Chromium (total)

JBMDL-Dix Main 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.

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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
2013	0.210 ppb	4	3	ND - 0.300 ppb
2014	0.125 ppb	11	5	ND - 0.310 ppb
2015	ND	3	0	ND
2016	ND	4	0	ND
2017	ND	3	0	ND
2018	ND	1	0	ND
2019	ND	1	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
2013-12-17	35120172001AM	0.250 ppb
2013-12-17	35120172005AM	0.290 ppb
2013-12-17	35120172007AM	0.300 ppb
2013-12-17	35120172003AM	ND
2014-03-17	35130447001AM	ND
2014-03-17	35130447003AM	ND
2014-04-15	14-1905	ND
2014-05-06	14-2228	ND
2014-05-06	14-2227	ND
2014-08-18	35151092001AM	0.300 ppb
2014-08-18	35151092005AM	ND
2014-08-18	35151092007AM	0.270 ppb
2014-08-18	35151092003AM	0.230 ppb
2014-09-08	35154318001AM	0.310 ppb
2014-09-08	35154318003AM	0.270 ppb
2015-04-15	15-1966	ND
2015-04-15	15-1974	ND
2015-04-15	15-1975	ND
2016-08-10	16-5165	ND
2016-08-10	16-5168.1	ND
2016-08-10	16-5169	ND
2016-08-10	16-5168	ND
2017-04-12	17-2163	ND
2017-04-12	17-2162	ND
2017-04-12	17-2161	ND
2018-04-11	18-2053	ND
2019-04-10	19-1973	ND