Chromium (total)
Aquarion Water Company of Connecticut - Stamford
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 | 4 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 | 201800021-IOC1 | ND |
| 2018-01-02 | 201800018-IOCR | ND |
| 2019-01-07 | 201900231-IOCR | ND |
| 2019-01-07 | 201900234-IOC1 | ND |
| 2020-01-06 | 202000151-IOCR | ND |
| 2020-01-06 | 202000154-IOC1 | ND |
| 2020-07-06 | 202010216-IOCR | ND |
| 2020-07-06 | 202010220-IOC1 | ND |
| 2021-01-04 | 202100057-IOC1 | ND |
| 2021-01-04 | 202100054-IOCR | ND |
| 2022-01-03 | 202200070-IOCR | ND |
| 2022-01-03 | 202200073-IOC1 | ND |
| 2022-07-18 | 202212143-IOCR | ND |
| 2022-07-18 | 202212142-IOC1 | ND |
| 2023-01-03 | 202300186-IOCR | ND |
| 2023-01-03 | 202300189-IOC1 | ND |
| 2023-08-07 | 202313852-IOCR | ND |
| 2023-08-07 | 202313851-IOC1 | ND |