Illinois · population 6,565
Lead pipes in Winthrop Harbor, IL
13 lead or galvanized lines to replace
Most of Winthrop Harbor (population 6,565) gets its water from Winthrop Harbor. That system reported 13 lead and 0 galvanized-requiring-replacement service lines out of 2,315, with 804 more of unknown material.
0.6% of Winthrop Harbor's service lines are lead or galvanized requiring replacement, lower than the Illinois average (17%) and lower than the national average (3.1%).
- Lead 0.6%
- Galvanized (replace) 0%
- Unknown 35%
- Non-lead 65%
Latest lead test for Winthrop Harbor (Jan 2026–Jun 2026): 5.3 ppb at the 90th percentile, against a 15 ppb federal action level. Full test history.
Compliance record: EPA lists 7 Lead and Copper Rule violations since 2015, 2 still open for Winthrop Harbor.
Water systems serving Winthrop Harbor
| Water system | Lead | Galv. | Unknown | % lead |
|---|---|---|---|---|
| Winthrop HarborMain system | 13 | 0 | 804 | 0.6% |
| ZionServes nearby areas | 25 | 16 | 0 | 0.6% |
Matched from EPA water system service area boundaries and the cities each system reports serving. Edges of the city may be served by a neighboring system; your water bill names your utility.
Check your address in Winthrop Harbor
The counts above cover the whole water system. To see whether your line is lead, look up your address on Winthrop Harbor's official inventory. Utilities had to make these public by October 16, 2024.
No map yet? Do the 2-minute scratch and magnet test.
Protect your drinking water
If your line is lead, galvanized or unknown, use a filter certified to NSF/ANSI 53 for lead for drinking, cooking and baby formula, and use only cold water.
Choosing a lead-certified filter · Testing your water · Replacement cost
Nearby cities
- Zion41 lead + galv. lines
- Beach Parkno lead reported
- Wadsworth7,322 lead + galv. lines
- Waukegan7,322 lead + galv. lines
- Parkno lead reported
- Gurneeno lead reported
- Lindenhurst439 unknown
- North Chicago849 lead + galv. lines
Check another water system
Questions
Does Winthrop Harbor, IL have lead pipes?
Yes. Winthrop Harbor, which serves Winthrop Harbor, reported 13 lead and 0 galvanized-requiring-replacement service lines, plus 804 of unknown material.
Who supplies water to Winthrop Harbor?
EPA's service area maps place most of Winthrop Harbor in Winthrop Harbor's service area (PWSID IL0971950). Zion also serves parts of the city or nearby areas.
How do I check whether my Winthrop Harbor home has a lead service line?
Search your address on Winthrop Harbor's service line inventory map. You can also scratch the pipe where water enters your home: lead is soft, dull gray, scratches to shiny silver and doesn't attract a magnet.
When will lead pipes in Winthrop Harbor be replaced?
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask Winthrop Harbor whether your street is scheduled and whether it covers the private side.