Chromium (total)
Kent Water Department
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 | 5 | 0 | ND |
| 2019 | ND | 10 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 0.317 ppb | 9 | 5 | ND - 0.630 ppb |
| 2022 | ND | 3 | 0 | ND |
| 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 |
|---|---|---|
| 2018-07-16 | ND | |
| 2018-07-16 | ND | |
| 2018-07-17 | ND | |
| 2018-08-07 | ND | |
| 2018-08-07 | ND | |
| 2019-07-02 | ND | |
| 2019-07-02 | ND | |
| 2019-07-02 | ND | |
| 2019-07-12 | ND | |
| 2019-07-12 | ND | |
| 2019-07-16 | ND | |
| 2019-07-16 | ND | |
| 2019-07-22 | ND | |
| 2019-07-22 | ND | |
| 2019-07-23 | ND | |
| 2021-06-23 | 4180800 | 0.600 ppb |
| 2021-06-23 | 4180800 | 0.600 ppb |
| 2021-07-13 | 4212889 | 0.630 ppb |
| 2021-07-13 | 4212890 | ND |
| 2021-07-13 | 4212890 | ND |
| 2021-07-13 | 4212888 | ND |
| 2021-07-20 | 4200153 | 0.510 ppb |
| 2021-07-20 | 4200153 | 0.510 ppb |
| 2021-07-27 | 4203566 | ND |
| 2022-07-26 | 4329412 | ND |
| 2022-07-26 | 4329409 | ND |
| 2022-07-26 | 4329405 | ND |
| 2023-07-31 | 4511171 | ND |
| 2023-07-31 | 4511172 | ND |
| 2023-07-31 | 4511170 | ND |
| 2023-07-31 | 4511173 | ND |