Wausau Waterworks, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 5.8 ppb (monitoring period 2020-2020). 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.
Wausau Waterworks at a glance
Wausau Waterworks serves about 39,994 people through 15,643 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 Marathon County, Wisconsin. EPA system ID: WI7370102. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2019 (5.69 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Wausau Waterworks is 13.2 ppb across 5 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2020 | 5.8 ppb |
| 2019 | 5.69 ppb |
| 2018 | 7.16 ppb |
| 2017 | 13.2 ppb over 10 |
| 2016 | 6.4 ppb |
How Wausau 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. Wausau Waterworks's 5.8 ppb sits at the 90th percentile in Wisconsin and the 93rd nationally (higher means more lead).
Nearby utilities
22 other systems share Marathon County; 2 of them have a higher latest lead result than Wausau Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Weston Municipal Utilities | 16,000 | 0.75 ppb |
| Kronenwetter Water & Sewer Utility | 6,931 | 0.76 ppb |
| Rib Mountain Water Utility | 6,398 | 2.4 ppb |
| Mosinee Waterworks | 3,406 | 2.2 ppb |
| Rothschild Waterworks | 3,190 | 7.3 ppb |
| Abbotsford Waterworks | 2,502 | 3.5 ppb |
| Schofield Waterworks | 2,205 | 0 (not detected) |
| Spencer Waterworks | 1,848 | 0.8 ppb |
| Colby Waterworks | 1,829 | 0.95 ppb |
| Marathon City Waterworks | 1,695 | 0.36 ppb |
Next steps for Wausau, WI
Test your own tap with a certified lab first-draw sample; Wausau, 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 Wausau 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. Systems that went over once often dip back under; here is what that means.