Chromium (total)

Jordan Valley Water Conservancy District

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	0.432 ppb	29	18	ND - 2.50 ppb
2014	0.710 ppb	5	2	ND - 3.24 ppb
2015	2.00 ppb	3	1	ND - 6.00 ppb
2016	ND	3	0	ND
2017	N/A	0	0	N/A
2018	ND	2	0	ND
2019	ND	3	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	Result
2013-04-16	0.283 ppb
2013-04-16	0.315 ppb
2013-04-16	ND
2013-04-16	ND
2013-05-01	0.661 ppb
2013-05-01	0.228 ppb
2013-05-08	0.528 ppb
2013-05-08	0.339 ppb
2013-05-15	ND
2013-05-15	1.15 ppb
2013-06-26	0.859 ppb
2013-06-26	2.50 ppb
2013-07-01	0.995 ppb
2013-07-09	ND
2013-07-09	ND
2013-07-11	ND
2013-07-11	ND
2013-10-03	0.441 ppb
2013-10-03	ND
2013-10-03	0.691 ppb
2013-10-03	ND
2013-10-03	0.246 ppb
2013-10-09	ND
2013-10-10	0.381 ppb
2013-10-15	1.23 ppb
2013-10-22	0.313 ppb
2013-11-05	0.626 ppb
2013-12-02	0.751 ppb
2013-12-02	ND
2014-01-07	ND
2014-01-07	ND
2014-01-08	0.310 ppb
2014-01-13	ND
2014-02-19	3.24 ppb
2015-01-13	ND
2015-03-30	ND
2015-07-21	6.00 ppb
2016-02-16	ND
2016-02-25	ND
2016-04-20	ND
2018-01-10	ND
2018-08-21	ND
2019-01-16	ND
2019-07-10	ND
2019-07-22	ND