Chromium (hexavalent)

City of Olympia

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	0.197 ppb	20	18	ND - 0.297 ppb
2014	N/A	0	0	N/A
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	N/A	0	0	N/A
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
2013-02-14	WA97-SE1-13-0262	0.266 ppb
2013-02-14	WA97-SE1-13-0262	0.287 ppb
2013-05-20	WA97-SE1-13-0868	ND
2013-05-20	WA97-SE1-13-0868	0.106 ppb
2013-05-20	WA97-SE1-13-0868	0.166 ppb
2013-05-20	WA97-SE2-13-0868	0.278 ppb
2013-05-20	WA97-SE1-13-0868	0.178 ppb
2013-05-20	WA97-SE1-13-0868	0.133 ppb
2013-05-20	WA97-SE2-13-0868	0.297 ppb
2013-05-20	WA97-SE1-13-0868	0.211 ppb
2013-08-05	WA97-SE3-13-1409	0.284 ppb
2013-08-05	WA97-SE3-13-1409	0.269 ppb
2013-11-13	WA97-SE2-13-2166	0.195 ppb
2013-11-13	WA97-SE2-13-2166	ND
2013-11-13	WA97-SE2-13-2166	0.248 ppb
2013-11-13	WA97-SE2-13-2166	0.153 ppb
2013-11-13	WA97-SE4-13-2166	0.263 ppb
2013-11-13	WA97-SE4-13-2166	0.281 ppb
2013-11-13	WA97-SE2-13-2166	0.158 ppb
2013-11-13	WA97-SE2-13-2166	0.173 ppb