Seymour Waterworks, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 1.7 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 Seymour Waterworks
Seymour Waterworks serves about 3,601 people through 1,366 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Outagamie County, Wisconsin. EPA system ID: WI4450337. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2024 (1.7 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Seymour Waterworks is 6.2 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.7 ppb |
| 2024 | 1.7 ppb |
| 2020 | 2.3 ppb |
| 2019 | 2.4 ppb |
| 2018 | 6.2 ppb |
| 2017 | 3.3 ppb |
| 2016 | 3 ppb |
Where this result ranks
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. Seymour Waterworks's 1.7 ppb sits at the 56th percentile in Wisconsin and the 66th nationally (higher means more lead).
Other water systems in Outagamie County
18 other systems share Outagamie County; 10 of them have a higher latest lead result than Seymour Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Appleton Waterworks | 74,511 | 1.3 ppb |
| Grand Chute Tn San Dist 1 | 21,583 | 3.1 ppb |
| Kaukauna Utilities | 17,493 | 2.4 ppb |
| Darboy Sanitary Dist 1 | 13,024 | 0.47 ppb |
| Little Chute Waterworks | 12,168 | 8.6 ppb |
| Greenville Utilities Vil Of | 11,340 | 7.5 ppb |
| Kimberly Waterworks | 7,608 | 13 ppb |
| Combined Locks Waterworks | 3,609 | 0 (not detected) |
| Freedom Sanitary District | 3,260 | 1.5 ppb |
| Hortonville Water Utility | 3,028 | 2.7 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Seymour, 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 Seymour 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. Size matters more than most people expect: small vs large water systems.