Chromium (total)

Riverhead WD

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	0.458 ppb	12	7	ND - 2.60 ppb
2014	0.536 ppb	12	8	ND - 2.60 ppb
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	N/A	0	0	N/A
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
2013-09-18	201309200390AM	0.250 ppb
2013-09-18	201309200396AM	0.240 ppb
2013-09-18	201309200394AM	2.60 ppb
2013-09-18	201309200384AM	ND
2013-09-18	201309200398AM	ND
2013-09-18	201309200392AM	0.710 ppb
2013-09-18	201309200388AM	0.580 ppb
2013-09-18	201309200382AM	ND
2013-09-18	201309200386AM	ND
2013-09-20	201309240332AM	0.370 ppb
2013-09-20	201309240328AM	ND
2013-09-20	201309240330AM	0.750 ppb
2014-03-19	35131088001AM	ND
2014-03-19	35131088003AM	2.60 ppb
2014-03-19	35131088007AM	ND
2014-03-19	35131088005AM	0.720 ppb
2014-03-19	35131088009AM	1.10 ppb
2014-03-21	35132089005AM	0.440 ppb
2014-03-21	35132089001AM	0.280 ppb
2014-03-21	35132089003AM	0.240 ppb
2014-03-21	35132089006AM	0.260 ppb
2014-03-26	35131983001AM	ND
2014-03-26	35131983003AM	ND
2014-03-28	35132127001AM	0.790 ppb