Chromium (total)

City of Mount Airy

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	0.226 ppb	10	7	ND - 0.380 ppb
2015	0.0570 ppb	10	2	ND - 0.310 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
2014-02-28	779718I	ND
2014-02-28	779717I	ND
2014-08-26	35152368007AM	0.380 ppb
2014-08-26	35152368003AM	0.370 ppb
2014-08-26	35152368001AM	0.250 ppb
2014-08-26	35152368004AM	0.300 ppb
2014-11-04	35162484005AM	0.370 ppb
2014-12-16	35168209005AM	0.220 ppb
2014-12-16	35168209001AM	ND
2014-12-16	35168209003AM	0.370 ppb
2015-02-10		ND
2015-02-10		ND
2015-02-25	35177225007AM	ND
2015-02-25	35177225005AM	ND
2015-02-25	35177225001AM	ND
2015-02-25	35177225003AM	ND
2015-06-30	35195368003AM	ND
2015-06-30	35195368001AM	ND
2015-06-30	35195368005AM	0.310 ppb
2015-06-30	35195368007AM	0.260 ppb
2016-01-29	14400-02	ND
2016-01-29	14400-01	ND
2017-01-31	30295-01	ND
2017-01-31	30295-07	ND
2018-01-30	45855-04	ND
2018-01-30	45855-01	ND
2019-01-29	62217-04	ND
2019-01-29	62217-01	ND