Chromium (total)
Utrwd Regional Water Treatment Plant
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 | 0.650 ppb | 2 | 1 | ND - 1.30 ppb |
| 2020 | 0.850 ppb | 2 | 1 | ND - 1.70 ppb |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | 0.950 ppb | 2 | 1 | ND - 1.90 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 |
|---|---|---|
| 2018-02-13 | Q1805957002 | ND |
| 2018-09-25 | Q1838256002 | ND |
| 2019-03-07 | Q1909910003 | ND |
| 2019-10-02 | Q1971112002 | 1.30 ppb |
| 2020-03-09 | Q2008448002 | ND |
| 2020-08-18 | Q2032859007 | 1.70 ppb |
| 2021-02-23 | Q2104596002 | ND |
| 2021-09-27 | Q2126305007 | ND |
| 2022-01-25 | Q2202436002 | ND |
| 2022-09-15 | Q2227673009 | ND |
| 2023-03-07 | Q2308901003 | ND |
| 2023-08-02 | Q2331445007 | 1.90 ppb |