Know Your Environment. Protect Your Health.

Arsenic

Lafayette Utilities Water System

Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.

 

59

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.500 ppb208ND - 2.00 ppb
2019ND160ND
20200.275 ppb41ND - 1.10 ppb
20210.310 ppb102ND - 1.70 ppb
20220.483 ppb62ND - 1.60 ppb
20230.600 ppb31ND - 1.80 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.004 ppb

The EWG Health Guideline of 0.004 ppb for arsenic was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL): 10 ppb

The legal limit for arsenic, established in 2001, was based on costs for arsenic removal, as calculated at the time that the standard was set. This limit does not fully protect against the risk of cancer due to arsenic exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-05AE208672.00 ppb
2018-03-05AE208551.000 ppb
2018-03-05AE208672.00 ppb
2018-03-05AE20864ND
2018-03-05AE20861ND
2018-03-05AE20858ND
2018-03-05AE208551.000 ppb
2018-03-05AE20858ND
2018-03-05AE20861ND
2018-03-05AE20864ND
2018-04-30AE21621ND
2018-04-30AE21621ND
2018-05-14AE21747ND
2018-05-14AE21747ND
2018-06-18AE21918ND
2018-06-18AE21918ND
2018-06-19AE219211.000 ppb
2018-06-19AE219241.000 ppb
2018-06-19AE219241.000 ppb
2018-06-19AE219211.000 ppb
2019-01-1435442886001ND
2019-01-14B1900254-001ND
2019-01-1435442886001ND
2019-01-14B1900254-001ND
2019-01-14B1900254-002ND
2019-01-14B1900254-002ND
2019-08-12B1903460-002ND
2019-08-12B1903460-004ND
2019-08-12B1903460-003ND
2019-08-12B1903460-002ND
2019-08-12B1903460-001ND
2019-08-12B1903460-005ND
2019-08-12B1903460-004ND
2019-08-12B1903460-003ND
2019-08-12B1903460-001ND
2019-08-12B1903460-005ND
2020-05-1535551258001ND
2020-07-20B2003551-001ND
2020-07-20B2003551-0031.10 ppb
2020-07-20B2003551-002ND
2021-02-08B2100522-005ND
2021-02-08B2100522-004ND
2021-02-08B2100522-003ND
2021-02-08B2100522-002ND
2021-02-08B2100522-001ND
2021-06-21B2102780-0041.40 ppb
2021-06-21B2102780-0051.70 ppb
2021-06-21B2102780-003ND
2021-06-21B2102780-002ND
2021-06-21B2102780-001ND
2022-05-23B2202455-001ND
2022-05-23B2202455-0021.30 ppb
2022-05-23B2202455-003ND
2022-05-23B2202455-004ND
2022-05-23B2202455-0051.60 ppb
2022-05-23B2202455-006ND
2023-05-22B2302104-0011.80 ppb
2023-05-22B2302104-002ND
2023-05-22B2302104-003ND