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EWG's Tap Water Database — 2021 UPDATE

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Chromium (total)

City of Conroe

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

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42

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND200ND
2015N/A00N/A
2016ND50ND
2017ND100ND
2018ND20ND
2019ND50ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date Lab ID Result
2014-04-09AC49902ND
2014-04-09AC49903ND
2014-04-09AC49915ND
2014-04-09AC49913ND
2014-04-09AC49910ND
2014-04-09AC49914ND
2014-05-28AC55316ND
2014-05-29Q1418221009ND
2014-05-29Q1418221001ND
2014-05-29Q1418221005ND
2014-11-18Q1456289029ND
2014-11-18Q1456289033ND
2014-11-18Q1456289021ND
2014-11-18Q1456289025ND
2014-11-18Q1456289037ND
2014-11-18Q1456289005ND
2014-11-18Q1456740005ND
2014-11-18Q1456289001ND
2014-11-18Q1456289017ND
2014-11-18Q1456289013ND
2016-01-11AD17254ND
2016-01-11AD17257ND
2016-01-11AD17258ND
2016-01-11AD17256ND
2016-01-11AD17253ND
2017-01-09AD63506ND
2017-01-09AD63511ND
2017-01-09AD63501ND
2017-04-11AD79142ND
2017-04-11AD79140ND
2017-04-11AD79141ND
2017-05-18AD84773ND
2017-05-18AD84775ND
2017-05-18AD84776ND
2017-05-18AD84774ND
2018-03-08AE17443ND
2018-03-27AE20144ND
2019-03-11AE57792ND
2019-03-11AE57793ND
2019-03-11AE57791ND
2019-04-08AE61293ND
2019-04-08AE61294ND