Chromium (total)

Dennis Water District

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	0.174 ppb	26	13	ND - 0.690 ppb
2015	ND	10	0	ND
2016	N/A	0	0	N/A
2017	ND	2	0	ND
2018	ND	7	0	ND
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	Result
2014-03-17	ND
2014-03-17	ND
2014-04-15	ND
2014-04-15	ND
2014-04-15	ND
2014-04-15	ND
2014-04-15	ND
2014-04-15	ND
2014-04-15	ND
2014-04-15	ND
2014-04-15	0.240 ppb
2014-04-15	0.220 ppb
2014-04-15	ND
2014-04-15	ND
2014-10-15	0.300 ppb
2014-10-15	0.200 ppb
2014-10-15	0.340 ppb
2014-10-15	0.310 ppb
2014-10-15	0.390 ppb
2014-10-15	0.330 ppb
2014-10-15	0.690 ppb
2014-10-15	0.630 ppb
2014-10-15	0.410 ppb
2014-10-15	0.250 ppb
2014-10-15	0.210 ppb
2014-11-12	ND
2015-03-11	ND
2015-03-11	ND
2015-03-11	ND
2015-03-11	ND
2015-05-27	ND
2015-05-27	ND
2015-05-27	ND
2015-07-14	ND
2015-07-14	ND
2015-09-15	ND
2017-02-02	ND
2017-05-19	ND
2018-06-04	ND
2018-06-04	ND
2018-06-04	ND
2018-06-04	ND
2018-06-04	ND
2018-08-15	ND
2018-08-23	ND