Chromium (total)
Aquarion Water Company of Connecticut - Mystic
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 | 3 | 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 |
|---|---|---|
| 2018-05-07 | 201806155-IOC1 | ND |
| 2018-05-07 | 201806152-IOCR | ND |
| 2019-05-07 | 201906220-IOC1 | ND |
| 2019-05-07 | 201906217-IOCR | ND |
| 2020-05-04 | 202006226-IOC1 | ND |
| 2020-05-04 | 202006223-IOCR | ND |
| 2021-05-03 | 202106129-IOC1 | ND |
| 2021-05-03 | 202106135-IOC1 | ND |
| 2021-05-03 | 202106126-IOCR | ND |
| 2022-05-02 | 202206699-IOC1 | ND |
| 2022-07-18 | 202212124-IOCR | ND |
| 2023-05-01 | 202306890-IOC1 | ND |
| 2023-05-01 | 202306887-IOCR | ND |