Chromium (total)

City of Lancaster

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	0.248 ppb	8	6	ND - 0.430 ppb
2014	0.236 ppb	10	7	ND - 0.480 ppb
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
2013-07-17	1037985005	ND
2013-07-17	1037985003	ND
2013-07-17	1037985001	0.310 ppb
2013-07-17	1037985008	0.250 ppb
2013-10-08	1052454001	0.340 ppb
2013-10-08	1052454009	0.300 ppb
2013-10-08	1052454007	0.430 ppb
2013-10-08	1052454004	0.350 ppb
2014-02-25	1073427003	0.240 ppb
2014-02-25	1073427007	0.350 ppb
2014-02-25	1073427005	0.480 ppb
2014-02-25	1073427001	ND
2014-04-16	2002339005	0.300 ppb
2014-04-16	2002339008	0.370 ppb
2014-04-16	2002339001	0.370 ppb
2014-04-16	2002339003	0.250 ppb
2014-04-22	2003194001	ND
2014-04-22	2003194002	ND
2015-04-10	12720730	ND
2015-04-10	12720718	ND
2016-05-23	14530706	ND
2016-05-23	14530718	ND
2017-07-19	16529328	ND
2017-07-19	16529327	ND
2018-04-23	2311696002	ND
2018-04-23	2311696001	ND
2019-01-31	3013972003	ND
2019-01-31	3013972001	ND