Chromium (total)
New London Department of Public Utilities
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 | 2 | 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 |
|---|---|---|
| 2018-11-29 | 28420IOC1 | ND |
| 2018-11-29 | 28425IOCR | ND |
| 2019-11-20 | 30473IOC1 | ND |
| 2019-11-20 | 30469IOCR | ND |
| 2020-12-01 | 32746IOC1 | ND |
| 2020-12-01 | 32743IOCR | ND |
| 2021-10-27 | 34801IOC1 | ND |
| 2021-10-27 | 34800IOCR | ND |
| 2022-09-15 | 36582IOC1 | ND |
| 2022-09-15 | 36581IOCR | ND |
| 2023-09-14 | 38752IOC1 | ND |
| 2023-09-14 | 38758IOCR | ND |