Chromium (hexavalent)
City of Black Hawk
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).
16
Samples
0
Samples exceeding legal limit (MCL)
16
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.123 ppb | 4 | 4 | 0.0970 ppb - 0.168 ppb |
| 2014 | 0.0964 ppb | 12 | 12 | 0.0440 ppb - 0.125 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 |
|---|---|
| 2013-10-15 | 0.168 ppb |
| 2013-10-15 | 0.0970 ppb |
| 2013-10-15 | 0.125 ppb |
| 2013-10-15 | 0.102 ppb |
| 2014-01-07 | 0.116 ppb |
| 2014-01-07 | 0.117 ppb |
| 2014-01-07 | 0.108 ppb |
| 2014-01-07 | 0.0930 ppb |
| 2014-04-07 | 0.1000 ppb |
| 2014-04-07 | 0.106 ppb |
| 2014-04-07 | 0.125 ppb |
| 2014-04-07 | 0.0950 ppb |
| 2014-07-22 | 0.0810 ppb |
| 2014-07-22 | 0.0440 ppb |
| 2014-07-22 | 0.0600 ppb |
| 2014-07-22 | 0.112 ppb |