Chromium (total)

Lockport

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
2014	0.0250 ppb	16	2	ND - 0.200 ppb
2015	ND	2	0	ND
2016	ND	2	0	ND
2017	ND	1	0	ND
2018	1.06 ppb	5	1	ND - 5.32 ppb
2019	15.0 ppb	2	2	7.61 ppb - 22.4 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	Lab ID	Result
2014-03-11	25047601	ND
2014-03-11	25047701	ND
2014-03-11	25047501	0.200 ppb
2014-03-11	25047201	ND
2014-03-11	25048001	ND
2014-03-11	25047801	ND
2014-03-11	25047901	ND
2014-09-09	27043701	ND
2014-09-09	27043501	ND
2014-09-09	27043301	ND
2014-09-09	27043401	ND
2014-09-09	27043801	ND
2014-10-14	1410732-001A	ND
2014-10-14	1410732-002A	ND
2014-11-12	27697501	ND
2014-11-12	27697401	0.200 ppb
2015-01-20	1501A97-001A	ND
2015-06-16	1506E89-001A	ND
2016-01-26	1601E20-001A	ND
2016-10-04	1610210-001A	ND
2017-10-03	1710136-001A	ND
2018-05-29	1805L12-001A	ND
2018-06-28	18F1260-01_01	ND
2018-06-28	18F1259-01_01	ND
2018-07-18	1807C20-001A	ND
2018-10-23	1810I02-001A	5.32 ppb
2019-02-19	1902C12-001A	22.4 ppb
2019-10-15	1910D01-001A	7.61 ppb