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EWG's Tap Water Database — 2021 UPDATE

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Chromium (total)

San Antonio Water System Northeast

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.

MORE ABOUT THIS CONTAMINANT

 

31

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND100ND
2014ND140ND
2015ND30ND
2016N/A00N/A
2017N/A00N/A
2018ND30ND
2019ND10ND

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
2013-10-08201310110256AMND
2013-10-08201310110254AMND
2013-10-08201310110252AMND
2013-10-08201310110260AMND
2013-10-08201310110246AMND
2013-10-08201310110244AMND
2013-10-08201310110250AMND
2013-10-08201310110242AMND
2013-10-08201310110248AMND
2013-10-08201310110258AMND
2014-01-24201401270007AMND
2014-01-24201401270009AMND
2014-04-14201404150337AMND
2014-04-14201404150347AMND
2014-04-14201404150335AMND
2014-04-14201404150333AMND
2014-04-14201404150339AMND
2014-04-14201404150343AMND
2014-04-14201404150341AMND
2014-04-14201404150345AMND
2014-04-15201404160662AMND
2014-04-15201404160660AMND
2014-07-25201407260066AMND
2014-07-25201407260068AMND
2015-07-08AC98675ND
2015-07-08AC98680ND
2015-07-09AC98917ND
2018-03-26AE19867ND
2018-05-10AE25849ND
2018-05-10AE25850ND
2019-04-22AE63113ND