Water Rates


Water treatment pipe with handle and tubing leading elsewhere.

Understanding Your Water Rates

Zone 7 is committed to providing safe and reliable water to our customers at a reasonable price.

We set water rates each year that allow us to take a proactive approach to protecting our water system, preparing for emergencies, replacing and upgrading equipment, and preventing system breakdowns in order to avoid service disruptions and increased costs for our customers.

How does Zone 7 set water rates?

To better understand your water rates, it helps to understand where your Zone 7 water comes from.

Approximately 70 percent of Zone 7’s water supply starts as snowmelt in the Sierra Nevada Mountains and is imported more than 100 miles to the Tri-Valley from the State Water Project through the Delta and South Bay Aqueducts.

Once that imported water arrives to the Tri-Valley, Zone 7 either stores it in the local groundwater basin for future or emergency use, or treats the water for delivery to four local water agencies – the City of Pleasanton, the City of Livermore, Dublin-San Ramon Services District or the California Water Service Company – that each then deliver it to customers as drinking water. These agencies are responsible for delivering the water to customers and sending water bills.

Water Service Rate Documentation

Treated WateR

Treated Water Service Rates for Calendar Years: 2019 – 2022

Following a public rate-setting process, the Board of Directors in a 4-3 vote approved a water rate increase for calendar years 2019 through 2022, subject to the Board revisiting the rates after two years. The overall annual increase is 6.7% per year. In 2020, the Board voted to postpone the scheduled rate increase.

Board Resolution No. 20-37
Board Resolution No. 18-74
Staff Report – Treated Water Rates

Treated Water Service Rates for Calendar Years 2017 – 2018

Board Resolution No. 16-172
Staff Report – Treated Water Rates

Rate Studies

Final Report (October 2018) – Includes Untreated Water Rate Study
Final Report (October 2016)
Final Report (October 2015)

Untreated Water

Row of grape trees extending off into the distance.Untreated Water Service Rates for CY 2020

To determine the untreated water rate for calendar year 2020, Zone 7 contracted with Raftelis Financial Consultants, Inc. (Raftelis) to conduct a cost of service study for untreated water service. The process included discussions with untreated water customers and the Zone 7 Finance Committee. On October 16, 2019 the Board adopted a rate of $173 per acre-foot for CY 2020.

Board Resolution No. 19-84
Staff Report – Untreated Water Rates
Final Report

Untreated Water Service Rates for CY 2019

Board Resolution No. 18-75

Untreated Water Rates for CY 2018

Board Resolution No. 17-83
Staff Report – Untreated Water Rates

Untreated Water Rates for CY 2017

Board Resolution No. 16-171
Staff Report – Untreated Water Rates

Untreated Water Stakeholders Engagement Workshop #1 May 6, 2021

Water Rates

Additional documents 

Rules & Regulations 

Untreated Water FAQ's