Chromium (hexavalent)

Montara Water and Sanitary District

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
2014	ND	6	0	ND
2015	0.0225 ppb	16	3	ND - 0.192 ppb
2016	ND	2	0	ND
2017	N/A	0	0	N/A
2018	ND	3	0	ND
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
2014-04-21	1233-030-1050	ND
2014-04-21	1233-031-1030	ND
2014-04-21	1233-032-1100	ND
2014-10-20	1233-030-1020	ND
2014-10-20	1233-031-1010	ND
2014-10-20	1233-032-1025	ND
2015-01-20	311085P	0.192 ppb
2015-01-20	110993P	0.109 ppb
2015-01-20	110989P	0.0588 ppb
2015-01-20	311086P	ND
2015-01-20	110992P	ND
2015-01-20	110991P	ND
2015-01-20	110990P	ND
2015-01-20	110988P	ND
2015-01-20	110987P	ND
2015-01-20	110986P	ND
2015-01-20	110985P	ND
2015-02-18	112413R	ND
2015-11-23	5810-014-1030	ND
2015-11-23	5810-008-1345	ND
2015-11-23	5810-003-1020	ND
2015-12-23	5810-012-0900	ND
2016-01-28	5810-011-0930	ND
2016-03-10	5810-011-1125	ND
2018-11-13	5810-014-0905	ND
2018-11-13	5810-008-0955	ND
2018-11-13	5810-003-0900	ND