Water Quality in Oshkosh, WI (54923)
EPA violation data for public water systems serving ZIP code 54923.
Active Health Violations
2 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 77% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
8,793
Population
47
Water Systems
20
Violations (5yr)
2
Health-Based
Location
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Water Systems Serving This Area (47)
Oshkosh Waterworks
1 health-basedNeenah Waterworks
Fox Crossing Utilities West
1 health-basedBerlin Waterworks
All Saints Catholic Parish
Walkers Bar & Grill
Country Inn
Encore Steak House
Mascoutin Country Club Clubhouse
Jrs Parkside Grille
Mascoutin Country Club Ice Machine
All resolvedSt Pauls Ev Lutheran Ch
All resolvedSeneca Foods Berlin Migrant Camp 223
Poy Sippi Grade School
Zion Un Methodist Ch
Badger Mining Corp Taylor Office
Badger Mining - Kermit Plant
All resolvedValley Trail Recycling & Disposal
Kelley Ts
Kelley Ts
All resolvedMascoutin Country Club Clubhouse Well
Darling International
Badger Mining Corp-Merrillan West Coating Plant
Seneca Foods Berlin Facility
Badger Mining Fairwater Office
J & J Sports
Rural Heights Elementary
Migrant Labor Camp 657
Leach Farms Office & Shop
Drexel Building Supply
All resolvedBadger Mining Corp Dry Plant 2
Mimis On Route 49
Venetian Tavern
Mimis On Route 49
All resolvedWillow Inn Bar
Badger Mining Secondary Wash Plant 4
Olsen Feed Mill Flowing Well
Badger Mining Corp Mobile Equipment Shop
Hidden Harbor Marina
Peter Leach
Immanuel Lutheran Ch
Flowing Well Cth H 1 Mi West
Gatzke Farm 628
Badger Mining Truck Yard
Badger Mining Corp - Taylor Coating Plant
Badger Mining Corp-Merrillan East Coating Plant
Contaminants Found
Missed testing deadlines — not a detection of bacteria.
At high levels, nitrate can cause blue baby syndrome in infants.
Used to disinfect water — generally safe at regulated levels.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Sep 2025
How Does This Compare?
Oshkosh (54923) has more violations than 77% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 20.
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.