Chromium (total)
Reading Area Water Authority
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 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 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 |
|---|---|---|
| 2018-01-02 | 8000188-01 | ND |
| 2019-01-29 | 9000974-01 | ND |
| 2019-08-28 | 9029428-01 | ND |
| 2020-01-21 | 21541505.00 | ND |
| 2020-07-20 | 22651079.00 | ND |
| 2021-01-12 | 23752898.00 | ND |
| 2021-07-06 | 24682698.00 | ND |
| 2022-01-04 | 25805858.00 | ND |
| 2022-07-12 | 27082272.00 | ND |
| 2023-01-03 | 28038904.00 | ND |
| 2023-03-24 | 28563642.00 | ND |
| 2023-04-13 | 28748057.00 | ND |