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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

City of Portsmouth

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
20130.514 ppb98ND - 1.10 ppb
2014ND10ND
2015ND20ND
2016ND10ND
2017N/A00N/A

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
2012-04-1112-05476METND
2013-01-11201301170718AM0.370 ppb
2013-01-11201301170726AM0.380 ppb
2013-04-0813-05584METND
2013-04-09201304110612AM1.10 ppb
2013-04-09201304110598AM0.310 ppb
2013-07-08201307090249AM0.340 ppb
2013-07-08201307090245AM0.470 ppb
2013-10-01201310030404AM0.830 ppb
2013-10-01201310030468AM0.830 ppb
2014-04-0214-05026METND
2015-04-06460013-JAMES R.ND
2015-04-06460013-JAMES R.ND
2016-04-1816-06585-METND