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EWG's Tap Water Database — 2021 UPDATE

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Chromium (total)

Nob Hill Water Association

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
20140.790 ppb106ND - 1.70 ppb
20150.735 ppb87ND - 1.20 ppb
20160.567 ppb330.200 ppb - 1.30 ppb
2017N/A00N/A
2018N/A00N/A
20192.10 ppb112.10 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
2014-04-21WA97-SE1-14-07091.40 ppb
2014-04-21WA97-SE1-14-0709ND
2014-04-21WA97-SE1-14-0709ND
2014-04-21WA97-SE1-14-07091.60 ppb
2014-04-21WA97-SE1-14-0709ND
2014-04-21WA97-SE1-14-07091.70 ppb
2014-09-09WA97-SE1-14-1795ND
2014-09-09WA97-SE1-14-17951.60 ppb
2014-09-09WA97-SE1-14-17951.40 ppb
2014-09-09WA97-SE1-14-17950.200 ppb
2015-05-14WA97-SE2-15-09601.10 ppb
2015-05-14WA97-SE2-15-09601.20 ppb
2015-05-14WA97-SE2-15-09600.480 ppb
2015-05-14WA97-SE1-15-09600.210 ppb
2015-10-06WA97-SE2-15-21661.10 ppb
2015-10-06WA97-SE2-15-21660.980 ppb
2015-10-06WA97-SE2-15-21660.810 ppb
2015-10-06WA97-SE2-15-2166ND
2016-07-131.30 ppb
2016-07-130.200 ppb
2016-07-130.200 ppb
2019-07-022.10 ppb