Manitowoc Waterworks, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 7.7 ppb (monitoring period 2025-2025). 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.
Manitowoc Waterworks at a glance
Manitowoc Waterworks serves about 34,500 people through 14,641 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Manitowoc County, Wisconsin. EPA system ID: WI4360364. Ask the utility on your bill for your address in their service line inventory.
Manitowoc Waterworks's lead record
Against the period ending 2023 (7.7 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Manitowoc Waterworks is 15 ppb across 6 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 7.7 ppb |
| 2023 | 7.7 ppb |
| 2023 | 5.3 ppb |
| 2019 | 8.5 ppb |
| 2018 | 9 ppb |
| 2017 | 15 ppb over 10 |
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. Manitowoc Waterworks's 7.7 ppb sits at the 95th percentile in Wisconsin and the 95th nationally (higher means more lead).
Other water systems in Manitowoc County
13 other systems share Manitowoc County; 1 of them has a higher latest lead result than Manitowoc Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Two Rivers Waterworks | 11,270 | 13 ppb |
| Kiel Waterworks | 3,932 | 0.77 ppb |
| Cleveland Waterworks | 1,524 | 6.3 ppb |
| Mishicot Waterworks | 1,432 | 1.9 ppb |
| Reedsville Waterworks | 1,200 | 2.6 ppb |
| Valders Waterworks | 954 | 6.8 ppb |
| Whitelaw Waterworks | 757 | 3.1 ppb |
| St Nazianz Waterworks | 705 | 1.4 ppb |
| Maribel Waterworks | 355 | 0.99 ppb |
| Kellnersville Waterworks | 301 | 3.5 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Manitowoc, 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 Manitowoc 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. The action level is dropping - the 10 ppb rule from 2027.