Union County Lake Quality
New Mexico, 1 lakes, average grade C (Fair)
Union County has 1 graded 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. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Clayton Lake Deep Dam (C); the most-stressed is Clayton Lake Deep Dam (C).
Quick Answers for Union County
Planning a trip? Check special fishing regulations for Clayton Lake Deep Dam — or check the official New Mexico fishing regulations.
All Lakes in Union County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Clayton Lake Deep Dam | C | 3.9 ft | - |
Other Counties in New Mexico
See how Union County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near Union County
Top-rated places to stay near Union County
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Source: EPA National Aquatic Resource Surveys, 2026.