Chromium (total)

Westchester Joint Water Works

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	0.139 ppb	12	6	ND - 0.310 ppb
2015	0.0420 ppb	5	1	ND - 0.210 ppb
2016	ND	2	0	ND
2017	ND	2	0	ND
2018	ND	2	0	ND
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
2014-03-17	AQ04608INP	ND
2014-04-16	35134968001AM	ND
2014-04-16	35134968003AM	ND
2014-04-16	35134968005AM	0.210 ppb
2014-07-10	35146146001AM	0.310 ppb
2014-07-10	35146146003AM	0.310 ppb
2014-07-10	35146146005AM	0.310 ppb
2014-10-14	35159848003AM	ND
2014-10-14	35159848005AM	0.300 ppb
2014-10-14	35159848001AM	0.230 ppb
2014-10-28	AQ22297INP	ND
2014-10-28	AQ22296INP	ND
2015-01-21	35172677001AM	ND
2015-01-21	35172677003AM	ND
2015-03-04	35178651001AM	0.210 ppb
2015-10-27	AR23147INP	ND
2015-10-27	AR23146INP	ND
2016-10-25	AS22857INP	ND
2016-10-25	AS22858INP	ND
2017-10-30	AT22855INP	ND
2017-10-30	AT22854INP	ND
2018-10-24	AU23139INP	ND
2018-10-24	AU23137INP	ND
2019-10-21	AV22257INP	ND
2019-10-21	AV22256INP	ND