Know Your Environment. Protect Your Health.

Arsenic

Ventura County Waterworks District No. 19 - Somis

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND30ND
2021ND30ND
2022ND30ND
20231.33 ppb31ND - 4.00 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
2018-08-01CA5610015_002_002-201808011404ND
2018-08-01CA5610015_007_007-201808011337ND
2018-08-14CA5610015_001_001-201808141147ND
2019-08-07CA5610015_001_001-201908071409ND
2019-08-07CA5610015_007_007-201908071317ND
2019-08-07CA5610015_002_002-201908071345ND
2020-08-03CA5610015_007_007-202008031556ND
2020-08-04CA5610015_001_001-202008041455ND
2020-08-04CA5610015_002_002-202008041411ND
2021-08-04CA5610015_007_007-202108040940ND
2021-08-04CA5610015_002_002-202108040830ND
2021-08-04CA5610015_001_001-202108041007ND
2022-08-16CA5610015_002_002-202208160933ND
2022-08-17CA5610015_007_007-202208170841ND
2022-08-22CA5610015_001_001-202208221052ND
2023-08-08CA5610015_001_001-202308081445ND
2023-08-08CA5610015_002_002-202308081515ND
2023-08-09CA5610015_007_007-2023080909304.00 ppb