Manganese in Washington well water
In Washington, manganese was detected in 77% of 9,424 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.
Test your Washington well for manganese
Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.
Order the Tap Score well water test kit, from $209Already tested? Upload the report
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Systems that remove manganese
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Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.
For manganese
Iron and manganese oxidizing filter
whole-house, at the point of entry, about $1,800
Air-injection or greensand media; fixes staining at the source.
Rather have it installed and sized for your well? Book a free in-home water test with a licensed local company.
Where to get a well tested for manganese in Washington: certified labs, state programs and prices.
By county, from individual samples
Public monitoring samples against the EPA limit; counties with at least 30 samples.
| County | Above EPA limit | Samples | Detected | Median | Highest |
|---|---|---|---|---|---|
| Stevens | no limit | 1,757 | 97% | 250 | 1,430,000 ug/L |
| San Juan | no limit | 60 | 95% | 20 | 910 ug/L |
| Clark | no limit | 705 | 94% | 5 | 7,080 ug/L |
| Island | no limit | 105 | 92% | 83.3 | 7,100 ug/L |
| Whatcom | no limit | 282 | 90% | 16 | 18,100 ug/L |
| Skagit | no limit | 74 | 89% | 95.5 | 1,500 ug/L |
| Cowlitz | no limit | 80 | 89% | 110 | 4,600 ug/L |
| Snohomish | no limit | 334 | 88% | 29.5 | 910 ug/L |
| Kitsap | no limit | 625 | 88% | 110 | 6,300 ug/L |
| Thurston | no limit | 867 | 84% | 11 | 12,000 ug/L |
| King | no limit | 479 | 83% | 40 | 4,510 ug/L |
| Whitman | no limit | 227 | 80% | 0 | 1,100 ug/L |
| Mason | no limit | 53 | 79% | 20 | 900 ug/L |
| Kittitas | no limit | 92 | 77% | 0 | 170 ug/L |
| Walla Walla | no limit | 56 | 77% | 0 | 230 ug/L |
- Vancouver CCD, Clark County98% detected of 628
- Spokane Reservation CCD, Stevens County98% detected of 1,730
- Pullman CCD, Whitman County95% detected of 41
- Ferndale CCD, Whatcom County95% detected of 73
- Granite Falls CCD, Snohomish County94% detected of 33
- Longview-Kelso CCD, Cowlitz County93% detected of 30
- Seattle CCD, King County93% detected of 72
- Poulsbo CCD, Kitsap County93% detected of 496
- Lummi Reservation CCD, Whatcom County92% detected of 53
- Stanwood CCD, Snohomish County91% detected of 66
- North Whidbey Island CCD, Island County90% detected of 63
- Sumas CCD, Whatcom County90% detected of 78
- Olympia CCD, Thurston County89% detected of 535
- Garfield-Oakesdale CCD, Whitman County89% detected of 35
- Monroe CCD, Snohomish County88% detected of 34
- Seattle East CCD, King County88% detected of 74
- Maltby CCD, Snohomish County87% detected of 31
- Swinomish Reservation CCD, Skagit County87% detected of 31
- Richland-Kennewick CCD, Benton County87% detected of 31
- Lynden CCD, Whatcom County87% detected of 46
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.