Chromium (total)

Lee County 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	0.155 ppb	26	12	ND - 0.630 ppb
2014	0.840 ppb	5	5	0.700 ppb - 1.10 ppb
2015	2.20 ppb	1	1	2.20 ppb
2016	0.500 ppb	1	1	0.500 ppb
2017	ND	5	0	ND
2018	0.975 ppb	4	4	0.700 ppb - 1.30 ppb
2019	0.250 ppb	2	1	ND - 0.500 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	Result
2013-03-05	0.470 ppb
2013-03-13	0.270 ppb
2013-05-01	0.240 ppb
2013-05-01	0.560 ppb
2013-05-01	ND
2013-05-01	ND
2013-05-01	0.260 ppb
2013-05-02	0.330 ppb
2013-05-02	ND
2013-05-02	ND
2013-05-02	ND
2013-05-02	ND
2013-06-05	0.240 ppb
2013-06-05	0.300 ppb
2013-09-09	ND
2013-09-09	ND
2013-09-09	ND
2013-09-09	ND
2013-09-10	0.200 ppb
2013-09-10	0.630 ppb
2013-09-10	ND
2013-09-10	ND
2013-09-11	0.280 ppb
2013-09-11	0.250 ppb
2013-12-02	ND
2013-12-02	ND
2014-02-05	0.700 ppb
2014-03-03	1.10 ppb
2014-04-16	0.700 ppb
2014-04-16	0.700 ppb
2014-10-08	1.000 ppb
2015-10-12	2.20 ppb
2016-10-03	0.500 ppb
2017-02-01	ND
2017-03-02	ND
2017-04-03	ND
2017-04-03	ND
2017-10-05	ND
2018-06-11	1.10 ppb
2018-07-09	0.700 ppb
2018-10-01	0.800 ppb
2018-10-16	1.30 ppb
2019-01-07	0.500 ppb
2019-10-07	ND