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.



Golden State Water has activated its Staged Mandatory Water Conservation & Rationing (Schedule 14.1) filings that outline restrictions, water allocations, enforcement measures and surcharges designed to achieve reductions due to water supply shortages or to achieve identified water usage goals established by an authorized government agency or official. 

The San Dimas community is in Stage 2 as of June 26, 2022. Under this stage, all outdoor irrigation is limited to two days per week. Outdoor irrigation is allowed only after 7PM and before 8AM, according to the schedule below.

Golden State Water customers who do not meet the Stage 2 mandatory 20% reduction in water use may be charged a drought surcharge of up to $2.50 per Ccf (or 748 gallons) for all usage in excess of the customer’s usage allocation. While Golden State Water is not currently implementing surcharges, we are closely monitoring water supply conditions and customer water usage and may implement surcharges if it becomes necessary to spur action and additional conservation.

Addresses Ending In Watering Days
Even Numbers (0, 2, 4, 6, 8)

Sunday, Wednesday

Odd Numbers (1, 3, 5, 7, 9)

Tuesday, 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.

  • 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

More than $6.2 million in infrastructure improvements are planned for 2022 in the San Dimas service area.

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.