Les Pays-d'en-Haut County Lake Quality
Québec, 109 lakes, average grade A (Excellent)
Les Pays-d'en-Haut County has 109 graded lakes, enough that within-county variation matters as much as the county average. Some are deep glacial basins, others are shallow agricultural-watershed waters, and the grade distribution reflects that mix. On average, Les Pays-d'en-Haut County lakes grade an A. That puts it near the top of the Québec county ranking.
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. Lac Farmer (A) is the cleanest in the county.
Quick Answers for Les Pays-d'en-Haut County
Planning a trip? Check special fishing regulations for Lac Farmer — or check the official Québec fishing regulations.
All Lakes in Les Pays-d'en-Haut County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Farmer | A | 19 ft | 4.4 µg/L |
| 2 | Lac ThéOdore | A | 16.1 ft | 5.5 µg/L |
| 3 | Lac Brewer | A | 15.1 ft | 5.8 µg/L |
| 4 | Lac Ashton | A | 15.1 ft | 4.6 µg/L |
| 5 | Lac Violon | A | 15.1 ft | 4.4 µg/L |
| 6 | Lac Saint-Amour | A | 16.4 ft | 6.2 µg/L |
| 7 | Lac Marois | A | 16.4 ft | 5.6 µg/L |
| 8 | Lac Guindon | A | 17.1 ft | 3.9 µg/L |
| 9 | Lac des Seigneurs | A | 18.2 ft | 3.8 µg/L |
| 10 | Lac Morin | A | 18 ft | 4.1 µg/L |
| 11 | Lac Argenté | A | 20.3 ft | 4.9 µg/L |
| 12 | Lac Laurel | A | 19.7 ft | 3.9 µg/L |
| 13 | Lac Wentworth | A | 19.5 ft | 3.3 µg/L |
| 14 | Lac Louise | A | 26.1 ft | 3 µg/L |
| 15 | Lac Ouimet | A | 15.3 ft | 4.7 µg/L |
| 16 | Lac de la Montagne | A | 24 ft | 1.8 µg/L |
| 17 | Lac Saint-Denis | A | 20.5 ft | 2.7 µg/L |
| 18 | Lac Cupidon | A | 15.4 ft | 6.7 µg/L |
| 19 | Lac Saint-Louis | A | 17.2 ft | 4.8 µg/L |
| 20 | Lac Clair | A | 23 ft | 3.7 µg/L |
| 21 | Lac Rond | A | 19.8 ft | 5.1 µg/L |
| 22 | Lac Charlebois | A | 17.7 ft | 3.7 µg/L |
| 23 | Lac des Becs-Scie | A | 18.4 ft | 4.5 µg/L |
| 24 | Lac Purvis | A | 18.5 ft | 3.9 µg/L |
| 25 | Lac Millette | A | 24.8 ft | 3.7 µg/L |
| 26 | Lac de la Cabane | A | 15.1 ft | 3.5 µg/L |
| 27 | Lac des Seize ÎLes | A | 19.8 ft | 3.2 µg/L |
| 28 | Lac Fraser | A | 18.9 ft | 3.2 µg/L |
| 29 | Lac Pilon | A | 17.1 ft | 4.2 µg/L |
| 30 | Lac Castor | A | 15.6 ft | 6.2 µg/L |
| 31 | Lac Croche | A | 14.4 ft | 5.9 µg/L |
| 32 | Lac Loiselle | A | 10.5 ft | 8.6 µg/L |
| 33 | Grand Lac Noir | A | 13.9 ft | 6.4 µg/L |
| 34 | Lac Gustave | A | 14.6 ft | 5.1 µg/L |
| 35 | Lac Noiret | A | 11.8 ft | 6.1 µg/L |
| 36 | Lac Notre-Dame | A | 12.6 ft | 6.1 µg/L |
| 37 | Lac Saint-FrançOis-Xavier | A | 13.8 ft | 5.1 µg/L |
| 38 | Lac Saint-Victor | A | 14.8 ft | 4.4 µg/L |
| 39 | Lac Vert | A | 10.2 ft | 5.4 µg/L |
| 40 | Lac du Coeur | A | 12.5 ft | 5.2 µg/L |
| 41 | Lac Noir | A | 11.2 ft | 7.7 µg/L |
| 42 | Lac à la Truite | A | 10.8 ft | 8.5 µg/L |
| 43 | Lac Sainte-Marie | A | 13.1 ft | 5.4 µg/L |
| 44 | Lac Grothé | A | 13.8 ft | 5 µg/L |
| 45 | Lac Windish | A | 13.9 ft | 7.5 µg/L |
| 46 | Lac Denis | A | 10.5 ft | 7.2 µg/L |
| 47 | Lac Beauchamp | A | 10.7 ft | 7.9 µg/L |
| 48 | Lac des Sommets | A | 10.5 ft | 8 µg/L |
| 49 | Lac Bellevue | A | 10.8 ft | 10.2 µg/L |
| 50 | Lac ÉCho | A | 11.6 ft | 8.3 µg/L |
| 51 | Lac GéMont | A | 11.8 ft | 5.4 µg/L |
| 52 | Lac la Fantaisie | A | 11.5 ft | 7.2 µg/L |
| 53 | Lac Chevreuils | A | 13.1 ft | 6.3 µg/L |
| 54 | Lac Cornu | A | 10.8 ft | 9.6 µg/L |
| 55 | Lac Garry | A | 10.5 ft | 6.5 µg/L |
| 56 | Lac Saint-Joseph | A | 13.8 ft | 5 µg/L |
| 57 | Lac Travers | A | 10.7 ft | 6.9 µg/L |
| 58 | Lac Vingt Sous | A | 13.1 ft | 6.3 µg/L |
| 59 | Lac Boucané | A | 11.5 ft | 7.8 µg/L |
| 60 | Lac Saint-Cyr | A | 12.6 ft | 5 µg/L |
| 61 | Lac Bouchette | A | 14.6 ft | 7.2 µg/L |
| 62 | Lac Bois Franc | A | 14.8 ft | 5.4 µg/L |
| 63 | Lac DéPatie | A | 10.8 ft | 4.9 µg/L |
| 64 | Lac la Grosse | A | 12.1 ft | 5.1 µg/L |
| 65 | Petit Lac Long | A | 14.4 ft | 3.9 µg/L |
| 66 | Lac Long | A | 11.5 ft | 7.6 µg/L |
| 67 | Lac Léon | A | 11.8 ft | 6.2 µg/L |
| 68 | Lac Walfred | A | 11.5 ft | 8.7 µg/L |
| 69 | Lac de L'Alchimiste | A | 12.8 ft | 7 µg/L |
| 70 | Lac des Feuilles | A | 11.2 ft | 7 µg/L |
| 71 | Lac des Roches | A | 13.1 ft | 6 µg/L |
| 72 | Lac Dupuis | A | - | 14.7 µg/L |
| 73 | Lac des Pins | B | 8.7 ft | 8.1 µg/L |
| 74 | Lac Mohawk | B | 7.4 ft | 11.5 µg/L |
| 75 | Petit Lac Sainte-Marie | B | 8.2 ft | 10.5 µg/L |
| 76 | Lac Millette | B | 9.5 ft | 9 µg/L |
| 77 | Lac Suzanne | B | 9.2 ft | 10.6 µg/L |
| 78 | Lac Cook | B | 9.2 ft | 7.5 µg/L |
| 79 | Lac Kanawana | B | 10.5 ft | 8 µg/L |
| 80 | Lac Renaud | B | 9.8 ft | 10.8 µg/L |
| 81 | Lac des Trois FrèRes | B | 9.8 ft | 8.2 µg/L |
| 82 | Lac LéOnard | B | 8.2 ft | 9.1 µg/L |
| 83 | Lac des Chats | B | 8.9 ft | 7.9 µg/L |
| 84 | Lac Breton | B | 7.9 ft | 8.5 µg/L |
| 85 | Lac la RivièRe | B | 9.5 ft | 7.9 µg/L |
| 86 | Lac PréVost | B | 8.5 ft | 12.2 µg/L |
| 87 | Lac BéLanger | B | 7.9 ft | 9.6 µg/L |
| 88 | Lac Violon | B | 7.2 ft | 10.6 µg/L |
| 89 | Lac Grenier | B | 6.9 ft | 9.1 µg/L |
| 90 | Lac Parent | B | 7.9 ft | 8.9 µg/L |
| 91 | Lac Saint-Sauveur | B | 7.9 ft | 10.1 µg/L |
| 92 | Lac Peter | B | 7.9 ft | 8.4 µg/L |
| 93 | Lac à L'Ours | B | 7.2 ft | 12.1 µg/L |
| 94 | Lac Brunet | B | 6.2 ft | 12.2 µg/L |
| 95 | Lac Paradis | B | 4.3 ft | 9.3 µg/L |
| 96 | Lac Lucerne | B | 5.9 ft | 10.7 µg/L |
| 97 | Lac Rochon | B | 6.2 ft | 12.1 µg/L |
| 98 | Lac Beaulne | B | 6.4 ft | 10.7 µg/L |
| 99 | Lac Canard | B | 6.2 ft | 12.7 µg/L |
| 100 | Lac Colette | B | 5.7 ft | 13.1 µg/L |
| 101 | Lac CôMe-Lalande | B | 4.8 ft | 12.8 µg/L |
| 102 | Lac Melançon | B | 6.6 ft | 12.8 µg/L |
| 103 | Lac Corbeil | B | 6.2 ft | 16.3 µg/L |
| 104 | Lac Piché | B | 5.6 ft | 13.5 µg/L |
| 105 | Lac Victor | B | 3.9 ft | 17.7 µg/L |
| 106 | Lac Quevillon | B | 6.2 ft | 10.7 µg/L |
| 107 | Lac Schryer | C | 4.1 ft | 18 µg/L |
| 108 | Lac Johanne | C | 3.4 ft | 19.3 µg/L |
| 109 | Lac Caron | C | 3.8 ft | 31.4 µg/L |
Other Counties in Québec
See how Les Pays-d'en-Haut County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
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Source: EPA National Aquatic Resource Surveys, 2026.