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EWG's Tap Water Database — 2019 UPDATE

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Arsenic

Three Valleys Municipal Water District

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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND20ND
2014ND40ND
2015ND40ND
20161.10 ppb42ND - 2.40 ppb
2017ND50ND

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
2012-02-083761-002-1055ND
2012-03-213761-002-1100ND
2012-07-183761-004-0752ND
2013-02-203761-002-1015ND
2013-03-053761-002-1040ND
2014-02-183761-002-0800ND
2014-03-113761-002-1030ND
2014-08-263761-004-1000ND
2014-09-163761-004-1101ND
2015-02-033761-002-1000ND
2015-02-033761-004-0945ND
2015-03-103761-002-0930ND
2015-07-143761-004-0832ND
2016-02-023761-004-0828ND
2016-02-023761-002-08502.40 ppb
2016-03-153761-002-09002.00 ppb
2016-07-193761-004-0945ND
2017-02-223761-002-0828ND
2017-03-213761-002-0730ND
2017-05-164790-004-0900ND
2017-05-163761-004-0900ND
2017-07-183761-004-0900ND