Marshfield Utilities, WI
Exceeded the action level in the past
Latest 90th-percentile lead: 8.2 ppb (monitoring period 2025-2025). 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.
About Marshfield Utilities
Marshfield Utilities serves about 18,815 people through 7,999 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 Wood County, Wisconsin. EPA system ID: WI7720165. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2025 (8.4 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Marshfield Utilities is 27 ppb across 5 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 8.2 ppb |
| 2025 | 8.4 ppb |
| 2020 | 27 ppb over 15 |
| 2019 | 4.8 ppb |
| 2016 | 5.4 ppb |
Where this result ranks
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. Marshfield Utilities's 8.2 ppb sits at the 96th percentile in Wisconsin and the 96th nationally (higher means more lead).
Nearby utilities
12 other systems share Wood County; 1 of them has a higher latest lead result than Marshfield Utilities. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Wis Rapids Water Works & Lighting Comm | 20,000 | 8.3 ppb |
| Nekoosa Waterworks | 2,394 | 0 (not detected) |
| Port Edwards Water Utility | 1,866 | 2.6 ppb |
| Biron Water Utility | 879 | 0.65 ppb |
| Pittsville Waterworks | 800 | 2.06 ppb |
| Vesper Waterworks | 512 | 1.1 ppb |
| Milladore Waterworks | 280 | 0.49 ppb |
| Pirco Mhp | 97 | 3.77 ppb |
| Hickory Shade | 55 | 0.45 ppb |
| Prairie Meadow Estates 1 | 50 | 1.08 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Marshfield, 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 Marshfield Utilities 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. Why an old exceedance still matters: over the limit before, under it now.