Green Bay Waterworks, WI
Exceeded the action level in the past
Latest 90th-percentile lead: 2.5 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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Who runs the water here
Green Bay Waterworks serves about 107,369 people through 39,766 service connections, which makes it a very large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Brown County, Wisconsin. EPA system ID: WI4050356. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2021 (3.3 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Green Bay Waterworks is 18 ppb across 12 monitoring periods, 3 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 2.5 ppb |
| 2021 | 3.3 ppb |
| 2020 | 2.6 ppb |
| 2020 | 9.3 ppb |
| 2019 | 18 ppb over 15 |
| 2019 | 11 ppb over 10 |
| 2018 | 11 ppb over 10 |
| 2018 | 12 ppb over 10 |
| 2017 | 16 ppb over 15 |
| 2017 | 12 ppb over 10 |
| 2016 | 18 ppb over 15 |
| 2016 | 15 ppb over 10 |
How Green Bay Waterworks compares
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. Green Bay Waterworks's 2.5 ppb sits at the 70th percentile in Wisconsin and the 78th nationally (higher means more lead).
Other water systems in Brown County
21 other systems share Brown County; 3 of them have a higher latest lead result than Green Bay Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| De Pere Waterworks Sa 1 | 25,660 | 0.66 ppb |
| Howard Waterworks | 21,133 | 1.2 ppb |
| Ashwaubenon Waterworks | 17,730 | 3.4 ppb |
| Bellevue Waterworks | 16,715 | 2.7 ppb |
| Allouez Waterworks | 13,923 | 5.9 ppb |
| Ledgeview Tn Sanitary Dist 2 | 7,602 | 2.1 ppb |
| Lawrence Waterworks | 5,398 | 0 (not detected) |
| Suamico Waterworks | 4,697 | 1.1 ppb |
| Pulaski Waterworks | 4,040 | 0.81 ppb |
| Wrightstown Waterworks | 3,815 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Green Bay, 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 Green Bay 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. Why an old exceedance still matters: over the limit before, under it now.