Chromium (total)
Adams County W/a #2-south
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 | 1.90 ppb | 5 | 5 | 0.500 ppb - 3.80 ppb |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | 0.310 ppb | 10 | 4 | ND - 1.10 ppb |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 1.30 ppb | 6 | 6 | 0.700 ppb - 2.00 ppb |
| 2023 | 1.85 ppb | 2 | 2 | 1.000 ppb - 2.70 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 |
|---|---|---|
| 2018-09-10 | 180911-024IN | 0.500 ppb |
| 2018-09-10 | 180911-025IN | 2.30 ppb |
| 2018-09-10 | 180911-026IN | 2.20 ppb |
| 2018-09-10 | 180911-027IN | 3.80 ppb |
| 2018-09-17 | 180918-002IN | 0.700 ppb |
| 2020-03-30 | 200331-033IN | 1.10 ppb |
| 2020-03-30 | 200331-036IN | ND |
| 2020-03-30 | 200331-035IN | 0.600 ppb |
| 2020-03-30 | 200331-034IN | 0.700 ppb |
| 2020-03-30 | 200331-032IN | 0.700 ppb |
| 2020-04-06 | IN-200407-024 | ND |
| 2020-04-06 | IN-200407-023 | ND |
| 2020-04-06 | IN-200407-022 | ND |
| 2020-04-06 | IN-200407-021 | ND |
| 2020-04-06 | IN-200407-020 | ND |
| 2022-05-03 | IN-220504-005 | 0.900 ppb |
| 2022-05-03 | IN-220504-006 | 0.800 ppb |
| 2022-05-03 | IN-220504-007 | 1.80 ppb |
| 2022-05-03 | IN-220504-008 | 2.00 ppb |
| 2022-05-03 | IN-220504-009 | 1.60 ppb |
| 2022-11-30 | IN-221201-025 | 0.700 ppb |
| 2023-02-21 | IN-230222-004 | 1.000 ppb |
| 2023-05-15 | IN-230516-023 | 2.70 ppb |