Chromium (hexavalent)

SBDNO County Service Area 64

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	0.935 ppb	12	12	0.0760 ppb - 1.70 ppb
2014	0.375 ppb	4	1	ND - 1.50 ppb
2015	1.47 ppb	6	3	ND - 5.40 ppb
2016	N/A	0	0	N/A
2017	2.50 ppb	1	1	2.50 ppb
2018	N/A	0	0	N/A
2019	ND	4	0	ND

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
2013-03-27	B3C2917-03	0.440 ppb
2013-03-27	B3C2917-09	1.70 ppb
2013-03-27	B3C2917-11	1.60 ppb
2013-03-27	B3C2917-07	0.620 ppb
2013-03-27	B3C2917-01	1.70 ppb
2013-04-18	B3D2026-01	0.0870 ppb
2013-09-19	B3I1975-03	0.0760 ppb
2013-09-19	B3I1975-05	0.140 ppb
2013-09-19	B3I1975-07	1.70 ppb
2013-09-19	B3I1975-09	1.50 ppb
2013-09-19	B3I1975-01	0.260 ppb
2013-09-19	B3I1975-11	1.40 ppb
2014-10-01	3761-004-1055	ND
2014-10-01	3761-005-0935	1.50 ppb
2014-10-01	3761-002-1015	ND
2014-10-01	3761-001-1145	ND
2015-04-01	3761-001-1335	ND
2015-04-01	3761-005-1035	1.80 ppb
2015-04-01	3761-004-1145	ND
2015-04-01	3761-002-1115	ND
2015-07-30	3761-006-1525	5.40 ppb
2015-07-31	3761-006-1500	1.60 ppb
2017-01-03	3761-005-1015	2.50 ppb
2019-01-07	3761-002-1010	ND
2019-01-07	3761-001-1110	ND
2019-01-17	3761-006-0950	ND
2019-01-29	3761-004-1030	ND