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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

Golden State Water Company - Edna

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.

MORE ABOUT THIS CONTAMINANT

 

86

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND190ND
20150.131 ppb161ND - 2.10 ppb
2016ND120ND
20170.425 ppb122ND - 2.80 ppb
20180.371 ppb142ND - 3.00 ppb
20190.208 ppb131ND - 2.70 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2014-01-022706-012-0738ND
2014-01-082706-012-0734ND
2014-02-052706-012-0826ND
2014-02-122706-012-0819ND
2014-03-052706-012-0800ND
2014-03-192706-012-0803ND
2014-04-022706-012-0751ND
2014-05-072706-016-0823ND
2014-05-072706-012-0806ND
2014-06-042706-012-0830ND
2014-07-022706-012-0825ND
2014-07-232706-012-0750ND
2014-08-202706-012-0800ND
2014-08-262706-012-0835ND
2014-09-032706-012-0800ND
2014-10-012706-012-0842ND
2014-11-052706-012-0818ND
2014-11-052706-016-0750ND
2014-12-032706-012-0835ND
2015-01-072706-012-0825ND
2015-02-042706-012-0834ND
2015-03-112706-012-0900ND
2015-04-012706-012-0825ND
2015-04-222706-012-0855ND
2015-05-062706-012-0830ND
2015-06-032706-012-0840ND
2015-07-012706-012-0840ND
2015-07-082706-012-0930ND
2015-08-052706-012-0818ND
2015-08-122706-012-08552.10 ppb
2015-09-022706-012-0840ND
2015-10-072706-012-0835ND
2015-11-042706-012-0740ND
2015-12-022706-012-0825ND
2015-12-162706-012-0855ND
2016-01-062706-012-0820ND
2016-02-032706-012-0910ND
2016-03-022706-012-0815ND
2016-04-062706-012-0855ND
2016-05-042706-012-0900ND
2016-06-012706-012-0820ND
2016-07-062706-012-0905ND
2016-08-032706-012-0900ND
2016-09-142706-012-0740ND
2016-10-122706-012-0825ND
2016-11-022706-012-0800ND
2016-12-072706-012-0950ND
2017-01-109590-012-0925ND
2017-02-079590-012-0925ND
2017-03-079590-012-08152.80 ppb
2017-04-049590-012-0732ND
2017-05-029590-012-0858ND
2017-07-059590-012-0930ND
2017-07-079590-012-1035ND
2017-08-019590-012-09202.30 ppb
2017-09-059590-012-0845ND
2017-10-039590-012-0930ND
2017-11-079590-012-0800ND
2017-12-059590-012-0905ND
2018-01-169590-012-0958ND
2018-02-069590-012-0835ND
2018-02-139590-016-11002.20 ppb
2018-03-069590-012-0820ND
2018-04-039590-012-0935ND
2018-05-019590-012-0950ND
2018-06-052438-012-09353.00 ppb
2018-07-179590-012-0700ND
2018-08-069590-012-1135ND
2018-08-139590-012-0935ND
2018-09-109590-012-0900ND
2018-10-019590-012-0955ND
2018-11-059590-012-0907ND
2018-12-039590-012-0945ND
2019-01-029590-012-1000ND
2019-01-229590-016-0955ND
2019-02-049590-012-0922ND
2019-03-049590-012-0855ND
2019-04-019590-012-1010ND
2019-05-069590-012-0845ND
2019-06-039590-012-1010ND
2019-07-089590-012-1020ND
2019-08-059590-012-1028ND
2019-09-039590-012-0855ND
2019-10-079590-012-0820ND
2019-11-049590-012-0935ND
2019-12-029590-012-10342.70 ppb