Chromium (total)

Canyon Municipal 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.

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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	1.24 ppb	15	14	ND - 6.46 ppb
2015	N/A	0	0	N/A
2016	1.75 ppb	2	1	ND - 3.50 ppb
2017	3.13 ppb	3	3	1.70 ppb - 4.40 ppb
2018	N/A	0	0	N/A
2019	1.55 ppb	2	2	1.40 ppb - 1.70 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
2014-02-25	Q1406007013	6.46 ppb
2014-05-28	Q1418231003	0.524 ppb
2014-05-28	Q1418231007	0.943 ppb
2014-05-28	Q1418231005	0.502 ppb
2014-05-28	Q1418231001	1.67 ppb
2014-08-20	Q1437877011	0.982 ppb
2014-08-20	Q1437877001	1.47 ppb
2014-08-20	Q1437877009	0.446 ppb
2014-08-20	Q1437877007	0.500 ppb
2014-08-20	Q1437877005	ND
2014-08-20	Q1437877003	0.928 ppb
2014-11-20	Q1456936003	0.778 ppb
2014-11-20	Q1456936005	0.744 ppb
2014-11-20	Q1456936007	0.998 ppb
2014-11-20	Q1456936001	1.60 ppb
2016-06-09	Q1623378005	3.50 ppb
2016-11-14	Q1649341004	ND
2017-02-09	Q1705995017	3.30 ppb
2017-02-09	Q1705995009	4.40 ppb
2017-05-04	Q1718620008	1.70 ppb
2019-02-21	Q1907705001	1.40 ppb
2019-05-16	Q1926296006	1.70 ppb