Watertown Waterworks, WI
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 15 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. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Who runs the water here
Watertown Waterworks serves about 23,945 people through 8,708 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 Jefferson County, Wisconsin. EPA system ID: WI1280044. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2022 (14 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Watertown Waterworks is 16 ppb across 7 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 15 ppb over 10 |
| 2022 | 14 ppb over 10 |
| 2022 | 13 ppb over 10 |
| 2021 | 16 ppb over 15 |
| 2021 | 14 ppb over 10 |
| 2020 | 16 ppb over 15 |
| 2017 | 14 ppb over 10 |
How Watertown 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. Watertown Waterworks's 15 ppb sits at the 99th percentile in Wisconsin and the 99th nationally (higher means more lead).
Neighbouring systems
18 other systems share Jefferson County; 0 of them have a higher latest lead result than Watertown Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Fort Atkinson Waterworks | 12,390 | 13 ppb |
| Jefferson Waterworks | 7,926 | 3.5 ppb |
| Lake Mills Waterworks | 6,211 | 4.6 ppb |
| Waterloo Waterworks | 3,520 | 1.3 ppb |
| Johnson Creek Waterworks | 3,318 | 2.8 ppb |
| Palmyra Waterworks | 1,756 | 3.8 ppb |
| Autumn Ridge Water System Llc | 575 | 0.59 ppb |
| Spacious Acres Mobile Home Community | 525 | 0.73 ppb |
| Tremain Mobile Home Park | 475 | 1.46 ppb |
| Lakewood Village | 160 | 2.58 ppb |
Next steps for Watertown, WI
Test your own tap with a certified lab first-draw sample; Watertown, 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 Watertown 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. See what changes at 10 ppb in 2027.