Hazel Green Waterworks, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 2.83 ppb (monitoring period 2024-2024). 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.
Hazel Green Waterworks at a glance
Hazel Green Waterworks serves about 1,193 people through 525 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 Grant County, Wisconsin. EPA system ID: WI1220102. Ask the utility on your bill for your address in their service line inventory.
Hazel Green Waterworks's lead record
Against the period ending 2024 (3.09 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Hazel Green Waterworks is 7.86 ppb across 9 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 2.83 ppb |
| 2024 | 3.09 ppb |
| 2023 | 4.54 ppb |
| 2023 | 3 ppb |
| 2020 | 7.86 ppb |
| 2019 | 7.78 ppb |
| 2018 | 2.04 ppb |
| 2017 | 2.75 ppb |
| 2016 | 2.21 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. Hazel Green Waterworks's 2.83 ppb sits at the 74th percentile in Wisconsin and the 80th nationally (higher means more lead).
Nearby utilities
27 other systems share Grant County; 4 of them have a higher latest lead result than Hazel Green Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Platteville Waterworks | 12,268 | 10.3 ppb |
| Lancaster Waterworks | 3,907 | 1.8 ppb |
| Boscobel Waterworks | 3,237 | 1.1 ppb |
| Fennimore Waterworks | 2,507 | 1.61 ppb |
| Cuba City Waterworks | 2,141 | 0 (not detected) |
| Muscoda Waterworks | 1,453 | 2.64 ppb |
| Dickeyville Waterworks | 1,069 | 0 (not detected) |
| Cassville Waterworks | 777 | 3.24 ppb |
| Montfort Waterworks | 718 | 1.1 ppb |
| Potosi Waterworks | 718 | 1.72 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Hazel Green, 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 Hazel Green 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Systems that went over once often dip back under; here is what that means.