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EWG's Tap Water Database — 2019 UPDATE

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Arsenic

Water District 1 of Johnson County

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
20130.357 ppb72ND - 1.50 ppb
20140.867 ppb32ND - 1.50 ppb
20151.000 ppb32ND - 1.60 ppb
20160.767 ppb32ND - 1.20 ppb
20171.67 ppb331.40 ppb - 1.90 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
2012-03-06576121WSND
2012-03-06576120WSND
2012-05-22MAY2012-IOC-TP2ND
2012-05-22MAY2012-IOC-TP3ND
2012-05-29579491WSND
2012-05-30MAY2012-IOC-TP1ND
2013-03-05592968WS1.50 ppb
2013-03-05592969WSND
2013-05-01MAY2013-IOC-TP3ND
2013-05-01MAY2013-IOC-TP2ND
2013-05-01MAY2013-IOC-TP1ND
2013-05-14596073WS1.000 ppb
2013-07-08JUL2013-IOC-TP1ND
2014-03-04702601.50 ppb
2014-03-0470247ND
2014-05-131134331.10 ppb
2015-05-04322586ND
2015-05-043225851.60 ppb
2015-05-043225841.40 ppb
2016-05-175480231.10 ppb
2016-05-17548022ND
2016-06-205667341.20 ppb
2017-02-147085521.70 ppb
2017-02-147085511.90 ppb
2017-02-147085501.40 ppb