Manganese
King County Water District No 90
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.
7
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 | 3.43 ppb | 4 | 4 | 1.60 ppb - 6.50 ppb |
| 2019 | ND | 1 | 0 | ND |
| 2020 | 3.12 ppb | 6 | 6 | 1.50 ppb - 5.30 ppb |
| 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 |
|---|---|---|
| 2019-06-26 | ND | |
| 2020-02-10 | C0B1154-01 | 2.70 ppb |
| 2020-02-10 | C0B1154-02 | 3.10 ppb |
| 2020-05-05 | C0E0686-01 | 2.70 ppb |
| 2020-08-04 | C0H0486-02 | 5.30 ppb |
| 2020-08-04 | C0H0486-01 | 1.50 ppb |
| 2020-11-04 | C0K0811-01 | 3.40 ppb |