Chromium (total)

Tri-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	Range of results
2014	N/A	0	N/A
2015	ND	8	ND
2016	N/A	0	N/A
2017	N/A	0	N/A
2018	ND	24	ND
2019	N/A	0	N/A

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
2015-08-17	35203189006	ND
2015-08-17	35203189005	ND
2015-08-17	35203189004	ND
2015-08-17	35203189003	ND
2015-08-17	35203189006	ND
2015-08-17	35203189005	ND
2015-08-17	35203189004	ND
2015-08-17	35203189003	ND
2018-05-02	35390243003	ND
2018-05-02	35390243001	ND
2018-05-02	35390243004	ND
2018-05-02	35390243002	ND
2018-05-02	35390243001	ND
2018-05-02	35390243002	ND
2018-05-02	35390243003	ND
2018-05-02	35390243004	ND
2018-05-15	35392915001	ND
2018-05-15	35392915008	ND
2018-05-15	35392915007	ND
2018-05-15	35392915006	ND
2018-05-15	35392915005	ND
2018-05-15	35392915004	ND
2018-05-15	35392915003	ND
2018-05-15	35392915002	ND
2018-05-15	35392915001	ND
2018-05-15	35392915008	ND
2018-05-15	35392915007	ND
2018-05-15	35392915006	ND
2018-05-15	35392915005	ND
2018-05-15	35392915004	ND
2018-05-15	35392915003	ND
2018-05-15	35392915002	ND