Water quality data

Every day of the year EBMUD samples and tests your water extensively in laboratories and in the field to make sure it is safe to drink.

More than 20,000 annual laboratory tests ensure the safety of your drinking water and that all customers receive high-quality drinking water that meets or surpasses all state and federal regulatory requirements and standards.  Every drop of water that comes out of your tap is first treated at one of our treatment plants (see map below). EBMUD's six water treatment plants in the East Bay can filter and process more than 375 million gallons of water daily. In the table below, OS means "Out of Service".

System water quality

Treatment Plants Lafayette Orinda Sobrante Upper San Leandro Walnut Creek San Pablo
Chloramine
(mg/L)
2.3

4/8/2020

2.6

4/8/2020

OS OS 2.58

4/8/2020

OS
Fluoride
(mg/L)
0.72

3/31/2020 9:40AM

0.74

4/1/2020 9:13AM

OS OS 0.74

3/31/2020 8:20AM

OS
Hardness
(mg/L)
13

12/3/2019 8:25AM

17

3/3/2020 7:00AM

OS OS 18

3/3/2020 7:15AM

OS
Hardness
(grains/gallon)
0.8

12/3/2019 8:25AM

1

3/3/2020 7:00AM

OS OS 1.1

3/3/2020 7:15AM

OS
pH 8.99

4/8/2020

9.4

4/8/2020

OS OS 9.3

4/8/2020

OS
Temperature
(oC)
12.55

4/8/2020

11.35

4/8/2020

OS OS 12.93

4/8/2020

OS

To convert the "Hardness" values into grains per gallon (gpg), divide the values shown in the tables in milligrams per liter (mg/L) by 17.

Sample results displayed are the most recent samplings available.

If you have questions regarding water quality data, please contact us at 1-866-403-2683. You may also refer to the Annual Water Quality Report for more information.

Where your water is treated 

water-quality-map-Feb2015.jpg