Manganese
Town of Ridgecrest Water Supply
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.
8
Samples
0
Samples exceeding legal limit (MCL)
6
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | 747.5 ppb | 8 | 8 | 470.0 ppb - 1,200.0 ppb |
| 2020 | 940.0 ppb | 3 | 3 | 170.0 ppb - 1,670.0 ppb |
| 2021 | 224.0 ppb | 5 | 5 | 60.0 ppb - 490.0 ppb |
| 2022 | 581.7 ppb | 6 | 6 | 10.00 ppb - 1,120.0 ppb |
| 2023 | 42.5 ppb | 4 | 3 | ND - 120.0 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 |
|---|---|---|
| 2020-04-14 | B2001768-001 | 1,670.0 ppb |
| 2020-04-14 | B2001768-002 | 980.0 ppb |
| 2020-11-18 | 35593321001 | 170.0 ppb |
| 2021-03-11 | B2101158-001 | 210.0 ppb |
| 2021-05-13 | B2102311-001 | 270.0 ppb |
| 2021-08-03 | B2103814-001 | 490.0 ppb |
| 2021-08-26 | B2104397-001 | 90.0 ppb |
| 2021-11-15 | B2106117-001 | 60.0 ppb |