Fort Mccoy South Post, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 2.7 ppb (monitoring period 2021-2021). 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.
Who runs the water here
Fort Mccoy South Post serves about 250 people through 119 service connections, which makes it a very small system under EPA's size classes. It is federally owned and draws groundwater, in Monroe County, Wisconsin. EPA system ID: WI6420307. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2018 (2.65 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Fort Mccoy South Post is 2.7 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2021 | 2.7 ppb |
| 2018 | 2.65 ppb |
How Fort Mccoy South Post 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. Fort Mccoy South Post's 2.7 ppb sits at the 71st percentile in Wisconsin and the 79th nationally (higher means more lead).
Neighbouring systems
10 other systems share Monroe County; 1 of them has a higher latest lead result than Fort Mccoy South Post. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Sparta Waterworks | 10,025 | 1.4 ppb |
| Fort Mccoy North Post | 10,000 | 1.7 ppb |
| Tomah Waterworks | 9,192 | 0 (not detected) |
| Cashton Waterworks | 1,120 | 4.5 ppb |
| Norwalk Waterworks | 653 | 0 (not detected) |
| Warrens Waterworks | 540 | 0 (not detected) |
| Wilton Waterworks | 490 | 0 (not detected) |
| Kendall Waterworks | 458 | 2.36 ppb |
| Oakdale Waterworks | 317 | 0 (not detected) |
| Cortland Acres | 145 | 2.29 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Fort Mccoy, 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 Fort Mccoy South Post 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. The action level is dropping - the 10 ppb rule from 2027.