Manganese
Norwalk First Taxing District
Manganese is a naturally occurring element that is common in food and drinking water. Excessive manganese exposures may impair children's attention, memory and intellectual capacity. Click here to read more about manganese.
6
Samples
0
Samples exceeding legal limit (MCL)
2
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 156.4 ppb | 3 | 3 | 1.90 ppb - 459.0 ppb |
| 2019 | 54.7 ppb | 3 | 3 | 0.580 ppb - 152.0 ppb |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 100 ppb
The EWG Health Guideline of 100 ppb for manganese was defined by the state of Minnesota as a health risk limit, the concentration of a contaminant that can be consumed with little or no risk to health. This health guideline protects against harm to the brain and nervous system.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-07-11 | 2326663002 | 459.0 ppb |
| 2018-07-12 | 2326663001 | 8.30 ppb |
| 2018-10-10 | 2344704001 | 1.90 ppb |
| 2019-01-09 | 3010835002 | 152.0 ppb |
| 2019-01-10 | 3010835001 | 11.4 ppb |
| 2019-04-11 | 3028113001 | 0.580 ppb |