Chromium (total)

Hartland Waterworks

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	0.262 ppb	19	12	ND - 1.20 ppb
2015	1.20 ppb	1	1	1.20 ppb
2016	ND	1	0	ND
2017	0.360 ppb	5	2	ND - 1.40 ppb
2018	N/A	0	0	N/A
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
2014-01-22	2961271-72	ND
2014-02-06	2968595-96	ND
2014-02-24	2979694-95	ND
2014-02-26	2981933-34	ND
2014-02-27	2982697-98	1.20 ppb
2014-05-19	106987P	ND
2014-05-19	307061P	0.330 ppb
2014-05-19	307060P	0.279 ppb
2014-05-19	106991P	0.278 ppb
2014-05-20	106990P	0.251 ppb
2014-05-20	106988P	0.497 ppb
2014-05-20	106989P	0.396 ppb
2014-11-17	109719P	0.225 ppb
2014-11-18	109716P	ND
2014-11-18	109720P	0.406 ppb
2014-11-19	309789P	ND
2014-11-19	309790P	0.289 ppb
2014-11-19	109718P	0.377 ppb
2014-11-20	109717P	0.443 ppb
2015-02-04	3181049,53	1.20 ppb
2016-01-28	903267	ND
2017-02-07	972671	ND
2017-02-07	972674	0.400 ppb
2017-02-13	973350	ND
2017-02-13	973353	1.40 ppb
2017-04-18	983888	ND
2019-03-06	1108215	ND
2019-03-06	1108212	ND