Three Lakes Sanitary District, WI
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 11.2 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.
About Three Lakes Sanitary District
Three Lakes Sanitary District serves about 500 people through 283 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Oneida County, Wisconsin. EPA system ID: WI7440129. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
That is up 8.75 ppb from 2.45 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Three Lakes Sanitary District is 11.2 ppb across 3 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 11.2 ppb over 10 |
| 2020 | 2.45 ppb |
| 2017 | 3.7 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. Three Lakes Sanitary District's 11.2 ppb sits at the 98th percentile in Wisconsin and the 98th nationally (higher means more lead).
Neighbouring systems
7 other systems share Oneida County; 0 of them have a higher latest lead result than Three Lakes Sanitary District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Rhinelander Water & Wastewater | 8,234 | 1 ppb |
| Lakeland Sanitary Dist 1 | 2,381 | 2.2 ppb |
| Northernaire Sanitary District | 315 | 2.5 ppb |
| Mcnaughton Correctional Center | 133 | 0 (not detected) |
| Patricia Lake Manufactured Housing Community | 56 | 1.18 ppb |
| Fishermans Paradise Mhp | 54 | 3.09 ppb |
| Rockwood Estates | 48 | 1.14 ppb |
Next steps for Three Lakes, WI
Test your own tap with a certified lab first-draw sample; Three Lakes, 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 Three Lakes Sanitary District 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. This system is in the band the 2027 10 ppb rule changes.