Know Your Environment. Protect Your Health.

Chromium (hexavalent)

City of Tacoma

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).

 

25

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.260 ppb110.260 ppb
20150.160 ppb2421ND - 0.310 ppb
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A
2020N/A00N/A
2021N/A00N/A
2022N/A00N/A
2023N/A00N/A

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2014-08-06201408070493AM0.260 ppb
2015-03-10201503120179AM0.260 ppb
2015-03-10201503110935AM0.230 ppb
2015-03-10201502170548AM0.0510 ppb
2015-03-17201503190039AM0.120 ppb
2015-06-09201505060001AM0.0550 ppb
2015-06-09201505060002AM0.210 ppb
2015-06-17201505060005AM0.310 ppb
2015-06-29201505020034AM0.270 ppb
2015-07-06201505020035AM0.230 ppb
2015-07-08201507090318AM0.240 ppb
2015-07-09201506300092AMND
2015-07-09201507100395AM0.130 ppb
2015-08-19201508200778AMND
2015-09-09201508050010AM0.290 ppb
2015-09-09201508050009AM0.0400 ppb
2015-09-09201508050013AM0.150 ppb
2015-10-20201510210587AM0.230 ppb
2015-12-01201511130083AM0.0970 ppb
2015-12-01201511130086AM0.210 ppb
2015-12-02201511130082AM0.0660 ppb
2015-12-07201511130096AMND
2015-12-07201511130099AM0.160 ppb
2015-12-08201511130098AM0.270 ppb
2015-12-08201511130097AM0.230 ppb