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EWG's Tap Water Database — 2021 UPDATE

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What About Lead?

439 Water Supply Corporation - click here to return to the utility page.

According to EWG’s analysis of 2019 lead testing results, this utility complied with federal water quality regulations for lead. Under the federal Lead and Copper Rule, lead concentrations must be below 15 parts per billion (ppb) in 90 percent of households sampled. If this legal limit is exceeded, the water utility must apply measures to control lead leaching from water pipes.

Number of lead samples taken in 2019: 20

Highest level detected in 2019: 0.0 ppb

Levels of lead detected


Complying with the EPA's lead rules doesn't mean that the water is safe for children to drink. The EPA’s recent modeling suggests that lead concentrations in the 3.8 to 15 ppb range can put a formula-fed baby at risk of elevated blood lead levels. In 2009, the California Office of Environmental Health Hazard Assessment set a public health goal level of 0.2 ppb for lead in drinking water to protect against even subtle IQ loss in children.

Lead Results, 2019

Samples in red indicate that the sample is above the EPA action level.

DateLab IDResult
2019-09-181824329ND
2019-10-171830654ND
2019-10-171830650ND
2019-10-171830653ND
2019-10-161830655ND
2019-09-251824344ND
2019-09-251824330ND
2019-09-251824331ND
2019-09-241824345ND
2019-09-201824337ND
2019-09-181824332ND
2019-09-181824338ND
2019-09-181824343ND
2019-09-181824346ND
2019-09-181824347ND
2019-09-181824342ND
2019-09-181824341ND
2019-09-181824336ND
2019-09-181824334ND
2019-09-181824333ND
MORE
LESS

Read more about lead here.