Chromium (hexavalent)

City of San Clemente

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).

MORE ABOUT THIS CONTAMINANT

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	0.0569 ppb	8	8	0.0300 ppb - 0.0850 ppb
2014	0.0360 ppb	10	8	ND - 0.0530 ppb
2015	0.0885 ppb	4	3	ND - 0.240 ppb
2016	N/A	0	0	N/A
2017	ND	2	0	ND
2018	N/A	0	0	N/A
2019	N/A	0	0	N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date	Lab ID	Result
2013-09-11	3I11048-01A	0.0300 ppb
2013-09-11	3I11048-03A	0.0320 ppb
2013-09-11	3I11048-05A	0.0410 ppb
2013-09-11	3I11048-07A	0.0310 ppb
2013-12-09	3L09134-03A	0.0760 ppb
2013-12-09	3L09134-05A	0.0770 ppb
2013-12-09	3L09134-01A	0.0850 ppb
2013-12-09	3L09134-07A	0.0830 ppb
2014-03-10	4C10057-05A	0.0460 ppb
2014-03-10	4C10057-01A	0.0350 ppb
2014-03-10	4C10057-07A	0.0430 ppb
2014-03-10	4C10057-03A	0.0350 ppb
2014-06-18	4F18051-07A	0.0490 ppb
2014-06-18	4F18051-05A	0.0530 ppb
2014-06-18	4F18051-03A	0.0460 ppb
2014-06-18	4F18051-01A	0.0530 ppb
2014-07-08	1805-004-0900	ND
2014-07-09	1805-021-0905	ND
2015-07-29	5G29085-01A	ND
2015-07-29	5G29085-03A	0.0650 ppb
2015-12-02	5L02070-01A	0.0490 ppb
2015-12-02	5L02070-03A	0.240 ppb
2017-02-08	1805-004-1115	ND
2017-03-08	1805-021-1120	ND