Manganese
Harris County Municipal Utility District 23
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 | 8.64 ppb | 17 | 14 | ND - 51.5 ppb |
| 2019 | 7.14 ppb | 121 | 103 | ND - 54.6 ppb |
| 2020 | 3.30 ppb | 2 | 2 | 1.60 ppb - 5.00 ppb |
| 2021 | 5.23 ppb | 146 | 39 | ND - 69.0 ppb |
| 2022 | 7.80 ppb | 279 | 85 | ND - 272.0 ppb |
| 2023 | 3.15 ppb | 2 | 2 | 1.60 ppb - 4.70 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 |
|---|---|---|
| 2020-03-11 | AF02204 | 1.60 ppb |
| 2020-03-11 | AF02205 | 5.00 ppb |
| 2023-01-17 | AG24614 | 4.70 ppb |
| 2023-04-06 | AG35745 | 1.60 ppb |