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. On the map below, find your city and the corresponding treatment plant. Then find the column in the table for the most recent water qualtiy data from that treatment plant.  OS means "Out of Service".

System water quality

Treatment Plants Lafayette Orinda Sobrante Upper San Leandro Walnut Creek San Pablo
Chloramine
(mg/L)
OS OS 3.82

3/22/2023

3.6

3/22/2023

2.68

3/22/2023

OS
Fluoride
(mg/L)
OS OS 0.8

3/7/2023 9:12AM

0.7

1/9/2023 10:55AM

0.72

3/7/2023 8:55AM

OS
Hardness
(mg/L)
OS OS 72

2/7/2023 9:03AM

88

1/9/2023 10:55AM

20

2/7/2023 7:33AM

OS
Hardness
(grains/gallon)
OS OS 4.2

2/7/2023 9:03AM

5.1

1/9/2023 10:55AM

1.2

2/7/2023 7:33AM

OS
pH OS OS 8.62

3/22/2023

8.37

3/22/2023

9.3

3/22/2023

OS
Temperature
(oC)
OS OS 11.3

3/22/2023

12.48

3/22/2023

11.18

3/22/2023

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 

District Map March 2023