Manganese
King County Water District #20
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.
4
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 2.53 ppb | 4 | 4 | 1.49 ppb - 4.57 ppb |
| 2019 | 1.28 ppb | 5 | 4 | ND - 2.70 ppb |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 0.500 ppb | 1 | 1 | 0.500 ppb |
| 2023 | 0.600 ppb | 1 | 1 | 0.600 ppb |
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 |
|---|---|---|
| 2018-01-08 | 1036223-20018R | 4.57 ppb |
| 2018-04-02 | 1047899 | 2.16 ppb |
| 2018-07-09 | 1066312 | 1.49 ppb |
| 2018-10-10 | 1086616 | 1.90 ppb |