Delavan Waterworks, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 10 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.
Delavan Waterworks at a glance
Delavan Waterworks serves about 9,028 people through 3,343 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Walworth County, Wisconsin. EPA system ID: WI2650113. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2020 (9.8 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Delavan Waterworks is 10 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 10 ppb |
| 2020 | 9.8 ppb |
| 2017 | 8.4 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. Delavan Waterworks's 10 ppb sits at the 97th percentile in Wisconsin and the 97th nationally (higher means more lead).
Neighbouring systems
26 other systems share Walworth County; 2 of them have a higher latest lead result than Delavan Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Whitewater Waterworks | 14,000 | 10 ppb |
| Elkhorn Waterworks | 10,317 | 13 ppb |
| Lake Geneva Utility Commission | 7,107 | 8 ppb |
| East Troy Waterworks | 5,054 | 4.4 ppb |
| Bloomfield, Village Of | 4,071 | 1.95 ppb |
| Lake Como Sanitary Dist 1 | 3,038 | 2.5 ppb |
| Genoa City Waterworks | 2,766 | 4.56 ppb |
| Williams Bay Waterworks | 2,601 | 45 ppb |
| Walworth Waterworks | 2,304 | 6.3 ppb |
| Geneva National Community Services | 2,250 | 0.71 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Delavan, 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 Delavan 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. The lead result guide covers how utilities pick the homes they sample. Systems that went over once often dip back under; here is what that means.