Chromium (total)
Western Cass Water Supply Corporation
Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 2 | 0 | ND |
| 2019 | 0.400 ppb | 3 | 1 | ND - 1.20 ppb |
| 2020 | ND | 1 | 0 | ND |
| 2021 | 0.750 ppb | 2 | 1 | ND - 1.50 ppb |
| 2022 | ND | 3 | 0 | ND |
| 2023 | 8.50 ppb | 1 | 1 | 8.50 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EPA Maximum Contaminant
Level (MCL): 100 ppb
The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-08 | Q1809687016 | ND |
| 2018-03-08 | Q1809687017 | ND |
| 2019-05-02 | Q1918236012 | ND |
| 2019-05-02 | Q1918236013 | 1.20 ppb |
| 2019-05-02 | Q1918236014 | ND |
| 2020-03-19 | Q2011997016 | ND |
| 2021-10-25 | Q2129911020 | 1.50 ppb |
| 2021-10-25 | Q2129911027 | ND |
| 2022-04-14 | Q2211593001 | ND |
| 2022-04-14 | Q2211593002 | ND |
| 2022-11-16 | Q2234548004 | ND |
| 2023-08-01 | Q2331111011 | 8.50 ppb |