Manganese in Idaho well water
In Idaho, manganese was detected in 44% of 7,608 tested private well samples.
Manganese stains fixtures and laundry above 50 ug/L. EPA's health advisory is 300 ug/L; infants are the most sensitive, and newer research links elevated manganese to neurological effects in children. It is one of the most common private well problems in New England.
Check your manganese number
Type the value from your lab report. It is compared to the EPA limit, the same way the full interpretation does it.
Getting it fixed
Book a free in-home water test with a licensed local company, or see the treatment guide for what removes manganese.
By county, from individual samples
Public monitoring samples against the EPA limit; counties with at least 30 samples.
| County | Samples | Detected | Above EPA limit | Median | Highest |
|---|---|---|---|---|---|
| Camas | 58 | 91% | no limit | 269 | 800 ug/L |
| Owyhee | 166 | 83% | no limit | 72 | 6,090 ug/L |
| Valley | 120 | 82% | no limit | 39 | 1,000 ug/L |
| Franklin | 58 | 81% | no limit | 51.7 | 256 ug/L |
| Washington | 126 | 78% | no limit | 206 | 935 ug/L |
| Benewah | 180 | 77% | no limit | 7.05 | 1,410 ug/L |
| Shoshone | 44 | 75% | no limit | 3.3 | 150 ug/L |
| Latah | 229 | 71% | no limit | 15 | 1,500 ug/L |
| Boundary | 114 | 69% | no limit | 2.1 | 220 ug/L |
| Boise | 97 | 67% | no limit | 2.1 | 365 ug/L |
| Bonner | 349 | 66% | no limit | 3.9 | 4,200 ug/L |
| Kootenai | 186 | 63% | no limit | 1.6 | 620 ug/L |
| Bear Lake | 91 | 62% | no limit | 3.3 | 1,700 ug/L |
| Idaho | 167 | 58% | no limit | 1.3 | 150 ug/L |
| Payette | 211 | 56% | no limit | 1.1 | 3,300 ug/L |
- Moscow CCD, Latah County95% detected of 44
- Murphy CCD, Owyhee County95% detected of 38
- Harrison CCD, Kootenai County94% detected of 50
- Deary-Bovill CCD, Latah County91% detected of 35
- Cascade CCD, Valley County91% detected of 53
- Huston CCD, Canyon County90% detected of 62
- Bonners Ferry CCD, Boundary County89% detected of 45
- East Camas CCD, Camas County88% detected of 42
- Grand View CCD, Owyhee County88% detected of 50
- Mink Creek CCD, Franklin County88% detected of 32
- Idaho City CCD, Boise County86% detected of 35
- Glenns Ferry CCD, Elmore County85% detected of 61
- Priest River CCD, Bonner County84% detected of 75
- Tensed CCD, Benewah County83% detected of 41
- Weiser CCD, Washington County79% detected of 110
- St. Maries CCD, Benewah County78% detected of 102
- Payette CCD, Payette County75% detected of 73
- McCall CCD, Valley County75% detected of 67
- Bruneau CCD, Owyhee County74% detected of 34
- Heyburn CCD, Minidoka County71% detected of 51
Sources
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. manganese counts and shares are listed on each county and town page with their sources.