Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Chromium (total)

Centennial Water and Sanitation District

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.

 

35

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
20130.0765 ppb174ND - 0.570 ppb
2014ND70ND
2015ND20ND
20161.67 ppb331.000 ppb - 2.00 ppb
20170.333 ppb31ND - 1.000 ppb

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 Result
2012-08-22ND
2012-08-23ND
2012-10-31ND
2013-03-19ND
2013-03-19ND
2013-05-130.280 ppb
2013-05-13ND
2013-05-130.230 ppb
2013-06-12ND
2013-06-12ND
2013-06-260.220 ppb
2013-08-12ND
2013-08-12ND
2013-08-12ND
2013-08-12ND
2013-08-27ND
2013-11-11ND
2013-11-110.570 ppb
2013-11-11ND
2013-12-03ND
2014-02-18ND
2014-02-18ND
2014-02-18ND
2014-02-18ND
2014-07-23ND
2014-07-29ND
2014-08-12ND
2015-07-27ND
2015-08-12ND
2016-07-271.000 ppb
2016-07-272.00 ppb
2016-08-172.00 ppb
2017-01-25ND
2017-01-25ND
2017-08-151.000 ppb