Oshkosh Waterworks, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 6.1 ppb (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
About Oshkosh Waterworks
Oshkosh Waterworks serves about 63,000 people through 22,487 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Winnebago County, Wisconsin. EPA system ID: WI4710457. Ask the utility on your bill for your address in their service line inventory.
Oshkosh Waterworks's lead record
That is down 1.4 ppb from 7.5 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Oshkosh Waterworks is 12 ppb across 4 monitoring periods, none of them over 15 ppb (2 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 6.1 ppb |
| 2024 | 7.5 ppb |
| 2020 | 11 ppb over 10 |
| 2017 | 12 ppb over 10 |
How Oshkosh Waterworks compares
Of the 947 Wisconsin systems with a lead result, the median latest reading is 1.33 ppb; 6 are over 15 ppb right now and 71 have gone over at some point. Oshkosh Waterworks's 6.1 ppb sits at the 91st percentile in Wisconsin and the 94th nationally (higher means more lead).
Neighbouring systems
10 other systems share Winnebago County; 1 of them has a higher latest lead result than Oshkosh Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Neenah Waterworks | 27,506 | 10 ppb |
| Menasha Elec & Water Util | 15,144 | 1.1 ppb |
| Fox Crossing Utilities West | 14,000 | 1.8 ppb |
| Fox Crossing Utilities East | 10,927 | 5.1 ppb |
| Algoma Tn Sanitary Dist 1 | 3,935 | 0.28 ppb |
| Omro Waterworks | 3,629 | 1.8 ppb |
| Winneconne Waterworks | 2,502 | 0.93 ppb |
| Winnebago Area Sanitary District | 90 | 5.6 ppb |
| Rolling Meadows Of Larsen Llc | 85 | 2.95 ppb |
| Willow Pines Mfd Home Community | 70 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Oshkosh, WI may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Oshkosh Waterworks whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. Why sampled homes are the worst-case ones is in the guide to reading the number. Systems that went over once often dip back under; here is what that means.