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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

North Texas Municipal Water District Tawakoni Water Treatment Plant

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.421 ppb110.421 ppb
2013ND10ND
20140.580 ppb110.580 ppb
20150.510 ppb110.510 ppb
20160.890 ppb110.890 ppb
2017ND10ND

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
2012-12-1212125590020.421 ppb
2013-08-20Q1305807004ND
2014-11-10Q14552840010.580 ppb
2015-05-28Q15196480040.510 ppb
2016-05-25Q16207960010.890 ppb
2017-06-27Q1726831001ND