Cashton Waterworks, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 4.5 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.
About Cashton Waterworks
Cashton Waterworks serves about 1,120 people through 528 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Monroe County, Wisconsin. EPA system ID: WI6420294. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2020 (3.5 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Cashton Waterworks is 4.5 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 4.5 ppb |
| 2020 | 3.5 ppb |
| 2017 | 4.2 ppb |
Against other Wisconsin systems
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. Cashton Waterworks's 4.5 ppb sits at the 86th percentile in Wisconsin and the 89th nationally (higher means more lead).
Other water systems in Monroe County
10 other systems share Monroe County; 0 of them have a higher latest lead result than Cashton Waterworks. 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) |
| 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) |
| Fort Mccoy South Post | 250 | 2.7 ppb |
| Cortland Acres | 145 | 2.29 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Cashton, 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 Cashton Waterworks 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Size matters more than most people expect: small vs large water systems.