Chromium (total)

City of Columbia

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	0.109 ppb	10	4	ND - 0.300 ppb
2015	0.134 ppb	10	5	ND - 0.300 ppb
2016	ND	2	0	ND
2017	ND	3	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
2014-01-15	AD34536	ND
2014-01-15	AD34535	ND
2014-07-14	201407160626AM	ND
2014-07-14	201407160557AM	ND
2014-07-14	201407160604AM	ND
2014-07-14	201407160691AM	ND
2014-10-14	201410160419AM	0.300 ppb
2014-10-14	201410160417AM	0.300 ppb
2014-10-28	201410300184AM	0.230 ppb
2014-10-28	201410300179AM	0.260 ppb
2015-01-13	201501150478AM	ND
2015-01-13	201501150451AM	ND
2015-01-13	201501150661AM	0.200 ppb
2015-01-13	201501150679AM	0.300 ppb
2015-01-15	AD50347	ND
2015-01-15	AD50348	ND
2015-04-14	201504160290AM	0.270 ppb
2015-04-14	201504160447AM	0.300 ppb
2015-04-14	201504160335AM	0.270 ppb
2015-04-14	201504160399AM	ND
2016-01-13	AD69191	ND
2016-01-13	AD69192	ND
2017-01-17	AD88356	ND
2017-03-07	AD90717	ND
2017-08-02	AD98392	ND
2018-03-12	AE09073	ND
2018-07-16	AE15003	ND
2019-01-08	AE23570	ND
2019-07-16	AE33661	ND