Chromium (total)
Walton Psd
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 | 1 | 0 | ND |
| 2019 | 3.70 ppb | 1 | 1 | 3.70 ppb |
| 2020 | 1.10 ppb | 2 | 2 | 1.10 ppb |
| 2021 | 0.210 ppb | 1 | 1 | 0.210 ppb |
| 2022 | ND | 1 | 0 | ND |
| 2023 | 1.10 ppb | 1 | 1 | 1.10 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 |
|---|---|---|
| 2018-02-13 | 18021650-01AI | ND |
| 2019-05-14 | 19051853-01A | 3.70 ppb |
| 2020-02-11 | 7317502003 | 1.10 ppb |
| 2020-02-11 | 7317502003 | 1.10 ppb |
| 2021-03-09 | 7362920001 | 0.210 ppb |
| 2022-04-12 | 30480915001 | ND |
| 2023-04-11 | 30577596001 | 1.10 ppb |