Mosinee East System, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 0.41 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. 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.
Mosinee East System at a glance
Mosinee East System serves about 1,046 people through 387 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 Marathon County, Wisconsin. EPA system ID: WI7372480. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2021 (0.65 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Mosinee East System is 2 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0.41 ppb |
| 2021 | 0.65 ppb |
| 2020 | 0.45 ppb |
| 2019 | 2 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. Mosinee East System's 0.41 ppb sits at the 25th percentile in Wisconsin and the 42nd nationally (higher means more lead).
Nearby utilities
22 other systems share Marathon County; 19 of them have a higher latest lead result than Mosinee East System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Wausau Waterworks | 39,994 | 5.8 ppb |
| 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 |
Your move
Test your own tap with a certified lab first-draw sample; Mosinee, 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 Mosinee East System 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. Systems that went over once often dip back under; here is what that means.