Chromium (total)
Gurdon Waterworks
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 | 5 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | 2.82 ppb | 6 | 4 | ND - 6.20 ppb |
| 2023 | 4.47 ppb | 3 | 3 | 3.00 ppb - 5.90 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 |
|---|---|---|
| 2018-04-24 | Y181150010 | ND |
| 2018-04-24 | Y181150011 | ND |
| 2019-01-23 | Y190240003 | ND |
| 2019-04-30 | Y191220035 | ND |
| 2019-04-30 | Y191220044 | ND |
| 2019-09-24 | Y192690006 | ND |
| 2019-12-10 | Y193460028 | ND |
| 2020-05-12 | Y201350026 | ND |
| 2020-05-12 | Y201350027 | ND |
| 2021-04-05 | Y210980009 | ND |
| 2021-04-05 | Y210980008 | ND |
| 2021-05-10 | Y211330026 | ND |
| 2022-02-07 | Y220410001 | ND |
| 2022-05-04 | Y221250018 | 3.40 ppb |
| 2022-05-04 | Y221250022 | 1.90 ppb |
| 2022-06-13 | Y221670033 | 6.20 ppb |
| 2022-07-11 | Y221950063 | 5.40 ppb |
| 2022-10-03 | Y222790057 | ND |
| 2023-02-13 | Y230470045 | 5.90 ppb |
| 2023-05-08 | Y231310023 | 3.00 ppb |
| 2023-05-08 | Y231310035 | 4.50 ppb |