Wiota Sanitary District, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 0.51 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.
Who runs the water here
Wiota Sanitary District serves about 98 people through 36 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 Lafayette County, Wisconsin. EPA system ID: WI1330078. Ask the utility on your bill for your address in their service line inventory.
Wiota Sanitary District's lead record
Against the period ending 2020 (0.53 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Wiota Sanitary District is 1.9 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0.51 ppb |
| 2020 | 0.53 ppb |
| 2017 | 1.9 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. Wiota Sanitary District's 0.51 ppb sits at the 27th percentile in Wisconsin and the 43rd nationally (higher means more lead).
Neighbouring systems
8 other systems share Lafayette County; 6 of them have a higher latest lead result than Wiota Sanitary District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Darlington Waterworks | 2,235 | 0.99 ppb |
| Shullsburg Waterworks | 1,222 | 6.12 ppb |
| Belmont Waterworks | 989 | 3.95 ppb |
| Benton Waterworks | 976 | 0.98 ppb |
| Argyle Waterworks | 823 | 6.67 ppb |
| Blanchardville Waterworks | 810 | 0 (not detected) |
| South Wayne Waterworks | 478 | 0 (not detected) |
| Gratiot Waterworks | 224 | 1.38 ppb |
Your move
Test your own tap with a certified lab first-draw sample; South Wayne, 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 Wiota 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. What a 90th-percentile result does and does not tell you: how to read a lead result. The action level is dropping - the 10 ppb rule from 2027.