Chromium (hexavalent)
Madison Water Works
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).
12
Samples
0
Samples exceeding legal limit (MCL)
12
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.640 ppb | 6 | 6 | 0.270 ppb - 0.850 ppb |
| 2015 | 0.867 ppb | 6 | 6 | 0.610 ppb - 1.000 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 |
|---|---|---|
| 2014-08-19 | 3086202 | 0.790 ppb |
| 2014-08-19 | 3086354 | 0.850 ppb |
| 2014-08-19 | 3086362 | 0.320 ppb |
| 2014-08-19 | 3086226 | 0.270 ppb |
| 2014-12-17 | 35168426002AM | 0.770 ppb |
| 2014-12-17 | 35168426001AM | 0.840 ppb |
| 2015-02-10 | 35175254007AM | 0.980 ppb |
| 2015-02-10 | 35175254003AM | 0.960 ppb |
| 2015-02-10 | 35175254001AM | 0.710 ppb |
| 2015-02-10 | 35175254005AM | 1.000 ppb |
| 2015-05-14 | 35188657003AM | 0.940 ppb |
| 2015-05-14 | 35188657001AM | 0.610 ppb |