Chromium (hexavalent)

City of Tumwater

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	0.300 ppb	11	11	0.159 ppb - 0.551 ppb
2015	0.300 ppb	11	11	0.161 ppb - 0.574 ppb
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
2014-08-13	WA97-SE1-14-1551	0.551 ppb
2014-08-13	WA97-SE1-14-1551	0.339 ppb
2014-08-13	WA97-SE1-14-1551	0.275 ppb
2014-08-13	WA97-SE1-14-1551	0.346 ppb
2014-08-13	WA97-SE1-14-1551	0.497 ppb
2014-08-20	WA97-SE1-14-1640	0.268 ppb
2014-08-20	WA97-SE1-14-1640	0.160 ppb
2014-08-20	WA97-SE1-14-1640	0.278 ppb
2014-08-20	WA97-SE1-14-1640	0.265 ppb
2014-08-20	WA97-SE1-14-1640	0.159 ppb
2014-08-20	WA97-SE1-14-1640	0.160 ppb
2015-02-11	WA97-SE2-15-0270	0.323 ppb
2015-02-11	WA97-SE1-15-0270	0.574 ppb
2015-02-11	WA97-SE1-15-0270	0.162 ppb
2015-02-11	WA97-SE2-15-0270	0.253 ppb
2015-02-11	WA97-SE2-15-0270	0.324 ppb
2015-02-11	WA97-SE1-15-0270	0.532 ppb
2015-02-11	WA97-SE2-15-0270	0.217 ppb
2015-02-11	WA97-SE2-15-0270	0.227 ppb
2015-02-11	WA97-SE2-15-0270	0.367 ppb
2015-02-11	WA97-SE2-15-0270	0.161 ppb
2015-02-11	WA97-SE2-15-0270	0.161 ppb