Madison County, NY
drinking water quality
67,072 residents · 94 public water systems · 25 ZIP codes
EPA sampled 5 of 94 public water systems here, together serving about 21,620 people. Last sampled 9/9/2024.
Health-based violations
Separately from PFAS, EPA records 15 health-based violations across 10 of the county’s water systems since 2020, the most recent in 2025. They involved contaminant 1017, contaminant null, contaminant 1028, contaminant 0700, arsenic, trihalomethanes.
What this means
PFAS are industrial chemicals that EPA describes as breaking down only very slowly in the environment. In April 2024 EPA set the first enforceable national limits: 4 ng/L for PFOA and PFOS, 10 ng/L for PFHxS, PFNA and GenX.
These figures are county-level and come from EPA’s sampling of public water systems. They describe the worst result found in the county, not what comes out of any particular tap — that depends on which system serves the address, and on the plumbing in the building. A private well is not covered by this programme at all.
ZIP codes in Madison County
13030 · 13032 · 13035 · 13037 · 13052 · 13061 · 13072 · 13082 · 13122 · 13134 · 13163 · 13310 · 13314 · 13332 · 13334 · 13346 · 13355 · 13364 · 13402 · 13408 · 13409 · 13418 · 13421 · 13484 · 13485
Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.