Chromium (total)
Clark Public Utilities
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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 14 | 0 | ND |
| 2023 | ND | 3 | 0 | ND |
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 |
|---|---|---|
| 2021-06-29 | 4136308 | ND |
| 2021-06-29 | 4136309 | ND |
| 2021-08-02 | 4171193 | ND |
| 2022-03-31 | 4266325 | ND |
| 2022-07-07 | 4329452 | ND |
| 2022-07-07 | 4329454 | ND |
| 2022-07-07 | 4329453 | ND |
| 2022-07-28 | 4328491 | ND |
| 2022-07-28 | 4329448 | ND |
| 2022-08-03 | 4329440 | ND |
| 2022-08-03 | 4329441 | ND |
| 2022-08-03 | 4328492 | ND |
| 2022-08-04 | 4329461 | ND |
| 2022-08-04 | 4329471 | ND |
| 2022-08-04 | 4329468 | ND |
| 2022-08-04 | 4328488 | ND |
| 2022-08-16 | 4364181 | ND |
| 2023-04-06 | 4439682 | ND |
| 2023-06-01 | 4474461 | ND |
| 2023-09-19 | 4531983 | ND |