Chromium (total)
North Central Texas Municipal Water Authority
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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | 0.900 ppb | 4 | 1 | ND - 3.60 ppb |
| 2022 | 0.933 ppb | 3 | 1 | ND - 2.80 ppb |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2018-02-13 | Q1806366003 | ND |
| 2018-05-15 | AE28106 | ND |
| 2018-05-15 | AE28110 | ND |
| 2018-05-15 | AE28112 | ND |
| 2019-03-07 | Q1909867006 | ND |
| 2019-05-14 | Q1925812001 | ND |
| 2019-05-14 | Q1925812002 | ND |
| 2019-05-14 | Q1925812003 | ND |
| 2020-03-17 | Q2011709013 | ND |
| 2020-03-17 | Q2011709005 | ND |
| 2020-03-17 | Q2011709004 | ND |
| 2020-03-17 | Q2011709003 | ND |
| 2021-03-01 | Q2105128006 | ND |
| 2021-03-01 | Q2105128007 | ND |
| 2021-05-18 | Q2112967012 | 3.60 ppb |
| 2021-08-24 | Q2122978007 | ND |
| 2022-03-02 | Q2207242004 | ND |
| 2022-03-02 | Q2207242005 | 2.80 ppb |
| 2022-09-07 | Q2226614011 | ND |
| 2023-03-08 | Q2309188004 | ND |
| 2023-05-16 | Q2318416008 | ND |
| 2023-09-05 | Q2338005002 | ND |