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EWG's Tap Water Database — 2021 UPDATE

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What About Lead?

Tilden, City of - 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: 28

Highest level detected in 2019: 5.4 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
2019-05-136072325.38 ppb
2019-02-075958161.12 ppb
2019-09-036336900.862 ppb
2019-05-136072300.752 ppb
2019-02-075958110.634 ppb
2019-08-236323160.566 ppb
2019-05-136072310.514 ppb
2019-08-23632315ND
2019-08-23632313ND
2019-08-13625608ND
2019-05-13607236ND
2019-08-13625604ND
2019-08-13625603ND
2019-08-13625602ND
2019-08-13625601ND
2019-08-13625599ND
2019-05-14607239ND
2019-05-13607238ND
2019-05-13607237ND
2019-02-07595809ND
2019-05-13607235ND
2019-05-13607234ND
2019-05-13607233ND
2019-02-07595815ND
2019-02-07595814ND
2019-02-07595813ND
2019-02-07595812ND
2019-02-07595810ND
MORE
LESS

Read more about lead here.