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EWG's Tap Water Database — 2019 UPDATE

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Arsenic

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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.

 

36

Samples

5

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201211.0 ppb11112.40 ppb - 33.0 ppb
20131.55 ppb64ND - 5.90 ppb
20142.34 ppb43ND - 7.90 ppb
2015ND50ND
20168.48 ppb63ND - 27.5 ppb
20170.350 ppb41ND - 1.40 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
2012-01-186.29 ppb
2012-03-124.80 ppb
2012-05-2233.0 ppb
2012-05-2233.0 ppb
2012-06-255.80 ppb
2012-07-249.10 ppb
2012-09-188.30 ppb
2012-09-2811.0 ppb
2012-10-173.10 ppb
2012-11-262.40 ppb
2012-12-184.70 ppb
2013-01-222.30 ppb
2013-02-265.90 ppb
2013-03-130.500 ppb
2013-05-15ND
2013-09-17ND
2013-11-190.610 ppb
2014-02-117.90 ppb
2014-05-120.590 ppb
2014-09-16ND
2014-12-140.850 ppb
2015-03-04K000483001ND
2015-05-11K011872001ND
2015-07-27K026303001ND
2015-07-27K004378001ND
2015-10-141510-01143-001-AND
2016-01-121601-00934-002-AND
2016-05-101605-01210-0021.30 ppb
2016-09-261609-02755-001ND
2016-10-181610-01783-00127.5 ppb
2016-11-161611-01673-00122.1 ppb
2016-12-191612-01644-001ND
2017-02-281703-00079-001ND
2017-04-261704-02745-001ND
2017-09-121709-01446-001ND
2017-10-171710-02005-0011.40 ppb