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EWG's Tap Water Database — 2019 UPDATE

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Arsenic

Tempe Water Supply Corporation 1

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.

 

53

Samples

43

Samples exceeding legal limit (MCL)

48

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201213.3 ppb108ND - 23.2 ppb
201315.0 ppb8811.3 ppb - 18.1 ppb
20149.11 ppb87ND - 19.8 ppb
201512.4 ppb98ND - 18.3 ppb
201612.8 ppb98ND - 18.0 ppb
201714.7 ppb999.70 ppb - 18.0 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
2012-02-29AB8229623.2 ppb
2012-02-29AB82286ND
2012-02-29AB8228713.5 ppb
2012-02-29AB82282ND
2012-04-17AB8706919.3 ppb
2012-04-17AB8706813.5 ppb
2012-09-12AC0065513.0 ppb
2012-09-12AC0065222.8 ppb
2012-12-11AC0648916.6 ppb
2012-12-11AC0648710.8 ppb
2013-02-26AC1151617.1 ppb
2013-02-26AC1151411.3 ppb
2013-06-14AC2219118.1 ppb
2013-06-14AC2218911.6 ppb
2013-08-07AC2702617.8 ppb
2013-08-07AC2702714.4 ppb
2013-11-07AC3454417.9 ppb
2013-11-07AC3454111.9 ppb
2014-01-15AC3897810.5 ppb
2014-01-15AC389687.00 ppb
2014-04-16AC5079012.4 ppb
2014-04-16AC507897.70 ppb
2014-09-08AC660202.30 ppb
2014-09-08AC6602119.8 ppb
2014-12-19AC75600ND
2014-12-19AC7559713.2 ppb
2015-02-24AC816108.90 ppb
2015-02-24AC81602ND
2015-02-24AC8160313.6 ppb
2015-06-02AC9409714.6 ppb
2015-06-02AC9409512.7 ppb
2015-08-12AD0376317.5 ppb
2015-09-10AD0644913.0 ppb
2015-12-03AD1535213.1 ppb
2015-12-03AD1535118.3 ppb
2016-02-25AD2564111.2 ppb
2016-02-25AD2564417.5 ppb
2016-02-25AD25620ND
2016-06-07AD3952815.9 ppb
2016-06-07AD3952914.4 ppb
2016-09-12AD4874612.6 ppb
2016-09-12AD4874718.0 ppb
2016-11-15AD5795114.7 ppb
2016-11-15AD5795210.6 ppb
2017-02-15AD7079917.8 ppb
2017-02-15AD7079811.6 ppb
2017-02-15AD7078216.9 ppb
2017-06-01AD8633017.8 ppb
2017-06-01AD8632910.4 ppb
2017-09-14AD9618515.1 ppb
2017-09-14AD961849.70 ppb
2017-11-07AE0378914.6 ppb
2017-11-07AE0378818.0 ppb