St. Martin Parish County Lake Quality
Louisiana, 6 lakes, average grade F (Algae-prone)
Only 6 lakes in St. Martin Parish County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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. Lake Palourde East of Fairville (F) is the cleanest in the county.
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Quick Answers for St. Martin Parish County
Planning a trip? Check special fishing regulations for Lake Palourde East of Fairville — or check the official Louisiana fishing regulations.
All Lakes in St. Martin Parish County
6 lakes · 5 graded, 1 not rated5 graded lakes · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | FLake Palourde East of FairvilleSt. Martin Parish | F | No recent samples | No recent samples | 44.3 µg/L | No recent samples | Not recorded |
| 2 | FLake Palourde North of RamosSt. Martin Parish | F | No recent samples | 195 µg/L | 51.5 µg/L | No recent samples | Not recorded |
| 3 | FLake Palourde Northeast of GreenwoodSt. Martin Parish | F | No recent samples | No recent samples | 44.4 µg/L | No recent samples | Not recorded |
| 4 | FLake Palourde Northwest of GibsonSt. Martin Parish | F | No recent samples | 530 µg/L | 38 µg/L | No recent samples | Not recorded |
| 5 | FLake Palourde West-Northwest of GibsonSt. Martin Parish | F | No recent samples | 405 µg/L | 40.4 µg/L | No recent samples | Not recorded |
| NRLake Palourde North-Northeast of AmeliaSt. Martin Parish | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Louisiana
See how St. Martin Parish County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.