Chromium (total)
Aquarion Water Company of Connecticut - Main 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 | 6 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
| 2020 | ND | 8 | 0 | ND |
| 2021 | ND | 6 | 0 | ND |
| 2022 | ND | 6 | 0 | ND |
| 2023 | ND | 6 | 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 |
|---|---|---|
| 2018-02-05 | 201801570-IOC1 | ND |
| 2018-02-05 | 201801604-IOC1 | ND |
| 2018-02-05 | 201801603-IOCR | ND |
| 2018-02-05 | 201801571-IOCR | ND |
| 2018-02-05 | 201801587-IOCR | ND |
| 2018-02-05 | 201801586-IOC1 | ND |
| 2019-02-04 | 201901554-IOC1 | ND |
| 2019-02-04 | 201901581-IOC1 | ND |
| 2019-02-04 | 201901613-IOC1 | ND |
| 2019-02-04 | 201901614-IOCR | ND |
| 2019-02-04 | 201901582-IOCR | ND |
| 2019-02-04 | 201901553-IOCR | ND |
| 2020-02-03 | 202001681-IOC1 | ND |
| 2020-02-03 | 202001624-IOC1 | ND |
| 2020-02-03 | 202001640-IOC1 | ND |
| 2020-02-03 | 202001641-IOCR | ND |
| 2020-02-03 | 202001625-IOCR | ND |
| 2020-02-03 | 202001680-IOCR | ND |
| 2020-07-07 | 202010253-IOC1 | ND |
| 2020-07-07 | 202010259-IOC1 | ND |
| 2021-02-02 | 202101448-IOC1 | ND |
| 2021-02-02 | 202101394-IOC1 | ND |
| 2021-02-02 | 202101406-IOC1 | ND |
| 2021-02-02 | 202101407-IOCR | ND |
| 2021-02-02 | 202101395-IOCR | ND |
| 2021-02-02 | 202101447-IOCR | ND |
| 2022-02-07 | 202202033-IOC1 | ND |
| 2022-02-07 | 202202089-IOCR | ND |
| 2022-02-07 | 202202023-IOCR | ND |
| 2022-02-07 | 202202034-IOCR | ND |
| 2022-02-07 | 202202022-IOC1 | ND |
| 2022-02-07 | 202202090-IOC1 | ND |
| 2023-02-06 | 202301854-IOC1 | ND |
| 2023-02-06 | 202301775-IOC1 | ND |
| 2023-02-06 | 202301771-IOCR | ND |
| 2023-02-06 | 202301853-IOCR | ND |
| 2023-02-09 | 202302139-IOC1 | ND |
| 2023-02-09 | 202302140-IOCR | ND |