Chromium (total)

Seabrook 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
2013	0.270 ppb	10	8	ND - 0.480 ppb
2014	ND	1	0	ND
2015	ND	4	0	ND
2016	N/A	0	0	N/A
2017	3.45 ppb	1	1	3.45 ppb
2018	1.75 ppb	4	4	1.000 ppb - 2.50 ppb
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
2013-06-16	1032450008	ND
2013-06-16	1032450010	0.330 ppb
2013-06-16	1032450003	0.290 ppb
2013-06-16	1032450001	0.240 ppb
2013-06-16	1032450005	ND
2013-11-20	1059785006	0.260 ppb
2013-11-20	1059785009	0.420 ppb
2013-11-20	1059785012	0.480 ppb
2013-11-20	1059785003	0.350 ppb
2013-11-20	1059785001	0.330 ppb
2014-02-11	1402-00182-001	ND
2015-05-07	1505-00683-001	ND
2015-08-24	1508-01936-001	ND
2015-08-31	1508-02456-001	ND
2015-08-31	1508-02459-001	ND
2017-02-02	1702-00229-001	3.45 ppb
2018-05-15	1805-01980-001	1.60 ppb
2018-07-23	1807-02894-001	1.000 ppb
2018-07-23	1807-02882-001	1.90 ppb
2018-07-23	1807-02878-001	2.50 ppb