Grade B Lakes, Good
3,206 lakes (22% of lakes we track)
B-grade lakes are typically swimmable on a typical summer day and still productive as fisheries. 3,206 lakes earn a B. The letter is nutrients and algae, not a same-day clearance.
| Lake | County | State | Clarity | Depth | Fish |
|---|---|---|---|---|---|
| Lac Tourbillon | La Jacques-Cartier | QC | 7.2 ft | - | 0 |
| Lac Sergent | Portneuf | QC | 11.2 ft | - | 0 |
| Lac Jally | Montmagny | QC | 8.9 ft | - | 0 |
| Lac Joli | Les Etchemins | QC | 7.2 ft | - | 0 |
| Lac KéNogami | Saguenay–Lac-Saint-Jean | QC | 7.2 ft | - | 0 |
| Lac Nairne | Charlevoix-Est | QC | 10.8 ft | - | 0 |
| Lac Plourde | Rimouski-Neigette | QC | 11.3 ft | - | 0 |
| Lac Bixley | Argenteuil | QC | 7.9 ft | - | 0 |
| Lac Paul | Argenteuil | QC | 8.9 ft | - | 0 |
| Lac Saint-FrançOis | Rivière-du-Loup | QC | 8.2 ft | - | 0 |
| Lac FrançAis | Les Laurentides | QC | 9.8 ft | - | 0 |
| Lac Vaudray | Abitibi-Témiscamingue | QC | 7.5 ft | - | 0 |
| Lac des Pins | Les Pays-d'en-Haut | QC | 8.7 ft | - | 0 |
| Lac Boucher | La Haute-Côte-Nord | QC | 9.8 ft | - | 0 |
| Lac Cormier | La Haute-Côte-Nord | QC | 9.2 ft | - | 0 |
| Lac Lacasse | Les Laurentides | QC | 9.7 ft | - | 0 |
| Lac Beaulne | Matawinie | QC | 7.1 ft | - | 0 |
| Lac Raymond | Les Laurentides | QC | 7.2 ft | - | 0 |
| Lac des FrançAis | Memphrémagog | QC | 9.8 ft | - | 0 |
| Lac Mcgill | Montcalm | QC | 6.9 ft | - | 0 |
| Lac Colette | Montcalm | QC | 6.9 ft | - | 0 |
| Lac Brochet | Maria-Chapdelaine | QC | 7.9 ft | - | 0 |
| Lac Charest | Mékinac | QC | 9.2 ft | - | 0 |
| Lac des Huit Milles | La Matapédia | QC | 9.8 ft | - | 0 |
| Lac Ludger | Les Laurentides | QC | 8.2 ft | - | 0 |
| Lac Otis | Le Fjord-du-Saguenay | QC | 9.8 ft | - | 0 |
| Lac des Trois Milles | Le Granit | QC | 7.9 ft | - | 0 |
| Lac Labrecque | Lac-Saint-Jean-Est | QC | 7.7 ft | - | 0 |
| Lac des Copains | Le Fjord-du-Saguenay | QC | 7.4 ft | - | 0 |
| Lac Beauchamp | Abitibi | QC | 8.9 ft | - | 0 |
| Lac du Moulin | Urban agglomeration of Longueuil | QC | 10.5 ft | - | 0 |
| RéServoir Taureau | Matawinie | QC | 7.7 ft | - | 0 |
| Lac Seigneurial | Urban agglomeration of Longueuil | QC | 11.8 ft | - | 0 |
| Lac HéRoux | Maskinongé | QC | 9.8 ft | - | 0 |
| Lac Joly | Matawinie | QC | 7.5 ft | - | 0 |
| Lac des Commissaires | Le Domaine-du-Roy | QC | 6.9 ft | - | 0 |
| Lac MéKinac | Mékinac | QC | 8.9 ft | - | 0 |
| Lac ÉCarté | Le Domaine-du-Roy | QC | 9.2 ft | - | 0 |
| Lac Francis | Antoine-Labelle | QC | 8.9 ft | - | 0 |
| Lac de L'Est | Les Appalaches | QC | 9.5 ft | - | 0 |
| Lac à la Truite | Les Appalaches | QC | 8.9 ft | - | 0 |
| Lac Osman | Le Fjord-du-Saguenay | QC | 9.4 ft | - | 0 |
| Lac à la Croix | Le Fjord-du-Saguenay | QC | 9.4 ft | - | 0 |
| Lac Beau Bassin | Matawinie | QC | 9.8 ft | - | 0 |
| Lac Daniel | Matawinie | QC | 7.9 ft | - | 0 |
| Lac Papineau | Les Laurentides | QC | 8.9 ft | - | 0 |
| Lac la Clef | Matawinie | QC | 9.2 ft | - | 0 |
| Lac Mohawk | Les Pays-d'en-Haut | QC | 7.4 ft | - | 0 |
| Petit Lac Sainte-Marie | Les Pays-d'en-Haut | QC | 8.2 ft | - | 0 |
| Lac Magnan | Maskinongé | QC | 9.2 ft | - | 0 |
| Lac des Amoureux | Maskinongé | QC | 7.9 ft | - | 0 |
| Lac Desforges | Les Laurentides | QC | 11.2 ft | - | 0 |
| Petit Lac de L'Orignal | Les Laurentides | QC | 8.2 ft | - | 0 |
| Lac Fontaine | La Haute-Côte-Nord | QC | 9 ft | - | 0 |
| Lac Chevreuil | Argenteuil | QC | 6.7 ft | - | 0 |
| Lac Perreault | Portneuf | QC | 7.5 ft | - | 0 |
| Lac Desmarais | Le Val-Saint-François | QC | 8.5 ft | - | 0 |
| Lac Bran de Scie | Memphrémagog | QC | 8.5 ft | - | 0 |
| Lac Leclerc | Memphrémagog | QC | 9.8 ft | - | 0 |
| Lac Maggie | Le Domaine-du-Roy | QC | 6.9 ft | - | 0 |
| Lac de la CanardièRe | Les Laurentides | QC | 9.5 ft | - | 0 |
| Lac Donlon | Manicouagan | QC | 6.9 ft | - | 0 |
| Lac HéNault | D'Autray | QC | 7.1 ft | - | 0 |
| Lac Millette | Les Pays-d'en-Haut | QC | 9.5 ft | - | 0 |
| Lac Georges | Pontiac | QC | 9.5 ft | - | 0 |
| Petit Lac du Castor Blanc | La Vallée-de-la-Gatineau | QC | 7.5 ft | - | 0 |
| Lac ThéRèSe | Manicouagan | QC | 8.2 ft | - | 0 |
| Lac Saint-Alexis | Maskinongé | QC | 7.5 ft | - | 0 |
| Lac No Man | Argenteuil | QC | 8.9 ft | - | 0 |
| Lac Renoir | Argenteuil | QC | 9.4 ft | - | 0 |
| Lac Rond | Argenteuil | QC | 8 ft | - | 0 |
| Lac Suzanne | Les Pays-d'en-Haut | QC | 9.2 ft | - | 0 |
| Lac Rouge | La Matapédia | QC | 9.4 ft | - | 0 |
| Lac du Club de Conservation | Beauce-Sartigan | QC | 6.9 ft | - | 0 |
| Lac GuéRin | Antoine-Labelle | QC | 6.9 ft | - | 0 |
| Lac Neigette | Rimouski-Neigette | QC | 10.3 ft | - | 0 |
| Lac Cook | Les Pays-d'en-Haut | QC | 9.2 ft | - | 0 |
| Lac BrûLé | Les Laurentides | QC | 7.9 ft | - | 0 |
| Lac Noir | Les Laurentides | QC | 8.5 ft | - | 0 |
| Lac des Bouleaux | Le Domaine-du-Roy | QC | 9.5 ft | - | 0 |
| Lac Bouchette | Le Domaine-du-Roy | QC | 7.4 ft | - | 0 |
| Lac Ouiatchouan | Le Domaine-du-Roy | QC | 7.1 ft | - | 0 |
| Lac PrinzèLes | Le Domaine-du-Roy | QC | 9.7 ft | - | 0 |
| Lac la PêChe | Le Domaine-du-Roy | QC | 9.4 ft | - | 0 |
| Lac des Aulnes | Matawinie | QC | 9.8 ft | - | 0 |
| Lac Léon | Matawinie | QC | 7.5 ft | - | 0 |
| Lac Beaulne | Matawinie | QC | 9.8 ft | - | 0 |
| Lac Gamelin | Le Fjord-du-Saguenay | QC | 8.7 ft | - | 0 |
| Lac Kanawana | Les Pays-d'en-Haut | QC | 10.5 ft | - | 0 |
| Lac Noir | Matawinie | QC | 7.1 ft | - | 0 |
| Lac Aux Perles | La Haute-Côte-Nord | QC | 8.2 ft | - | 0 |
| Lac Renaud | Les Pays-d'en-Haut | QC | 9.8 ft | - | 0 |
| Lac Indien | La Matapédia | QC | 6.9 ft | - | 0 |
| Lac des Trois FrèRes | Les Pays-d'en-Haut | QC | 9.8 ft | - | 0 |
| Lac Noir | Mékinac | QC | 9.8 ft | - | 0 |
| Lac LéOnard | Les Pays-d'en-Haut | QC | 8.2 ft | - | 0 |
| Lac Pontbriand | Matawinie | QC | 8.2 ft | - | 0 |
| Lac Bouillon | Matawinie | QC | 8.9 ft | - | 0 |
| Lac Major | Matawinie | QC | 7.5 ft | - | 0 |
| Lac Mcgrey | D'Autray | QC | 9.8 ft | - | 0 |
Showing 100 of 3,206 Grade B lakes.
Frequently Asked Questions
How many lakes have a grade of B?
There are 3,206 Grade B (Good) lakes across the 49 states and 2 Canadian provinces LakeQuality covers. That is 22% of the 14,370 lakes we track. Lakes without enough recent nutrient or algae samples are published as Not Rated — they are not in this count and they are not an F.
What does a Grade B mean?
Grade B means nutrients and algae are in a favourable EPA condition class for that ecoregion — not the cleanest bracket, not stressed. Clarity is shown separately. A B is not a same-day swim clearance.
Featured Grade B Lakes
La Jacques-Cartier County, QC · 7.2 ft clarity
Portneuf County, QC · 11.2 ft clarity
Montmagny County, QC · 8.9 ft clarity
Les Etchemins County, QC · 7.2 ft clarity
Saguenay–Lac-Saint-Jean County, QC · 7.2 ft clarity
Charlevoix-Est County, QC · 10.8 ft clarity
Source: EPA National Aquatic Resource Surveys, 2026.