Chromium (total)
Allendale Water Department
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 | 5.22 ppb | 3 | 3 | 2.97 ppb - 6.46 ppb |
| 2019 | 2.94 ppb | 2 | 2 | 0.696 ppb - 5.19 ppb |
| 2020 | 3.57 ppb | 2 | 2 | 1.82 ppb - 5.31 ppb |
| 2021 | 0.717 ppb | 3 | 3 | 0.655 ppb - 0.811 ppb |
| 2022 | 0.563 ppb | 1 | 1 | 0.563 ppb |
| 2023 | 0.756 ppb | 1 | 1 | 0.756 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 |
|---|---|---|
| 2018-07-16 | 8070628-01 | 6.46 ppb |
| 2018-07-17 | 8070712-02 | 2.97 ppb |
| 2018-07-17 | 8070712-01 | 6.23 ppb |
| 2021-04-08 | 1040421-06 | 0.684 ppb |
| 2021-04-08 | 1040421-01 | 0.811 ppb |
| 2021-04-08 | 1040421-04 | 0.655 ppb |