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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

Concord Water Department

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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND90ND
20140.500 ppb41ND - 2.00 ppb
2015ND20ND
2016ND10ND
20170.250 ppb41ND - 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 Lab ID Result
2012-08-16113258.01ND
2012-10-23115341.03ND
2013-03-18710208-8666ND
2013-03-18710210-8666ND
2013-06-10724543-9115ND
2013-06-10724541-9115ND
2013-08-13123484.01ND
2013-09-09743145-9752ND
2013-09-09743147-9752ND
2013-12-10762350-10446ND
2013-12-10762352-10446ND
2014-08-08134540.01ND
2014-10-31137495.01ND
2014-10-31137495.042.00 ppb
2014-10-31137495.02ND
2015-08-07146612.01ND
2015-10-15149110.03ND
2016-08-05159131.01ND
2017-08-04171853.01ND
2017-11-13175839.051.000 ppb
2017-11-13175839.03ND
2017-11-13175839.02ND