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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

Chapel Hill - Aberdeen Proving Grounds

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND30ND
20140.240 ppb32ND - 0.360 ppb
20150.299 ppb76ND - 0.440 ppb
2016ND10ND
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
2012-12-260120002011004827ND
2013-09-26130926_01_050309ND
2013-09-26130926_01_105030ND
2013-11-27131127_01_106090ND
2014-10-2220360800040.360 ppb
2014-10-2220360800010.360 ppb
2014-11-14141114_01_20403-ND
2015-01-2120507720010.270 ppb
2015-01-2120507720040.290 ppb
2015-04-2820676230010.330 ppb
2015-04-2820676230040.350 ppb
2015-07-2320850770010.410 ppb
2015-07-2320850770040.440 ppb
2015-11-182109047001ND
2016-11-142189625001ND
2017-11-152276754ND