Chromium (total)
Westchester County Water District #3
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 | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | 0.250 ppb | 4 | 1 | ND - 1.000 ppb |
| 2022 | 1.75 ppb | 4 | 2 | ND - 4.00 ppb |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-10-02 | AU21376INP | ND |
| 2019-11-21 | AV24564INP | ND |
| 2020-04-28 | AW07856INP | ND |
| 2020-11-17 | AW22089INP | ND |
| 2020-12-15 | AW23893-INP | ND |
| 2020-12-15 | AW23891-INP | ND |
| 2021-04-06 | AX06359-INP | ND |
| 2021-10-29 | AX21799-INP | 1.000 ppb |
| 2021-11-09 | AX22573-INP | ND |
| 2021-11-09 | AX22576-INP | ND |
| 2022-04-11 | AY05984-INP | ND |
| 2022-10-19 | AY18880-INP | ND |
| 2022-11-01 | AY19679-INP | 4.00 ppb |
| 2022-11-01 | AY19681-INP | 3.00 ppb |
| 2023-04-25 | AZ07359-INP | ND |
| 2023-10-19 | AZ19381-INP | ND |
| 2023-11-01 | AZ20238-INP | ND |
| 2023-11-01 | AZ20240-INP | ND |