Chromium (total)

City of Durham

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	0.0163 ppb	16	1	ND - 0.260 ppb
2014	ND	2	0	ND
2015	ND	2	0	ND
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
2013-01-14	201301150056AM	ND
2013-01-14	201301150054AM	ND
2013-01-14	201301150049AM	ND
2013-01-14	201301150052AM	ND
2013-04-15	201304160177AM	ND
2013-04-15	201304160058AM	ND
2013-04-15	201304160179AM	ND
2013-04-15	201304160192AM	0.260 ppb
2013-07-15	201307160505AM	ND
2013-07-15	201307160246AM	ND
2013-07-15	201307160495AM	ND
2013-08-01	201308020093AM	ND
2013-10-14	201310150063AM	ND
2013-10-14	201310150050AM	ND
2013-10-14	201310150031AM	ND
2013-10-14	201310150043AM	ND
2014-02-03	IOA02032014WP	ND
2014-02-03	IOA02032014BP	ND
2015-02-02		ND
2015-02-02		ND
2016-02-15	37658_160218_149	ND
2016-02-15	37658_160218_149	ND
2017-04-03	37658_170410_328	ND
2017-04-03	37658_170410_328	ND
2018-09-04	37658_181008_577	ND
2018-09-04	37658_181008_577	ND
2019-02-04	37658_190207_629	ND
2019-02-04	37658_190207_629	ND