Chromium (total)

Newhall CWD-Newhall

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	0.686 ppb	10	10	0.280 ppb - 1.10 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
2013-02-21	201302210758AM	0.820 ppb
2013-02-21	201302210760AM	0.540 ppb
2013-02-21	201302210756AM	1.10 ppb
2013-05-16	201305160550AM	0.280 ppb
2013-05-16	201305160497AM	0.800 ppb
2013-08-22	201308220425AM	0.340 ppb
2013-08-22	201308220423AM	0.840 ppb
2013-08-22	201308220427AM	1.10 ppb
2013-11-21	201311220104AM	0.400 ppb
2013-11-21	201311220118AM	0.640 ppb
2014-04-10	9590-007-0936	ND
2014-05-29	9590-006-0955	ND
2015-04-29	9590-006-1120	ND
2015-04-29	9590-007-1145	ND
2016-04-14	9590-007-1045	ND
2016-04-14	9590-006-1105	ND
2017-04-13	9590-007-0911	ND
2017-04-13	9590-006-0940	ND
2018-04-12	9590-007-1235	ND
2018-04-12	9590-006-1225	ND
2019-04-18	9590-007-0855	ND
2019-04-18	9590-006-0835	ND