Genoa City Waterworks, WI
Exceeded the action level in the past
Latest 90th-percentile lead: 4.56 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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Who runs the water here
Genoa City Waterworks serves about 2,766 people through 1,024 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Walworth County, Wisconsin. EPA system ID: WI2650058. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2024 (4.29 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Genoa City Waterworks is 129 ppb across 13 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4.56 ppb |
| 2024 | 4.29 ppb |
| 2024 | 4.97 ppb |
| 2023 | 8.1 ppb |
| 2022 | 4.31 ppb |
| 2021 | 10.4 ppb over 10 |
| 2020 | 8.17 ppb |
| 2020 | 8.81 ppb |
| 2019 | 24.5 ppb over 15 |
| 2019 | 7.96 ppb |
| 2018 | 8.95 ppb |
| 2018 | 7.6 ppb |
| 2017 | 129 ppb over 15 |
Against other Wisconsin systems
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. Genoa City Waterworks's 4.56 ppb sits at the 86th percentile in Wisconsin and the 89th nationally (higher means more lead).
Other water systems in Walworth County
26 other systems share Walworth County; 7 of them have a higher latest lead result than Genoa City Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Whitewater Waterworks | 14,000 | 10 ppb |
| Elkhorn Waterworks | 10,317 | 13 ppb |
| Delavan Waterworks | 9,028 | 10 ppb |
| Lake Geneva Utility Commission | 7,107 | 8 ppb |
| East Troy Waterworks | 5,054 | 4.4 ppb |
| Bloomfield, Village Of | 4,071 | 1.95 ppb |
| Lake Como Sanitary Dist 1 | 3,038 | 2.5 ppb |
| Williams Bay Waterworks | 2,601 | 45 ppb |
| Walworth Waterworks | 2,304 | 6.3 ppb |
| Geneva National Community Services | 2,250 | 0.71 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Genoa City, 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 Genoa City 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. The lead result guide covers how utilities pick the homes they sample. Why an old exceedance still matters: over the limit before, under it now.