Chromium (hexavalent)
Madison Water Utility
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).
58
Samples
0
Samples exceeding legal limit (MCL)
43
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | 0.657 ppb | 58 | 43 | ND - 3.30 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 |
|---|---|---|
| 2015-03-09 | 3201748 | 0.550 ppb |
| 2015-03-09 | 3201796 | 0.700 ppb |
| 2015-03-09 | 3201818 | ND |
| 2015-03-09 | 3201839 | 0.620 ppb |
| 2015-03-09 | 3201807 | ND |
| 2015-03-09 | 3201718 | 1.20 ppb |
| 2015-03-09 | 3201782 | 0.370 ppb |
| 2015-03-09 | 3201688 | 2.00 ppb |
| 2015-03-09 | 3201768 | 1.20 ppb |
| 2015-03-09 | 3201829 | 0.540 ppb |
| 2015-03-10 | 3202428 | ND |
| 2015-03-10 | 3202352 | ND |
| 2015-03-10 | 3202301 | 0.560 ppb |
| 2015-03-10 | 3202404 | 1.30 ppb |
| 2015-03-10 | 3202459 | 0.810 ppb |
| 2015-03-10 | 3202335 | 0.870 ppb |
| 2015-03-10 | 3202312 | 0.0400 ppb |
| 2015-03-10 | 3202472 | 0.840 ppb |
| 2015-03-10 | 3202413 | 1.30 ppb |
| 2015-03-10 | 3202323 | 0.890 ppb |
| 2015-03-10 | 3202384 | 0.520 ppb |
| 2015-03-11 | 3203983 | 0.380 ppb |
| 2015-03-11 | 3203969 | 0.360 ppb |
| 2015-05-19 | 3245228 | ND |
| 2015-05-19 | 3245217 | 0.0500 ppb |
| 2015-05-21 | 3248057 | ND |
| 2015-05-27 | 3250680 | 1.90 ppb |
| 2015-07-08 | 3276581 | 1.10 ppb |
| 2015-07-21 | 3284351 | ND |
| 2015-09-01 | 3313059 | ND |
| 2015-09-14 | 3321384 | 0.840 ppb |
| 2015-09-14 | 3321410 | 1.000 ppb |
| 2015-09-14 | 3321405 | 0.840 ppb |
| 2015-09-15 | 3322689 | 1.20 ppb |
| 2015-09-15 | 3322778 | ND |
| 2015-09-15 | 3322710 | 1.20 ppb |
| 2015-09-15 | 3322762 | 1.30 ppb |
| 2015-09-15 | 3322818 | ND |
| 2015-09-15 | 3322629 | ND |
| 2015-09-15 | 3322752 | 0.500 ppb |
| 2015-09-15 | 3322665 | 0.480 ppb |
| 2015-09-15 | 3322846 | 0.0300 ppb |
| 2015-09-15 | 3322880 | 0.840 ppb |
| 2015-09-15 | 3322866 | 0.820 ppb |
| 2015-09-15 | 3322741 | 2.00 ppb |
| 2015-09-15 | 3322678 | 0.0400 ppb |
| 2015-09-15 | 3322730 | ND |
| 2015-09-16 | 3324046 | ND |
| 2015-09-16 | 3323908 | 0.620 ppb |
| 2015-09-16 | 3324016 | 0.360 ppb |
| 2015-09-16 | 3323919 | 3.30 ppb |
| 2015-09-16 | 3324056 | ND |
| 2015-09-16 | 3323929 | 0.620 ppb |
| 2015-09-16 | 3324076 | ND |
| 2015-09-16 | 3323934 | 1.90 ppb |
| 2015-09-16 | 3323897 | 0.520 ppb |
| 2015-09-16 | 3324008 | 0.400 ppb |
| 2015-12-29 | 3380093 | 1.20 ppb |