Chromium (total)
North Texas Municipal Water District Wylie 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 | 3 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-01-23 | Q1802554001 | ND |
| 2018-09-17 | Q1836833003 | ND |
| 2018-09-17 | Q1836833004 | ND |
| 2019-01-15 | Q1902044006 | ND |
| 2019-01-15 | Q1902044007 | ND |
| 2020-03-10 | Q2009279004 | ND |
| 2020-03-10 | Q2009279005 | ND |
| 2021-01-28 | Q2102310006 | ND |
| 2021-01-28 | Q2102310007 | ND |
| 2021-09-23 | Q2126118002 | ND |
| 2022-03-22 | Q2209138005 | ND |
| 2022-03-22 | Q2209138009 | ND |
| 2023-02-22 | Q2307413007 | ND |
| 2023-08-22 | Q2335430010 | ND |