Chromium (total)
Yadkinville, Town of
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 | 1 | 0 | ND |
| 2020 | ND | 4 | 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 |
|---|---|---|
| 2018-08-30 | 92397772001IN | ND |
| 2018-10-02 | 92401702003IN | ND |
| 2019-10-10 | 92449188001_37712 | ND |
| 2020-11-17 | 92506633001A_37712 | ND |
| 2020-11-17 | 92506633001_37712 | ND |
| 2020-11-17 | 92506633002A_37712 | ND |
| 2020-11-17 | 92506633002_37712 | ND |
| 2021-11-10 | 92572134001_37712 | ND |
| 2021-11-10 | 92572134002_37712 | ND |
| 2022-08-11 | 92620221001_12710 | ND |
| 2022-09-07 | 92624365001_12710 | ND |
| 2023-01-02 | 92644697001_12710 | ND |
| 2023-01-05 | 92645447001_37712 | ND |