Chromium (total)

City of Corsicana

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	0.353 ppb	18	4	ND - 3.10 ppb
2015	0.835 ppb	2	2	0.820 ppb - 0.850 ppb
2016	0.625 ppb	2	2	0.420 ppb - 0.830 ppb
2017	0.500 ppb	2	1	ND - 1.000 ppb
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
2014-04-14	4D15022-07	ND
2014-04-14	4D15022-05	ND
2014-04-14	4D15022-01	ND
2014-04-14	4D15022-03	ND
2014-05-15	Q1416551004	2.80 ppb
2014-05-15	Q1416551003	3.10 ppb
2014-06-03	4F04044-01	ND
2014-06-03	4F04044-04	ND
2014-06-03	4F04044-07	ND
2014-06-03	4F04044-09	ND
2014-09-03	4I04031-07	ND
2014-09-03	4I04031-09	ND
2014-09-03	4I04031-01	0.250 ppb
2014-09-03	4I04031-04	ND
2014-12-02	4L03007-09	ND
2014-12-02	4L03007-07	ND
2014-12-02	4L03007-01	ND
2014-12-02	4L03007-04	0.202 ppb
2015-01-28	Q1503409004	0.850 ppb
2015-01-28	Q1503409003	0.820 ppb
2016-02-02	Q1604417004	0.420 ppb
2016-02-02	Q1604417003	0.830 ppb
2017-01-17	Q1702000001	1.000 ppb
2017-07-26	Q1730737003	ND
2018-01-31	Q1803716002	ND
2018-01-31	Q1803716008	ND
2019-01-10	Q1901447003	ND
2019-01-10	Q1901447001	ND