Madison County Lake Quality
New York, 14 lakes — no lake here has enough monitoring data for a grade
Madison County has 14 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. No lake in Madison County has enough sampling behind it for an A–F grade yet. The 14 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.
Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed.
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Quick Answers for Madison County
Planning a trip? Check special fishing regulations for Bradley Brook Reservoir — or check the official New York fishing regulations.
All Lakes in Madison County
14 lakes · 0 graded, 14 not rated0 graded lakes · 14 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NRBradley Brook ReservoirMadison | NR | 20.7 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NREarlville LakeMadison | NR | 7.8 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRHatch LakeMadison | NR | 13.4 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRDeruyter ReservoirMadison | NR | 17.6 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake MoraineMadison | NR | 20.3 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NREaton ReservoirMadison | NR | 18.2 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRTuscarora LakeMadison | NR | 20.5 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRCazenovia LakeMadison | NR | 16.7 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRPoolville PondMadison | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRMadison LakeMadison | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLeland PondMadison | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWoodman PondMadison | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLebanon ReservoirMadison | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRTorpy PondMadison | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
Lake Match
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Other Counties in New York
See how Madison County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.