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. Scroll down to 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 2.58

2/23/2024

3.67

2/23/2024

OS 2.66

2/23/2024

OS
Fluoride
(mg/L)
OS 0.75

2/8/2024 8:00AM

0.68

2/6/2024 9:35AM

OS 0.72

2/6/2024 9:30AM

OS
Hardness
(mg/L)
OS 20

2/8/2024 8:00AM

77

2/6/2024 9:35AM

OS 16

2/6/2024 9:30AM

OS
Hardness
(grains/gallon)
OS 1.2

2/8/2024 8:00AM

4.5

2/6/2024 9:35AM

OS 0.9

2/6/2024 9:30AM

OS
pH OS 9.4

2/23/2024

8.5

2/23/2024

OS 9.29

2/23/2024

OS
Temperature
(oC)
OS 11.88

2/23/2024

12.93

2/23/2024

OS 12.97

2/23/2024

OS
Total Dissolved Solids
(mg/L)
OS 41.5

2/20/2024

151

2/21/2024

OS 28.63

2/20/2024

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 

EBMUD Service Area Map March 2023