Chromium (total)
Aquarion Water Company of Connecticut - Greenwich System
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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 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 |
|---|---|---|
| 2018-04-02 | 201803870-IOCR | ND |
| 2018-04-02 | 201803873-IOC1 | ND |
| 2018-10-01 | 201815017-IOC1 | ND |
| 2018-10-01 | 201815016-IOCR | ND |
| 2019-04-01 | 201904114-IOC1 | ND |
| 2019-04-01 | 201904109-IOC1 | ND |
| 2019-04-01 | 201904111-IOCR | ND |
| 2019-04-01 | 201904110-IOCR | ND |
| 2020-04-06 | 202004726-IOC1 | ND |
| 2020-04-06 | 202004727-IOCR | ND |
| 2020-04-07 | 202004860-IOC1 | ND |
| 2020-04-07 | 202004857-IOCR | ND |
| 2021-04-05 | 202104315-IOC1 | ND |
| 2021-04-05 | 202104312-IOCR | ND |
| 2021-05-10 | 202106584-IOC1 | ND |
| 2021-05-10 | 202106585-IOCR | ND |
| 2022-04-05 | 202204953-IOC1 | ND |
| 2022-04-05 | 202204950-IOCR | ND |
| 2022-05-16 | 202207710-IOC1 | ND |
| 2022-05-16 | 202207707-IOCR | ND |
| 2023-04-03 | 202304838-IOC1 | ND |
| 2023-04-03 | 202304835-IOCR | ND |
| 2023-06-06 | 202309335-IOC1 | ND |
| 2023-06-06 | 202309336-IOCR | ND |