Chromium (total)
Lockesburg Waterworks
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 | 3 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | 2.46 ppb | 5 | 4 | ND - 4.30 ppb |
| 2023 | 2.93 ppb | 3 | 3 | 2.20 ppb - 3.90 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 |
|---|---|---|
| 2018-01-31 | Y180330008 | ND |
| 2018-03-21 | Y180810021 | ND |
| 2018-05-21 | Y181440037 | ND |
| 2018-07-24 | Y182080024 | ND |
| 2018-10-22 | Y182980021 | ND |
| 2018-12-17 | Y183540003 | ND |
| 2019-02-04 | Y190380080 | ND |
| 2019-05-28 | Y191500001 | ND |
| 2019-05-28 | Y191500002 | ND |
| 2020-05-20 | Y201420040 | ND |
| 2020-09-08 | Y202540052 | ND |
| 2020-11-03 | Y203100058 | ND |
| 2021-01-27 | Y210280015 | ND |
| 2021-05-24 | Y211470039 | ND |
| 2021-07-20 | Y212030013 | ND |
| 2021-10-26 | Y213010024 | ND |
| 2022-01-11 | Y220130041 | ND |
| 2022-04-06 | Y220970003 | 4.30 ppb |
| 2022-04-06 | Y220970004 | 2.70 ppb |
| 2022-08-15 | Y222300059 | 4.30 ppb |
| 2022-10-19 | Y222930039 | 1.000 ppb |
| 2023-02-07 | Y230400074 | 3.90 ppb |
| 2023-02-07 | Y230400073 | 2.20 ppb |
| 2023-05-03 | Y231240066 | 2.70 ppb |