Chromium (total)
Bradley Waterworks
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 | 0.860 ppb | 5 | 3 | ND - 1.80 ppb |
| 2019 | ND | 5 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | 14.8 ppb | 3 | 2 | ND - 39.0 ppb |
| 2023 | 24.7 ppb | 2 | 2 | 20.9 ppb - 28.4 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 |
|---|---|---|
| 2018-03-20 | Y180810018 | ND |
| 2018-05-29 | Y181510007 | 1.80 ppb |
| 2018-05-29 | Y181510006 | 1.000 ppb |
| 2018-08-13 | Y182280033 | 1.50 ppb |
| 2018-10-16 | Y182910036 | ND |
| 2019-02-25 | Y190590038 | ND |
| 2019-05-13 | Y191360053 | ND |
| 2019-08-12 | Y192270055 | ND |
| 2019-11-05 | Y193110048 | ND |
| 2019-11-05 | Y193110002 | ND |
| 2020-03-02 | Y200650041 | ND |
| 2020-06-02 | Y201560022 | ND |
| 2020-08-18 | Y202330050 | ND |
| 2020-11-07 | Y203240056 | ND |
| 2021-02-23 | Y210560027 | ND |
| 2021-04-19 | Y211110024 | ND |
| 2021-04-19 | Y211110023 | ND |
| 2021-07-26 | Y212100033 | ND |
| 2021-11-16 | Y213230004 | ND |
| 2022-02-14 | Y220480064 | ND |
| 2022-08-15 | Y222300037 | 39.0 ppb |
| 2022-10-11 | Y222850016 | 5.50 ppb |
| 2023-02-22 | Y230550006 | 20.9 ppb |
| 2023-09-11 | Y232570033 | 28.4 ppb |