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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

Logan City Water System

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
2012ND20ND
2013N/A00N/A
20140.270 ppb62ND - 1.01 ppb
20150.381 ppb76ND - 1.05 ppb
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 Result
2012-08-15ND
2012-08-15ND
2014-11-12ND
2014-11-12ND
2014-11-120.610 ppb
2014-11-12ND
2014-11-12ND
2014-11-121.01 ppb
2015-05-200.527 ppb
2015-05-200.220 ppb
2015-05-200.257 ppb
2015-05-200.301 ppb
2015-05-200.317 ppb
2015-05-201.05 ppb
2015-07-29ND
2016-02-26ND