Stoughton Waterworks, WI
Exceeded the action level in the past
Latest 90th-percentile lead: 4.2 ppb (monitoring period 2023-2023). 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
Stoughton Waterworks serves about 13,078 people through 4,843 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 groundwater, in Dane County, Wisconsin. EPA system ID: WI1130078. Ask the utility on your bill for your address in their service line inventory.
Stoughton Waterworks's lead record
That is up 1.4 ppb from 2.8 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Stoughton Waterworks is 18 ppb across 6 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 4.2 ppb |
| 2022 | 2.8 ppb |
| 2019 | 18 ppb over 15 |
| 2018 | 11 ppb over 10 |
| 2017 | 15 ppb over 10 |
| 2016 | 12 ppb over 10 |
How Stoughton 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. Stoughton Waterworks's 4.2 ppb sits at the 85th percentile in Wisconsin and the 89th nationally (higher means more lead).
Other water systems in Dane County
42 other systems share Dane County; 9 of them have a higher latest lead result than Stoughton Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Madison Water Utility | 272,000 | 1.8 ppb |
| Sun Prairie Utilities | 39,300 | 2.8 ppb |
| Fitchburg Utility Dist 1 | 29,900 | 2.3 ppb |
| Middleton Waterworks | 23,868 | 4 ppb |
| Waunakee Waterworks | 14,879 | 1.7 ppb |
| Verona Waterworks | 14,030 | 2.86 ppb |
| Oregon Waterworks | 11,200 | 4.97 ppb |
| Deforest Waterworks | 10,500 | 5.95 ppb |
| Mcfarland Waterworks | 9,676 | 2.1 ppb |
| Cottage Grove Waterworks | 9,345 | 2.33 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Stoughton, 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 Stoughton 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. What a 90th-percentile result does and does not tell you: how to read a lead result. More in what a past exceedance means today.