Thorp Waterworks, WI
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 11 ppb (monitoring period 2026-2026). 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.
About Thorp Waterworks
Thorp Waterworks serves about 1,636 people through 774 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 Clark County, Wisconsin. EPA system ID: WI6100337. Ask the utility on your bill for your address in their service line inventory.
Thorp Waterworks's lead record
That is down 3 ppb from 14 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Thorp Waterworks is 38 ppb across 6 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 11 ppb over 10 |
| 2025 | 14 ppb over 10 |
| 2024 | 38 ppb over 15 |
| 2023 | 21 ppb over 15 |
| 2020 | 7.8 ppb |
| 2017 | 7 ppb |
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. Thorp Waterworks's 11 ppb sits at the 98th percentile in Wisconsin and the 98th nationally (higher means more lead).
Other water systems in Clark County
11 other systems share Clark County; 0 of them have a higher latest lead result than Thorp Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Neillsville Waterworks | 2,384 | 1.15 ppb |
| Loyal Waterworks | 1,308 | 0 (not detected) |
| Greenwood Waterworks | 1,079 | 0 (not detected) |
| Owen Waterworks | 936 | 1.8 ppb |
| Dorchester Waterworks | 834 | 0 (not detected) |
| Clark County Rehabilitation & Living Center | 510 | 1.78 ppb |
| Withee Waterworks | 506 | 2.3 ppb |
| Granton Waterworks | 349 | 2.25 ppb |
| Curtiss Waterworks | 346 | 0.64 ppb |
| Grandview Mobile Home Court | 42 | 3.7 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Thorp, 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 Thorp 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. See what changes at 10 ppb in 2027.