One of the most important factors in water quality is the source: the purer the source, the better the water. EBMUD's primary water source is Sierra Nevada snowmelt.
Before water reaches your tap, EBMUD takes many steps to ensure its quality. This includes carefully managing and protecting watershed lands and reservoirs, treating the water, maintaining that quality through a complex system of distribution pipes, pumping plants and reservoirs, testing water samples in our lab and in the field, and addressing consumer concerns.
Ninety percent of EBMUD's water comes from the 577-square mile watershed of the Mokelumne River on the western slope of the Sierra Nevada.
Every day of the year EBMUD's laboratory tests water samples to ensure that water quality meets federal and state standards, checking for trace organics like pesticides, metals, and microbes. These efforts ensure that all customers receive high-quality drinking water that meets or surpasses all state and federal regulatory requirements.
Annual water quality report
EBMUD is pleased to report that in 2017, your drinking water met or surpassed every state and federal public health requirement. If you would like a report mailed to you, please email us or call 510-986-7555.
Previous years' reports can be viewed on the Archives page.
Download Annual Water Quality Report
Water quality FAQs
Customers may have similar water quality concerns. Find answers to the most common water quality questions in our Frequently Asked Questions page.
If you still have questions, concerns or problems regarding water quality, such as taste, odor, appearance, etc., or if you have a water quality emergency, please contact us at 1-866-403-2683.
Every drop of water that comes out of your tap is first treated at one of our treatment plants. EBMUD's six water treatment plants in the East Bay can filter and process more than 375 million gallons of water daily.
Water sampling and testing
In laboratories and in the field, EBMUD samples and tests your water extensively to make sure it is safe to drink. We look for more than 100 substances in the water including microorganisms, pesticides, herbicides, asbestos, lead, copper, petroleum products and by-products of industrial and water treatment processes. More than 20,000 annual laboratory tests ensure the safety of your drinking water.
Events in Flint, Michigan have placed a spotlight on lead levels in drinking water and the potential health issues associated with lead. EBMUD meets and surpasses all state and federal drinking water requirements, including the U.S. Environmental Protection Agency’s Lead and Copper Rule. Learn more.