Chromium (total)
Bristol Water Department
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 | 4 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2018-03-07 | D8C0471-01IOCR | ND |
| 2018-03-07 | D8C0468-01IOC | ND |
| 2019-03-27 | D9C2626-01IOCR | ND |
| 2019-05-15 | D9E1655-01IOCR | ND |
| 2019-05-15 | D9E1655-01IOC | ND |
| 2019-10-28 | D9J2582-01IOCR | ND |
| 2020-01-31 | D0A2598-01IOCR | ND |
| 2020-01-31 | D0A2596-04IOC | ND |
| 2020-01-31 | D0A2596-03IOC | ND |
| 2020-01-31 | D0A2596-02IOC | ND |
| 2020-01-31 | D0A2596-01IOC | ND |
| 2021-02-25 | D1B2170-01IOC | ND |
| 2021-12-16 | 21121612-001-IOC | ND |
| 2022-02-03 | D2B0373-01IOC | ND |
| 2022-04-07 | D2D0790-01IOC | ND |
| 2022-05-05 | D2E0587-01IOC | ND |
| 2023-02-23 | D3B2333-01IOC | ND |
| 2023-02-23 | D3B2333-02IOC | ND |
| 2023-02-23 | D3B2333-03IOC | ND |
| 2023-02-23 | D3B2333-04IOC | ND |
| 2023-02-23 | D3B2331-01IOC | ND |