Chromium (total)
Aquarion Water Company of Connecticut - Valley 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 | 25 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | 0.0417 ppb | 24 | 1 | ND - 1.000 ppb |
| 2021 | 0.0357 ppb | 28 | 1 | ND - 1.000 ppb |
| 2022 | ND | 3 | 0 | ND |
| 2023 | 0.214 ppb | 14 | 2 | ND - 2.00 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 |
|---|---|---|
| 2019-02-05 | 201901652-IOC1 | ND |
| 2019-02-05 | 201901650-IOC1 | ND |
| 2019-12-16 | 201920349-IOC1 | ND |
| 2022-02-08 | 202202217-IOC1 | ND |
| 2022-02-08 | 202202215-IOC1 | ND |
| 2022-02-08 | 202202211-IOC1 | ND |