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EWG's Tap Water Database — 2019 UPDATE

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Arsenic

California Water Service Co-leona Valley

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.

 

35

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013N/A00N/A
2014ND10ND
20150.649 ppb87ND - 1.89 ppb
2016ND120ND
2017ND130ND

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
2012-02-085810-006-1403ND
2014-05-065810-001-1356ND
2015-02-025810-006-1416ND
2015-05-135701-001-12100.301 ppb
2015-05-135701-006-12110.370 ppb
2015-05-135701-005-12051.37 ppb
2015-06-095701-001-10270.353 ppb
2015-08-045701-001-13490.407 ppb
2015-08-045701-006-13470.496 ppb
2015-08-045701-005-13411.89 ppb
2016-02-095701-006-1041ND
2016-02-095701-001-1045ND
2016-02-095701-005-1113ND
2016-05-035701-001-1245ND
2016-05-035701-005-1230ND
2016-05-035701-006-1237ND
2016-08-095701-005-0858ND
2016-08-095701-001-0902ND
2016-08-095701-006-0905ND
2016-11-085701-006-1420ND
2016-11-085701-005-1451ND
2016-11-085701-001-1429ND
2017-02-075701-005-1120ND
2017-02-075701-006-1142ND
2017-02-075701-001-1137ND
2017-05-085810-001-1248ND
2017-05-095701-005-0940ND
2017-05-095701-006-0949ND
2017-05-095701-001-0946ND
2017-08-155701-005-1356ND
2017-08-155701-006-1405ND
2017-08-155701-001-1400ND
2017-11-085701-005-1414ND
2017-11-085701-001-1723ND
2017-12-125701-006-1531ND