Oshkosh
Oshkosh, WI water profile — supply sources, drought status, wastewater reuse, and the key water issues facing the city.
oshkosh waterworks
surface water (rivers/reservoirs) · local government · PWSID WI4710457
Below EPA's 15 ppb lead action level at last testing.
Source: EPA Safe Drinking Water Information System (SDWIS) · 2026 Q1
Oshkosh is a small but growing city and the 9th-largest in Wisconsin, home to roughly 66,555 residents. Oshkosh's drinking water comes largely from the same regional sources that serve Wisconsin: Great Lakes, Wisconsin River, and aquifers.
As elsewhere in Wisconsin, the central challenge is aging infrastructure. Great Lakes access is abundant, but PFAS and nitrate contamination affect many private and municipal wells.
Wisconsin reuses an estimated 3% of its treated wastewater and maintains minimal reuse programs; Oshkosh tracks abnormally dry to moderate drought conditions on the U.S. Drought Monitor scale.
Explore the Wisconsin profile for statewide context, or dig into the water issues shaping Oshkosh below.
Winnebago County water quality
Source: EPA SDWIS · 2026 Q1
At a glance
- Population ~66,555 (9th-largest in Wisconsin)
- Primary sources: Great Lakes, Wisconsin River, and aquifers
- Drought: abnormally dry to moderate conditions
- State reuse rate: ~3% of wastewater
Statewide drought history
% of Wisconsin in severe+ drought (Moderate (D1) now).
Source: U.S. Drought Monitor
Common questions
Is tap water safe in Oshkosh?
Oshkosh's largest water system, OSHKOSH WATERWORKS, serves about 63,000 people. EPA records show 0 health-based violation(s) since 2016 and a most-recent 90th-percentile lead level of 6.1 ppb (EPA action level is 15 ppb). Always check your own provider's annual Consumer Confidence Report.
Where does Oshkosh get its water?
OSHKOSH WATERWORKS draws primarily from surface water (rivers/reservoirs), part of Wisconsin's supply from Great Lakes, Wisconsin River, aquifers.
Related water issues
Aging Infrastructure
Much of America's water infrastructure is decades past its design life, leaking trillions of gallons a year and demanding hundreds of billions in reinvestment.
ExplorePFAS Contamination
Per- and polyfluoroalkyl substances persist in water supplies for decades. New federal limits are forcing utilities nationwide to invest in advanced treatment.
Explore