Duncan Prairie Mhc, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 1.19 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
Duncan Prairie Mhc serves about 64 people through 35 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Chippewa County, Wisconsin. EPA system ID: WI6090445. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2018 (0.85 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Duncan Prairie Mhc is 1.19 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2021 | 1.19 ppb |
| 2018 | 0.85 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. Duncan Prairie Mhc's 1.19 ppb sits at the 46th percentile in Wisconsin and the 58th nationally (higher means more lead).
Neighbouring systems
10 other systems share Chippewa County; 6 of them have a higher latest lead result than Duncan Prairie Mhc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Chippewa Falls Waterworks | 13,375 | 2.2 ppb |
| Lake Hallie Waterworks Village Of | 6,701 | 1.1 ppb |
| Bloomer Waterworks | 3,680 | 0 (not detected) |
| Stanley Waterworks | 3,500 | 2 ppb |
| Cornell Waterworks | 1,390 | 8.5 ppb |
| Cadott Waterworks | 1,352 | 1.2 ppb |
| New Auburn Waterworks | 549 | 0 (not detected) |
| Boyd Waterworks | 540 | 1.6 ppb |
| Hoffmanns Wissota Court | 126 | 0.3 ppb |
| Lafayette Court | 78 | 2.5 ppb |
Next steps for Westby, WI
Test your own tap with a certified lab first-draw sample; Westby, 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 Duncan Prairie Mhc 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. Size matters more than most people expect: small vs large water systems.