Chromium (hexavalent)
Northwest Utilities
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).
24
Samples
0
Samples exceeding legal limit (MCL)
22
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.0593 ppb | 6 | 5 | ND - 0.0820 ppb |
| 2014 | 0.0723 ppb | 18 | 17 | ND - 0.150 ppb |
| 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 | Result |
|---|---|
| 2013-10-23 | 0.0660 ppb |
| 2013-10-23 | 0.0820 ppb |
| 2013-10-23 | 0.0670 ppb |
| 2013-10-23 | 0.0620 ppb |
| 2013-10-23 | ND |
| 2013-10-23 | 0.0790 ppb |
| 2014-01-14 | 0.0930 ppb |
| 2014-01-14 | 0.0920 ppb |
| 2014-01-14 | 0.0780 ppb |
| 2014-01-14 | 0.0690 ppb |
| 2014-01-14 | 0.0690 ppb |
| 2014-01-14 | 0.150 ppb |
| 2014-04-29 | 0.0560 ppb |
| 2014-04-29 | 0.0940 ppb |
| 2014-04-29 | 0.0670 ppb |
| 2014-04-29 | 0.0490 ppb |
| 2014-04-29 | 0.0440 ppb |
| 2014-04-30 | 0.0610 ppb |
| 2014-07-14 | 0.120 ppb |
| 2014-07-14 | 0.0430 ppb |
| 2014-07-14 | 0.0390 ppb |
| 2014-07-14 | 0.0370 ppb |
| 2014-07-14 | ND |
| 2014-07-14 | 0.140 ppb |