Water Quality


How We Monitor Drinking Water for Safety

  To closely monitor water safety, DSRSD employees collect representative samples for field testing as well as analysis in the district’s laboratory.

Federal and state regulations require close monitoring of all water supplies. The water the district supplies to customers meets or exceeds all primary and secondary drinking water standards.

Many people work every day to protect the quality of our water. DSRSD employees collect representative samples from 60 locations throughout the water distribution system. The district’s laboratory, which is certified by the State Water Board Division of Drinking Water’s Environmental Laboratory Accreditation Program, analyzes the samples. Zone 7 also monitors water quality continuously online, as well as with instantaneous, or “grab,” sampling. In all, DSRSD and Zone 7 test for more than 100 water quality standards, including coliform bacteria, minerals, metals, fluoride, residual amounts of chlorine used as a disinfectant, and many other chemicals.

DSRSD publishes a water quality report by June 30th each year that summarizes water quality monitoring results from the previous calendar year. We notify all customers when the report is available in our online library. To request a printed copy, call Customer Service at (925) 828-8524. Zone 7 also publishes an annual Consumer Confidence Report.

Total Coliform Notices

Samples from two areas of the DSRSD water system recently have exceeded the drinking water standard (maximum contaminant level) for total coliform bacteria. The water was safe to drink at all times. This was not an emergency. Please visit Coliform Notices for more information.

Water Quality FAQs

Expand/Contract Questions and Answers

  • Does our water meet safety standards for chromium 6?

  • What do I do if I have problems with my water or other questions?

  • Why does the taste of our tap water sometimes change?

  • Why does our water taste different than EBMUD's?

  • What is Zone 7 doing to improve water taste?

  • Have local toxic algae blooms affected our drinking water supply?

  • How hard is our water?

  • What is being done to improve water hardness?

  • What do you advise about water softeners?

  • Does our tap water contain fluoride?

  • Is our water tested for lead?

  • How often is water tested?

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