – Tract 73584, San Dimas, CA 91773

Project Timeline:
May 2026 – August 2026

Working Hours:
Monday – Friday (No work on weekends or holidays)
7:30 a.m. – 4:30 p.m.

Construction crews will work to:

Construct the 620 LF of 8” and 10” PVC Watermains, 12-1”
Domestic Services, 3-6” Fire Hydrants and Abandonment of 1-1”
Domestic Service and 1-6” Fire Hydrant.

This project will ensure Golden State Water can continue providing reliable water service to local customers.

View the Construction Notice here.

La Verne – De Anza Heights Road Pump Station Project

Location:
790 ½ De Anza Heights Road-Pump Station-Tract 53984, La Verne, CA 91750

Project Timeline:
May 2026 – February 2027

Working Hours:
Monday – Friday (No work on weekends or holidays)
7:00 a.m. – 5:00 p.m.

Construction crews will work to:

Construct a booster station with four pumps, CMU walls, phase electrical service, suction and discharge piping.

This project will ensure Golden State Water can continue providing reliable water service to local customers.

View the Construction Notice here.

Wayhill Plant – East and West Reservoir Replacement

Location:
Wayhill Plant – 506 Gladstone Ave., San Dimas, 91773