Chromium (total)
Southwood Water System
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 | 6 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 14 | 0 | ND |
| 2022 | ND | 10 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/A |
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 | ND | |
| 2018-02-02 | ND | |
| 2018-04-05 | ND | |
| 2018-05-04 | ND | |
| 2018-05-09 | ND | |
| 2018-07-19 | ND | |
| 2019-01-28 | ND | |
| 2019-01-28 | ND | |
| 2019-01-28 | ND | |
| 2019-01-28 | ND | |
| 2019-01-28 | ND | |
| 2019-02-08 | ND | |
| 2021-03-17 | 4096998 | ND |
| 2021-03-17 | 4093774 | ND |
| 2021-03-18 | 4464988 | ND |
| 2021-03-18 | 4465076 | ND |
| 2021-03-18 | 4465041 | ND |
| 2021-03-23 | 4096992 | ND |
| 2021-03-23 | 4098028 | ND |
| 2021-03-25 | 4093772 | ND |
| 2021-03-25 | 4093771 | ND |
| 2021-03-25 | 4093769 | ND |
| 2021-03-25 | 4093770 | ND |
| 2021-03-25 | 4093773 | ND |
| 2021-03-25 | 4093768 | ND |
| 2021-04-14 | 4465088 | ND |
| 2022-01-26 | 4263659 | ND |
| 2022-01-26 | 4263657 | ND |
| 2022-01-26 | 4263658 | ND |
| 2022-01-27 | 4253226 | ND |
| 2022-02-04 | 4268894 | ND |
| 2022-02-10 | 4268896 | ND |
| 2022-11-03 | 4375238 | ND |
| 2022-11-03 | 4375239 | ND |
| 2022-11-28 | 4395604 | ND |
| 2022-12-15 | 4411922 | ND |