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EWG's Tap Water Database — 2021 UPDATE

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What About Lead?

Columbia - 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: 50

Highest level detected in 2019: 5.3 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
2019-09-18AD450435.34 ppb
2019-09-18AD450664.90 ppb
2019-09-17AD450654.73 ppb
2019-09-16AD450613.42 ppb
2019-09-17AD450583.34 ppb
2019-09-15AD450503.06 ppb
2019-09-16AD450493.03 ppb
2019-09-17AD450732.72 ppb
2019-09-17AD450592.40 ppb
2019-09-16AD450572.02 ppb
2019-09-16AD450601.84 ppb
2019-09-17AD450671.77 ppb
2019-09-17AD450421.60 ppb
2019-09-13AD450841.58 ppb
2019-09-17AD450891.55 ppb
2019-09-16AD450901.51 ppb
2019-09-17AD450451.34 ppb
2019-09-17AD450481.28 ppb
2019-09-17AD450751.17 ppb
2019-09-16AD450851.16 ppb
2019-09-17AD450761.15 ppb
2019-09-17AD450711.08 ppb
2019-09-16AD450621.04 ppb
2019-09-17AD45044ND
2019-09-17AD45064ND
2019-09-17AD45047ND
2019-09-17AD45063ND
2019-09-17AD45080ND
2019-09-17AD45069ND
2019-09-17AD45053ND
2019-09-18AD45087ND
2019-09-18AD45054ND
2019-09-19AD45068ND
2019-09-17AD45081ND
2019-09-14AD45086ND
2019-09-16AD45052ND
2019-09-16AD45074ND
2019-09-16AD45077ND
2019-09-16AD45070ND
2019-09-17AD45046ND
2019-09-17AD45051ND
2019-09-17AD45088ND
2019-09-17AD45083ND
2019-09-17AD45091ND
2019-09-17AD45055ND
2019-09-17AD45056ND
2019-09-17AD45079ND
2019-09-17AD45078ND
2019-09-17AD45082ND
2019-09-17AD45072ND
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Read more about lead here.