Chromium (total)

Ozark Utilities Board

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.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	0.0478 ppb	9	1	ND - 0.430 ppb
2015	ND	9	0	ND
2016	0.772 ppb	7	7	0.541 ppb - 1.09 ppb
2017	N/A	0	0	N/A
2018	N/A	0	0	N/A
2019	ND	8	0	ND

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
2014-09-24	35156683003AM	ND
2014-09-24	35156683005AM	ND
2014-09-24	35156683007AM	ND
2014-09-24	35156683011AM	ND
2014-09-24	35156683009AM	ND
2014-09-24	35156683001AM	ND
2014-09-26	35157135005AM	ND
2014-09-26	35157135003AM	ND
2014-09-26	35157135001AM	0.430 ppb
2015-03-04	35178814011AM	ND
2015-03-04	35178814013AM	ND
2015-03-04	35178814007AM	ND
2015-03-04	35178814009AM	ND
2015-03-04	35178814017AM	ND
2015-03-04	35178814003AM	ND
2015-03-04	35178814015AM	ND
2015-03-04	35178814005AM	ND
2015-03-04	35178814001AM	ND
2016-03-29	AB10688	0.763 ppb
2016-03-29	AB10693	0.653 ppb
2016-03-29	AB10690	0.928 ppb
2016-03-29	AB10692	0.798 ppb
2016-03-29	AB10687	0.541 ppb
2016-03-29	AB10694	1.09 ppb
2016-03-29	AB10689	0.629 ppb
2019-06-19	AB36106	ND
2019-06-19	AB36104	ND
2019-06-19	AB36105	ND
2019-06-19	AB36103	ND
2019-08-27	AB37946	ND
2019-08-27	AB37947	ND
2019-08-27	AB37948	ND
2019-08-27	AB37949	ND