Chromium (total)
Appleby Water Supply Corporation
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 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | 0.850 ppb | 4 | 1 | ND - 3.40 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 |
|---|---|---|
| 2018-04-18 | Q1815998029 | ND |
| 2019-01-24 | Q1903594014 | ND |
| 2020-05-06 | Q2017875013 | ND |
| 2020-05-06 | Q2017875014 | ND |
| 2020-05-06 | Q2017875015 | ND |
| 2020-05-06 | Q2017875028 | ND |
| 2021-02-01 | Q2102897021 | ND |
| 2021-07-26 | Q2119473009 | ND |
| 2022-09-06 | Q2226362013 | ND |
| 2022-09-06 | Q2226362026 | ND |
| 2023-03-22 | Q2310842005 | 3.40 ppb |
| 2023-08-14 | Q2333697003 | ND |
| 2023-08-14 | Q2333697004 | ND |
| 2023-10-23 | Q2345174004 | ND |