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EWG's Tap Water Database — 2019 UPDATE

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Arsenic

St. Louis City

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.560 ppb21ND - 1.12 ppb
2013ND20ND
2014ND20ND
2015ND20ND
20160.679 ppb220.626 ppb - 0.732 ppb
20170.850 ppb220.780 ppb - 0.920 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
2012-11-14AB87313ND
2012-11-14AB873141.12 ppb
2013-12-02CRCW120213IOCND
2013-12-02HBBC120213IOCND
2014-05-28AC23435ND
2014-05-28AC23436ND
2015-05-29HBCB052915IOCND
2015-05-29CRCW052915IOCND
2016-07-19CRCW071916IOC0.732 ppb
2016-07-19HBCB071916IOC0.626 ppb
2017-08-16CRCW081617IOC0.780 ppb
2017-08-16HBBC081617IOC0.920 ppb