Chromium (total)
Belmont Waterworks Inc.
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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | 6.67 ppb | 3 | 1 | ND - 20.0 ppb |
| 2021 | 2.65 ppb | 2 | 1 | ND - 5.30 ppb |
| 2022 | ND | 2 | 0 | ND |
| 2023 | 2.26 ppb | 5 | 2 | ND - 6.20 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 |
|---|---|---|
| 2020-03-02 | B2001159-001 | ND |
| 2020-03-02 | B2001159-002 | 20.0 ppb |
| 2020-03-02 | B2001159-003 | ND |
| 2021-07-14 | B2103192-001 | 5.30 ppb |
| 2021-10-05 | B2105321-001 | ND |
| 2022-02-01 | B2200515-001 | ND |
| 2022-05-11 | B2202359-001 | ND |
| 2023-04-10 | B2301575-001 | ND |
| 2023-04-10 | B2301575-002 | 5.10 ppb |
| 2023-04-10 | B2301575-003 | ND |
| 2023-05-09 | B2301963-001 | 6.20 ppb |
| 2023-05-09 | B2301963-002 | ND |