Matawinie County Lake Quality
Québec, 110 lakes, average grade A (Excellent)
Matawinie County has 110 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. The county's average grade is A — among the cleanest in Québec. 69 lakes pull an A on their own, and almost none fall into the D or F brackets.
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 Lac Ouareau (A); the most-stressed is Lac de la Belle Montagne (D).
Quick Answers for Matawinie County
Planning a trip? Check special fishing regulations for Lac Ouareau — or check the official Québec fishing regulations.
All Lakes in Matawinie County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Ouareau | A | 16.7 ft | 3.2 µg/L |
| 2 | Lac Provost | A | 19 ft | 3.4 µg/L |
| 3 | Lac SylvèRe | A | 27.9 ft | 2.5 µg/L |
| 4 | Lac Corbeau | A | 15.9 ft | 5 µg/L |
| 5 | Lac des ÎLes | A | 21 ft | 3.1 µg/L |
| 6 | Lac à la Truite | A | - | 8.7 µg/L |
| 7 | Lac Cloutier | A | 17.7 ft | 3.9 µg/L |
| 8 | Lac des Pins | A | 16.1 ft | 4.7 µg/L |
| 9 | Lac Pierre | A | 17.7 ft | 6.7 µg/L |
| 10 | Lac Stevens | A | 16.4 ft | 6.2 µg/L |
| 11 | Lac Beaulac | A | 16.7 ft | 4.7 µg/L |
| 12 | Lac Mondor | A | 15.3 ft | 4.4 µg/L |
| 13 | Lac la Fontaine | A | 15.4 ft | 3 µg/L |
| 14 | Lac Boeuf | A | 18 ft | 3.8 µg/L |
| 15 | Lac à la Truite | A | 20 ft | 4.4 µg/L |
| 16 | Lac du TrèFle | A | 16.2 ft | 4.1 µg/L |
| 17 | Petit Lac du TrèFle | A | 19.4 ft | 3.3 µg/L |
| 18 | Lac Vert | A | 28.5 ft | 4.7 µg/L |
| 19 | Lac Sawin | A | 29.9 ft | 1.9 µg/L |
| 20 | Lac Godon | A | 27.6 ft | 2.3 µg/L |
| 21 | Lac Clair | A | 24 ft | 1.9 µg/L |
| 22 | Lac KaëL | A | 16.4 ft | 10.7 µg/L |
| 23 | Lac Mooney | A | 15.3 ft | 4.8 µg/L |
| 24 | Lac LéGaré | A | 15.4 ft | 4.4 µg/L |
| 25 | Lac Patrick | A | 16.4 ft | 6.2 µg/L |
| 26 | Lac Couture | A | 33.3 ft | 2.7 µg/L |
| 27 | Lac Lane | A | 22.1 ft | 3.9 µg/L |
| 28 | Lac Clair | A | 15.4 ft | 3.9 µg/L |
| 29 | Lac Galipault | A | 24.3 ft | 1.9 µg/L |
| 30 | Lac Miron | A | 21 ft | 6.8 µg/L |
| 31 | Lac Patrick | A | - | 4.3 µg/L |
| 32 | Lac Rouge | A | 22.6 ft | 4.2 µg/L |
| 33 | Lac des FrançAis | A | 12.8 ft | 6.7 µg/L |
| 34 | Lac Archambault | A | 13.5 ft | 3.8 µg/L |
| 35 | Lac Croche | A | 12.8 ft | 5.1 µg/L |
| 36 | Lac Blondin | A | 11.2 ft | 10 µg/L |
| 37 | Lac Quesnel | A | 10.5 ft | 7.6 µg/L |
| 38 | Lac LafrenièRe | A | 10.5 ft | 8 µg/L |
| 39 | Lac Beauchamp | A | 11.5 ft | 6.2 µg/L |
| 40 | Lac Georges | A | 12.1 ft | 5.2 µg/L |
| 41 | Lac Loyer | A | 11.5 ft | 8.4 µg/L |
| 42 | Lac Long | A | 13.8 ft | 6.6 µg/L |
| 43 | Lac Léon | A | 10.5 ft | 6.6 µg/L |
| 44 | Lac Jaune | A | 11 ft | 5.6 µg/L |
| 45 | Lac Grenier | A | 13.3 ft | 3.9 µg/L |
| 46 | Lac Long | A | 10.5 ft | 6.7 µg/L |
| 47 | Lac Louise | A | 10 ft | 6.9 µg/L |
| 48 | Lac Baribeau | A | 13 ft | 5.3 µg/L |
| 49 | Lac du Pimbina | A | 10.2 ft | 5.4 µg/L |
| 50 | Lac Provost | A | 12.5 ft | 5.2 µg/L |
| 51 | Lac BrûLé | A | 13.8 ft | 4.2 µg/L |
| 52 | Lac PréVost | A | 11.5 ft | 4.8 µg/L |
| 53 | Lac à L'Île | A | 11.2 ft | 5.7 µg/L |
| 54 | Lac Kataway | A | 12.8 ft | 4.8 µg/L |
| 55 | Lac Paré | A | 12.6 ft | 5.7 µg/L |
| 56 | Lac Collin | A | 12 ft | 4.8 µg/L |
| 57 | Petit Lac Collin | A | 11.5 ft | 6.4 µg/L |
| 58 | Lac Saint-Louis | A | 10 ft | 6.4 µg/L |
| 59 | Lac Gareau | A | 10.2 ft | 6.6 µg/L |
| 60 | Lac Blanc | A | 11.8 ft | 4.5 µg/L |
| 61 | Lac Rochemaure | A | 13.1 ft | 3.7 µg/L |
| 62 | Lac CréPeau | A | 11.8 ft | 5.2 µg/L |
| 63 | Lac Saint-SéBastien | A | 13.6 ft | 5.1 µg/L |
| 64 | Lac Clermoustier | A | 14.8 ft | 6.8 µg/L |
| 65 | Lac Pauzé | A | 14.1 ft | 5.4 µg/L |
| 66 | Lac Sauvage | A | 14.4 ft | 4.1 µg/L |
| 67 | Lac Clair | A | 12.8 ft | 5 µg/L |
| 68 | Lac Matambin | A | 12.3 ft | 6.8 µg/L |
| 69 | Lac Vert | A | 14.8 ft | 6.2 µg/L |
| 70 | Lac Beaulne | B | 7.1 ft | 8.9 µg/L |
| 71 | RéServoir Taureau | B | 7.7 ft | 9.2 µg/L |
| 72 | Lac Joly | B | 7.5 ft | 9.3 µg/L |
| 73 | Lac Beau Bassin | B | 9.8 ft | 7.4 µg/L |
| 74 | Lac Daniel | B | 7.9 ft | 11.8 µg/L |
| 75 | Lac la Clef | B | 9.2 ft | 7.2 µg/L |
| 76 | Lac des Aulnes | B | 9.8 ft | 6.3 µg/L |
| 77 | Lac Léon | B | 7.5 ft | 6.9 µg/L |
| 78 | Lac Beaulne | B | 9.8 ft | 6.7 µg/L |
| 79 | Lac Noir | B | 7.1 ft | 13.9 µg/L |
| 80 | Lac Pontbriand | B | 8.2 ft | 6.2 µg/L |
| 81 | Lac Bouillon | B | 8.9 ft | 6.5 µg/L |
| 82 | Lac Major | B | 7.5 ft | 10.7 µg/L |
| 83 | Lac du Castor | B | 7.5 ft | 7.1 µg/L |
| 84 | Lac Migué | B | 8.5 ft | 10.4 µg/L |
| 85 | Lac Bourré | B | 7.2 ft | 6.5 µg/L |
| 86 | Lac Blanc | B | 9.7 ft | 6.4 µg/L |
| 87 | Lac Bastien | B | 5.9 ft | 12.9 µg/L |
| 88 | Lac de la FromentièRe | B | 6.6 ft | 8.9 µg/L |
| 89 | Lac Dontigny | B | 5.6 ft | 9.4 µg/L |
| 90 | Lac Marchand | B | 5.7 ft | 14.2 µg/L |
| 91 | Lac CôMe | B | 5.9 ft | 9.5 µg/L |
| 92 | Lac Berthier | B | 8.4 ft | 12.3 µg/L |
| 93 | Lac Lasalle | B | 6.6 ft | 9.6 µg/L |
| 94 | Lac ÉLan | B | 4.6 ft | 12.6 µg/L |
| 95 | Lac Bernard | B | 4.3 ft | 12.1 µg/L |
| 96 | Lac Chantelle | B | 8.5 ft | 9.1 µg/L |
| 97 | Lac à Lunettes | B | 8.2 ft | 11.2 µg/L |
| 98 | Lac du Brochet | B | 8.2 ft | 12.6 µg/L |
| 99 | Lac Delisle | B | 13.1 ft | - |
| 100 | Lac Beaudoin | B | 13.1 ft | - |
| 101 | Lac Lachapelle | B | 3.4 ft | 11.1 µg/L |
| 102 | Lac Canard | B | 7.4 ft | 15.3 µg/L |
| 103 | Lac Rawdon | B | 5.9 ft | 13.3 µg/L |
| 104 | Lac Laurianne | B | 5.6 ft | 8.7 µg/L |
| 105 | Lac Aux Sources | B | 5.4 ft | 19.8 µg/L |
| 106 | Lac Arbour | C | 4.3 ft | 28.1 µg/L |
| 107 | Lac Bibeau | C | 4.3 ft | 28 µg/L |
| 108 | Lac Gervais | C | 4.6 ft | 21.9 µg/L |
| 109 | Lac Sur la Montagne | C | 6.9 ft | - |
| 110 | Lac de la Belle Montagne | D | 3.9 ft | 31.1 µg/L |
Other Counties in Québec
See how Matawinie 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.