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Where does the tap water come from?

Each ZIP is colored by the community water system that serves the most of its residents (2020 census block populations against EPA service areas), traced through any wholesale purchases to the utility that actually treats the water. A ZIP is hatched only when more than half of its residents live outside every mapped system, which in Ohio means private wells.

1,233 of 1,233 ZIPs have data.

Lake Erie · 124 Ohio River · 55 Inland rivers · 63 Reservoirs & inland lakes · 99 Groundwater (wells) · 332 Mostly private wells · 560

Source

U.S. EPA SDWIS and Community Water System Service Area Boundaries (v3, 2026), Ohio EPA primacy data, 2020 census blocks: the system serving most residents, traced through purchases to the treating utility; Ohio EPA 2023 Sewer and Water Rate Survey (Ohio State, May 2025) for household bills; Ohio EPA DEFA loan awards since 2016 for the loans paragraph

EPA SDWIS · EPA service area boundaries · Ohio EPA drinking water · Ohio EPA rate survey

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Cracked Buckeye (Open Shower Co), "Where the water comes from", https://crackedbuckeye.com/topics/class/, built 2026-09-16, accessed [date].

Machine-readable: /api/topics/class.json (open JSON, CC BY 4.0 for the compilation; the underlying records keep their own terms) · How to cite · Report a correction · Built 2026-09-16