Chromium (total)
Concan Water Supply Corporation
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 | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-01-25 | AE10433 | ND |
| 2018-04-16 | AE22440 | ND |
| 2019-02-28 | AE56483 | ND |
| 2019-02-28 | AE56484 | ND |
| 2020-02-20 | AE99197 | ND |
| 2020-08-12 | AF23139 | ND |
| 2021-02-04 | AF42617 | ND |
| 2021-02-04 | AF42618 | ND |
| 2022-03-08 | AF87953 | ND |
| 2022-08-16 | AG09370 | ND |
| 2023-02-24 | AG30418 | ND |
| 2023-11-06 | AG62324 | ND |