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.

System water quality

Treatment Plants Lafayette Orinda Sobrante Upper San Leandro Walnut Creek San Pablo
Chloramine
(mg/L)
OS 2.32

12/9/2018

3.28

12/9/2018

3.23

12/9/2018

2.61

12/9/2018

OS
Fluoride
(mg/L)
OS 0.69

12/3/2018 10:58AM

0.75

11/6/2018 8:00AM

0.75

11/6/2018 8:30AM

0.71

11/27/2018 7:25AM

OS
Hardness
(mg/L)
OS 30

11/6/2018 8:40AM

71

11/6/2018 8:00AM

140

11/6/2018 8:30AM

18

11/6/2018 7:50AM

OS
Hardness
(grains/gallon)
OS 1.8

11/6/2018 8:40AM

4.2

11/6/2018 8:00AM

8.2

11/6/2018 8:30AM

1.1

11/6/2018 7:50AM

OS
pH OS 9.28

12/9/2018

8.56

12/9/2018

8.53

12/9/2018

9.33

12/9/2018

OS
Temperature
(oC)
OS 14.35

12/9/2018

13.3

12/9/2018

13.7

12/9/2018

15.27

12/9/2018

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