Chromium (total)

Mahwah Water Department

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	ND	4	0	ND
2015	0.259 ppb	16	11	ND - 0.550 ppb
2016	N/A	0	0	N/A
2017	1.000 ppb	4	4	1.000 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
2014-09-12	28846-4	ND
2014-09-12	28846-2	ND
2014-09-12	28846-3	ND
2014-09-12	28846-1	ND
2015-03-03	35178653003AM	0.480 ppb
2015-03-03	35178653005AM	0.480 ppb
2015-03-03	35178653001AM	0.370 ppb
2015-03-03	35178653011AM	0.550 ppb
2015-03-03	35178653007AM	0.410 ppb
2015-03-03	35178653009AM	0.480 ppb
2015-06-11	35193405001AM	ND
2015-06-11	35193405003AM	0.290 ppb
2015-09-09	35207197007AM	0.220 ppb
2015-09-09	35207197005AM	0.280 ppb
2015-09-09	35207197009AM	ND
2015-09-09	35207197001AM	ND
2015-09-09	35207197011AM	0.300 ppb
2015-09-09	35207197003AM	0.280 ppb
2015-12-09	35220717001AM	ND
2015-12-09	35220717003AM	ND
2017-05-17	370517078	1.000 ppb
2017-05-17	370517082	1.000 ppb
2017-05-17	370517080	1.000 ppb
2017-05-17	370517084	1.000 ppb