Chromium (total)

Hilo

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.

MORE ABOUT THIS CONTAMINANT

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	0.851 ppb	8	8	0.710 ppb - 1.000 ppb
2014	0.600 ppb	12	8	ND - 1.10 ppb
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	0.260 ppb	5	1	ND - 1.30 ppb
2018	N/A	0	0	N/A
2019	N/A	0	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
2013-09-23	201309250031AM	0.840 ppb
2013-09-23	201309250035AM	0.850 ppb
2013-09-23	201309250118AM	0.980 ppb
2013-09-23	201309250121AM	0.850 ppb
2013-09-23	201309250113AM	0.860 ppb
2013-09-23	201309250037AM	0.710 ppb
2013-09-23	201309250130AM	0.720 ppb
2013-09-23	201309250033AM	1.000 ppb
2014-01-22	C14-01-0046	ND
2014-01-22	C14-01-0047	ND
2014-01-22	C14-01-0048	ND
2014-01-22	C14-01-0045	ND
2014-03-24	201403260456AM	0.880 ppb
2014-03-24	201403260442AM	0.880 ppb
2014-03-24	201403260446AM	0.770 ppb
2014-03-24	201403260462AM	1.10 ppb
2014-03-24	201403260451AM	1.000 ppb
2014-03-24	201403260471AM	0.900 ppb
2014-03-24	201403260453AM	0.770 ppb
2014-03-24	201403260469AM	0.900 ppb
2017-03-14		ND
2017-03-14		ND
2017-03-14		ND
2017-03-14		ND
2017-05-09		1.30 ppb