Chromium (hexavalent)
Clearwater Water System
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).
17
Samples
0
Samples exceeding legal limit (MCL)
15
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.0483 ppb | 7 | 7 | 0.0330 ppb - 0.0610 ppb |
| 2014 | 0.0617 ppb | 9 | 8 | ND - 0.1000 ppb |
| 2015 | ND | 1 | 0 | ND |
| 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 |
|---|---|
| 2013-12-06 | 0.0500 ppb |
| 2013-12-10 | 0.0380 ppb |
| 2013-12-11 | 0.0330 ppb |
| 2013-12-16 | 0.0610 ppb |
| 2013-12-16 | 0.0550 ppb |
| 2013-12-17 | 0.0490 ppb |
| 2013-12-18 | 0.0520 ppb |
| 2014-04-10 | 0.0540 ppb |
| 2014-06-23 | 0.0740 ppb |
| 2014-06-23 | 0.0440 ppb |
| 2014-06-23 | 0.0660 ppb |
| 2014-06-24 | 0.0780 ppb |
| 2014-06-24 | ND |
| 2014-06-24 | 0.0680 ppb |
| 2014-09-24 | 0.1000 ppb |
| 2014-09-24 | 0.0710 ppb |
| 2015-08-05 | ND |