Jefferson County, NY
drinking water quality
113,140 residents · 156 public water systems · 38 ZIP codes
EPA sampled 4 of 156 public water systems here, together serving about 72,601 people. The highest reading was PFOA at 7.3 ng/L at Watertown City. 1 of the sampled system was above a federal limit. Last sampled 8/13/2024.
What was found
| Compound | Highest result | Federal limit | Ratio |
|---|---|---|---|
| PFOA | 7.3 ng/L | 4 ng/L | 1.8× |
| PFHxS | 3.9 ng/L | 10 ng/L | 0.4× |
Health-based violations
Separately from PFAS, EPA records 51 health-based violations across 16 of the county’s water systems since 2020, the most recent in 2025. They involved contaminant 0999, contaminant 4020, contaminant 4030, haloacetic acids, trihalomethanes, contaminant 1017.
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 Jefferson County
13601 · 13602 · 13603 · 13605 · 13606 · 13607 · 13608 · 13611 · 13612 · 13615 · 13616 · 13618 · 13619 · 13622 · 13624 · 13628 · 13632 · 13634 · 13636 · 13637 · 13638 · 13640 · 13641 · 13643 · 13650 · 13651 · 13656 · 13659 · 13661 · 13673 · 13674 · 13675 · 13679 · 13682 · 13685 · 13691 · 13692 · 13693
Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.