Chromium (total)

Hot Springs Utilities

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	0.0875 ppb	4	1	ND - 0.350 ppb
2014	0.0830 ppb	10	1	ND - 0.830 ppb
2015	0.950 ppb	2	1	ND - 1.90 ppb
2016	1.63 ppb	3	1	ND - 4.90 ppb
2017	ND	7	0	ND
2018	ND	2	0	ND
2019	ND	2	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
2013-08-12	Y132270040	ND
2013-08-12	Y132270039	0.350 ppb
2013-10-16	Y132900017	ND
2013-10-16	Y132900016	ND
2014-02-10	140450022	ND
2014-02-10	140450025	ND
2014-02-10	140450024	ND
2014-02-10	140450023	0.830 ppb
2014-04-02	140940002	ND
2014-05-12	141360019	ND
2014-05-12	141360017	ND
2014-05-12	141360020	ND
2014-05-12	141360018	ND
2014-11-17	Y143240002	ND
2015-04-01	Y150920001	1.90 ppb
2015-10-06	Y152820005	ND
2016-04-06	Y160980006	ND
2016-07-06	Y161890031	ND
2016-10-03	Y162800008	4.90 ppb
2017-01-04	Y170050021	ND
2017-04-04	Y170970003	ND
2017-04-04	Y170960008	ND
2017-07-04	Y171870086	ND
2017-08-30	Y172420035	ND
2017-10-03	Y172780005	ND
2017-11-29	Y173340018	ND
2018-04-02	Y180950002	ND
2018-10-01	Y182770008	ND
2019-04-17	Y191080005	ND
2019-10-01	Y192770001	ND