Chromium (total)

Thomson-McDuffie County W&S Comm.

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	0.232 ppb	14	8	ND - 0.520 ppb
2015	0.0450 ppb	6	1	ND - 0.270 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
2014-03-17	AI36087	ND
2014-03-17	AI36086	ND
2014-05-21	35139238003AM	0.410 ppb
2014-05-21	35139238001AM	0.310 ppb
2014-05-21	35139238009AM	0.510 ppb
2014-05-21	35139238007AM	0.520 ppb
2014-08-28	35152912001AM	0.410 ppb
2014-08-28	35152912005AM	0.410 ppb
2014-08-28	35152912007AM	0.340 ppb
2014-08-28	35152912003AM	0.340 ppb
2014-11-30	35166240003AM	ND
2014-11-30	35166240007AM	ND
2014-11-30	35166240005AM	ND
2014-11-30	35166240001AM	ND
2015-02-03	AI64081	ND
2015-02-11	AI64842	ND
2015-02-17	35176235003AM	ND
2015-02-18	35176235007AM	0.270 ppb
2015-02-18	35176235005AM	ND
2015-02-18	35176235001AM	ND
2016-02-17	AJ06689	ND
2016-02-17	AJ06688	ND
2017-01-30	AJ43721	ND
2017-01-30	AJ43720	ND
2018-02-12	AJ83740	ND
2018-02-12	AJ83739	ND
2019-02-13	AK11300	ND
2019-02-13	AK11299	ND