B
Sudbury District County Lake Quality
Ontario, 264 lakes, average grade B (Good)
Sudbury District County has 264 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-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
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 Apsey Lake (A); the most-stressed is Bethel Lake (D).
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Quick Answers for Sudbury District County
Cleanest lakes in Sudbury District County →Cleanest lakes in Ontario →Safest swimming lakes in Ontario →
Planning a trip? Check special fishing regulations for Apsey Lake — or check the official Ontario fishing regulations.
All Lakes in Sudbury District County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Apsey Lake | A | - | 9.3 µg/L |
| 2 | Armstrong Lake | A | 15.1 ft | 6.1 µg/L |
| 3 | Big Vermilion Lake | A | 19.7 ft | 6.7 µg/L |
| 4 | Broder Lake | A | 16.4 ft | 5 µg/L |
| 5 | Clearwater Lake | A | 20.2 ft | - |
| 6 | Dixon Lake | A | 19.7 ft | 4.7 µg/L |
| 7 | Ella Lake | A | 16.9 ft | 11.8 µg/L |
| 8 | Fairbank Lake | A | 23 ft | 4.9 µg/L |
| 9 | Frenchman Lake | A | 22.1 ft | 6.9 µg/L |
| 10 | George Lake | A | 42.7 ft | - |
| 11 | Hannah Lake | A | 15.7 ft | 4.9 µg/L |
| 12 | Joe Lake | A | 23 ft | 4.2 µg/L |
| 13 | Kecil Lake | A | - | 8.6 µg/L |
| 14 | Killarney Lake | A | 42.7 ft | - |
| 15 | Kukagami Lake | A | 23.6 ft | 6.9 µg/L |
| 16 | Little Bear Lake | A | 18 ft | - |
| 17 | Little Panache Lake | A | 16.4 ft | - |
| 18 | Little Pogamasing Lake | A | 18.4 ft | 6.5 µg/L |
| 19 | Lohi Lake | A | 21.2 ft | 4.6 µg/L |
| 20 | Makada Lake | A | 16.7 ft | 8.1 µg/L |
| 21 | Maple Lake | A | 15.4 ft | 7.3 µg/L |
| 22 | Matagamasi Lake | A | 20.8 ft | 4.4 µg/L |
| 23 | Muriel Lake | A | 21.3 ft | - |
| 24 | Nelson Lake | A | 26.2 ft | 2.8 µg/L |
| 25 | Norway Lake | A | 39.4 ft | - |
| 26 | Osa Lake | A | 42.7 ft | - |
| 27 | Panache Lake | A | 16.4 ft | 6.5 µg/L |
| 28 | Plunge Lake | A | 16.7 ft | 6.1 µg/L |
| 29 | Raft Lake | A | 21 ft | 5.3 µg/L |
| 30 | Tilton Lake | A | 15.4 ft | 5.3 µg/L |
| 31 | Walker Lake | A | 18 ft | - |
| 32 | Windy Lake | A | 22.6 ft | 3.9 µg/L |
| 33 | Burnt Lake | A | - | 10.2 µg/L |
| 34 | Ham Lake | A | - | 16.4 µg/L |
| 35 | Horseshoe Lake | A | - | 18.1 µg/L |
| 36 | Lower White Oak Lake | A | - | 7.7 µg/L |
| 37 | Mccrea Lake | A | - | 11.5 µg/L |
| 38 | Tyson Lake | A | - | 9.7 µg/L |
| 39 | White Oak Lake | A | - | 5.4 µg/L |
| 40 | Acheson Lake | A | - | 6.9 µg/L |
| 41 | Admiral Lake | A | - | 7.6 µg/L |
| 42 | Antrim Lake | A | - | 7.8 µg/L |
| 43 | Baie Fine Lake | A | - | 5.6 µg/L |
| 44 | Bear Lake | A | 15.4 ft | 7.3 µg/L |
| 45 | Benner Lake | A | - | 3.9 µg/L |
| 46 | Big Squaw Lake | A | - | 6.7 µg/L |
| 47 | Bigfour Lake | A | - | 10.6 µg/L |
| 48 | Camp Lake | A | - | 4.1 µg/L |
| 49 | Chief Lake | A | - | 3.9 µg/L |
| 50 | Clearwater Lake | A | - | 4.9 µg/L |
| 51 | Crowley Lake | A | - | 4.2 µg/L |
| 52 | Daisy Lake | A | - | 4.5 µg/L |
| 53 | Dividing Lake | A | - | 9.2 µg/L |
| 54 | Dixon Lake | A | - | 5.4 µg/L |
| 55 | Ella Lake | A | - | 5.5 µg/L |
| 56 | Forest Lake | A | - | 4.3 µg/L |
| 57 | Friday Lake | A | - | 6 µg/L |
| 58 | Garson Lake | A | - | 13.1 µg/L |
| 59 | Gordon Lake | A | - | 8.7 µg/L |
| 60 | Grant Lake | A | - | 9.9 µg/L |
| 61 | Grassy Lake | A | - | 14.3 µg/L |
| 62 | Grassy Lake | A | - | 8.2 µg/L |
| 63 | Greens Lake | A | - | 6.8 µg/L |
| 64 | Groundhog Lake | A | - | 13.2 µg/L |
| 65 | Halfway Lake | A | - | 4.6 µg/L |
| 66 | Houston Lake | A | - | 10.1 µg/L |
| 67 | Iron Lake | A | - | 4 µg/L |
| 68 | Jerry Lake | A | - | 2.1 µg/L |
| 69 | Jess Lake | A | - | 9 µg/L |
| 70 | Johnnie Lake | A | - | 5.4 µg/L |
| 71 | Kasten Lake | A | - | 9.7 µg/L |
| 72 | Kenetogami Lake | A | - | 7.4 µg/L |
| 73 | Kumska Lake | A | - | 5.4 µg/L |
| 74 | Landers Lake | A | - | 4.4 µg/L |
| 75 | Laundrie Lake | A | - | 6.7 µg/L |
| 76 | Leask Lake | A | - | 4.8 µg/L |
| 77 | Linton Lake | A | - | 5.2 µg/L |
| 78 | Little Raft Lake | A | - | 8.1 µg/L |
| 79 | Magog Lake | A | - | 7.1 µg/L |
| 80 | Moray Lake | A | - | 4.8 µg/L |
| 81 | Nabakwasi Lake | A | - | 9 µg/L |
| 82 | Onwatin Lake | A | - | 7.9 µg/L |
| 83 | Parting Lake | A | - | 9.9 µg/L |
| 84 | Peter Lake | A | - | 6.4 µg/L |
| 85 | Pilgrim Lake | A | - | 3.9 µg/L |
| 86 | Pilon Lake | A | - | 5.3 µg/L |
| 87 | Pine Lake | A | - | 4.7 µg/L |
| 88 | Prune Lake | A | 16.4 ft | 5.1 µg/L |
| 89 | Rawson Lake | A | 17.4 ft | 4.7 µg/L |
| 90 | Red Deer Lake | A | - | 18.8 µg/L |
| 91 | Sam Martin Lake | A | - | 4.6 µg/L |
| 92 | Seagram Lake | A | - | 3.8 µg/L |
| 93 | Semple Lake | A | - | 6.6 µg/L |
| 94 | Sewell Lake | A | - | 10.5 µg/L |
| 95 | Shining Tree Lake | A | - | 9 µg/L |
| 96 | Simmons Lake | A | - | 15.4 µg/L |
| 97 | Skill Lake | A | - | 10.3 µg/L |
| 98 | Slate Rock Lake | A | - | 10.5 µg/L |
| 99 | St Jean Lake | A | - | 11.7 µg/L |
| 100 | St Pothier Lake | A | - | 16.4 µg/L |
| 101 | Sugarbush Lake | A | - | 4.9 µg/L |
| 102 | Tatachikapika Lake | A | - | 9.9 µg/L |
| 103 | Tube Lake | A | - | 6.9 µg/L |
| 104 | Wavy Lake | A | - | 6.2 µg/L |
| 105 | Welcome Lake | A | - | 7.8 µg/L |
| 106 | Whitson Lake | A | - | 6.7 µg/L |
| 107 | Avery Lake | A | 18 ft | 4.6 µg/L |
| 108 | Borden Lake | A | 18.7 ft | 6.4 µg/L |
| 109 | Chrysler Lake | A | 19 ft | 9.5 µg/L |
| 110 | Chiniguchi Lake | A | 20 ft | 3 µg/L |
| 111 | Dennie Lake | A | 32.8 ft | 2.9 µg/L |
| 112 | Donald Lake | A | 32.8 ft | 2.5 µg/L |
| 113 | Emerald Lake | A | 32 ft | 2.7 µg/L |
| 114 | Florence Lake | A | 25.9 ft | - |
| 115 | Green Lake | A | 19 ft | 5.6 µg/L |
| 116 | Kettyle Lake | A | 32.8 ft | 2.6 µg/L |
| 117 | Little Wawa Lake | A | 16.8 ft | 14.7 µg/L |
| 118 | Regan Lake | A | 24.6 ft | 3.3 µg/L |
| 119 | Wanapitei Lake | A | 16.4 ft | 4 µg/L |
| 120 | Agnew Lake | A | 11 ft | 6 µg/L |
| 121 | Carlyle Lake | A | 12.3 ft | 5.7 µg/L |
| 122 | Edith Lake | A | 15.1 ft | 26.2 µg/L |
| 123 | Geneva Lake | A | 14.8 ft | 5.9 µg/L |
| 124 | Griffin Lake | A | 14.8 ft | 10.1 µg/L |
| 125 | Hanmer Lake | A | 14.8 ft | 8.9 µg/L |
| 126 | Hazen Lake | A | 10.2 ft | 8.2 µg/L |
| 127 | Lang Lake | A | 13.8 ft | 11.5 µg/L |
| 128 | Mcfarlane Lake | A | 13.6 ft | 10.3 µg/L |
| 129 | Ministic Lake | A | 13.5 ft | 10.8 µg/L |
| 130 | Nepahwin Lake | A | 12.1 ft | 14.5 µg/L |
| 131 | Onaping Lake | A | 11.8 ft | 5.6 µg/L |
| 132 | Portage Lake | A | 14.8 ft | 17.4 µg/L |
| 133 | Ramsey Lake | A | 13.1 ft | 8.3 µg/L |
| 134 | Richard Lake | A | 13.1 ft | 10.4 µg/L |
| 135 | Silver Lake | A | 11.5 ft | 5.5 µg/L |
| 136 | Trout Lake | A | 11.5 ft | 6.4 µg/L |
| 137 | Wahnapitei Lake | A | 14.1 ft | 5.5 µg/L |
| 138 | Wanapitei River Lake | A | 10.7 ft | 5.5 µg/L |
| 139 | Brodill Lake | A | 12.1 ft | 5.6 µg/L |
| 140 | Cucumber Lake | A | 14.8 ft | 4.5 µg/L |
| 141 | Ferrier Lake | A | 14.8 ft | 14.3 µg/L |
| 142 | Nemegosenda Lake | A | 11.2 ft | 6.4 µg/L |
| 143 | Rushbrook Lake | A | 14.8 ft | 10.1 µg/L |
| 144 | Venetian Lake | A | 12.1 ft | 6.5 µg/L |
| 145 | Bigwood Lake | A | 10.2 ft | 6.5 µg/L |
| 146 | Borden Lake | A | 13 ft | 6.9 µg/L |
| 147 | Como Lake | A | 14.1 ft | 8.5 µg/L |
| 148 | Cree Lake | A | 13.1 ft | 11.8 µg/L |
| 149 | Hanson Lake | A | 14.8 ft | 7.6 µg/L |
| 150 | Hardiman Lake | A | 10.5 ft | 7.3 µg/L |
| 151 | Ketchini Lake | A | 12.8 ft | 6.2 µg/L |
| 152 | Klondyke Lake | A | 11.5 ft | 5.2 µg/L |
| 153 | Little Venetian Lake | A | 10.5 ft | 4 µg/L |
| 154 | Mclennan Lake | A | 11.3 ft | 11.2 µg/L |
| 155 | Ninegee Lake | A | 13.8 ft | 7.4 µg/L |
| 156 | Onaping Lake | A | 11.5 ft | 4.8 µg/L |
| 157 | Oshawong Lake | A | 11.5 ft | 6.4 µg/L |
| 158 | Panache Lake | A | 11.5 ft | 4.8 µg/L |
| 159 | Pogamasing Lake | A | 13.1 ft | 5.9 µg/L |
| 160 | Resound Lake | A | 12.8 ft | 5.4 µg/L |
| 161 | Rollo Lake | A | 10.7 ft | 6.7 µg/L |
| 162 | Scotia Lake | A | 10.7 ft | 4.1 µg/L |
| 163 | Upper Kasasway Lake | A | 11.5 ft | 11.3 µg/L |
| 164 | Wakami Lake | A | 10.2 ft | 8.8 µg/L |
| 165 | Ashigami Lake | B | 14.1 ft | - |
| 166 | Balsam Lake | B | 12.5 ft | - |
| 167 | Beaver Lakes | B | 7.4 ft | 19.8 µg/L |
| 168 | Bell Lake | B | 14.8 ft | - |
| 169 | Cutler Lake | B | 14.1 ft | - |
| 170 | David Lake | B | 14.1 ft | - |
| 171 | French River Lake | B | 9.2 ft | 11.9 µg/L |
| 172 | Gough Lake | B | 14.8 ft | - |
| 173 | Hannah Lake | B | 11.5 ft | - |
| 174 | Harry Lake | B | 10.2 ft | - |
| 175 | Ironside Lake | B | 9.2 ft | 5.6 µg/L |
| 176 | Ivanhoe Lake | B | 6.9 ft | 10.1 µg/L |
| 177 | Kakakiwaganda Lake | B | 9.5 ft | 9.6 µg/L |
| 178 | Kebsquasheshing R Lake | B | 9.8 ft | 11.1 µg/L |
| 179 | La Cloche Lake | B | 8.9 ft | 12.6 µg/L |
| 180 | Little Ella Lake | B | 9.2 ft | 18.2 µg/L |
| 181 | Long Lake | B | 13.5 ft | - |
| 182 | Lower French R Delta Lake | B | 8.9 ft | 13.6 µg/L |
| 183 | Mattagami River Lake | B | 10.5 ft | - |
| 184 | Mesomikenda Lake | B | 8.4 ft | 6.5 µg/L |
| 185 | Middle Lake | B | 14.3 ft | - |
| 186 | Ramsey Lake | B | 14.8 ft | - |
| 187 | Three Mile Lake | B | 12.5 ft | - |
| 188 | Weston Lake | B | 8.2 ft | 13.1 µg/L |
| 189 | Whitewater Lake | B | 8.4 ft | 11.4 µg/L |
| 190 | Bass Lake | B | - | 20 µg/L |
| 191 | Mccharles Lake | B | - | 29.8 µg/L |
| 192 | Horwood Lake | B | 6.7 ft | 10.1 µg/L |
| 193 | Megisan Lake | B | 6.9 ft | 6.1 µg/L |
| 194 | Wawiagama Lake | B | 9.8 ft | 9.4 µg/L |
| 195 | Windermere Lake | B | 6.9 ft | 6.7 µg/L |
| 196 | Agnew Lake | B | 7.2 ft | 10.4 µg/L |
| 197 | Biscotasi Lake | B | 9 ft | 8.5 µg/L |
| 198 | Caesar Lake | B | 9.7 ft | 7.9 µg/L |
| 199 | Carty Lake | B | 6.6 ft | 10.5 µg/L |
| 200 | Denyes Lake | B | 7.2 ft | 11.2 µg/L |
| 201 | Dumbell Lake | B | 9.2 ft | 11.8 µg/L |
| 202 | Dungaree Lake | B | 8.2 ft | 10.1 µg/L |
| 203 | Floranna Lake | B | 7.5 ft | 7.8 µg/L |
| 204 | Goldie Lake | B | 9.2 ft | 4 µg/L |
| 205 | Helen Lake | B | 8.2 ft | 6.7 µg/L |
| 206 | Indian Lake | B | 8.2 ft | 7.1 µg/L |
| 207 | Kalaco Lake | B | 9 ft | 7.1 µg/L |
| 208 | Kasasway Lake | B | 9.8 ft | 11.3 µg/L |
| 209 | Little Burwash Lake | B | 8 ft | 6.4 µg/L |
| 210 | Makami Lake | B | 7.2 ft | 8.8 µg/L |
| 211 | Missinabi Lake | B | 7.5 ft | 5.3 µg/L |
| 212 | Moose Lake | B | 7.5 ft | 7.7 µg/L |
| 213 | Muskasenda Lake | B | 8 ft | 10.1 µg/L |
| 214 | Opeepeesway Lake | B | 8.9 ft | 11.5 µg/L |
| 215 | Prairie Bee Lake | B | 7.9 ft | 5 µg/L |
| 216 | Rice Lake | B | 6.9 ft | 12.6 µg/L |
| 217 | Rodd Lake | B | 13.1 ft | - |
| 218 | Rome Lake | B | 7.2 ft | 10.4 µg/L |
| 219 | Rose Lake | B | 7.9 ft | 8.8 µg/L |
| 220 | Rush Lake | B | 6.7 ft | 10.5 µg/L |
| 221 | Solski Lake | B | 9.8 ft | 6.6 µg/L |
| 222 | Stetham Lake | B | 8.2 ft | 9.1 µg/L |
| 223 | White Pine Lake | B | 8.5 ft | 5.8 µg/L |
| 224 | Akweskwa Lake | B | 3.6 ft | 11.4 µg/L |
| 225 | Bear Lake | B | 6.6 ft | 10 µg/L |
| 226 | Boulder Lake | B | 4.6 ft | 10.7 µg/L |
| 227 | Deerfoot Lake | B | 4.9 ft | 13 µg/L |
| 228 | Keith Lake | B | 3.9 ft | 12 µg/L |
| 229 | Low Water Lake | B | 4.8 ft | 10.9 µg/L |
| 230 | Marquette Lake | B | 4.9 ft | 10.9 µg/L |
| 231 | Minisinakwa Lake | B | 5.9 ft | 14.4 µg/L |
| 232 | Nepewassi Lake | B | 6.6 ft | 13.9 µg/L |
| 233 | Paudash Lake | B | 6.4 ft | 6.5 µg/L |
| 234 | Singed Tree Lake | B | 4.6 ft | 12.1 µg/L |
| 235 | Three Corner Lake | B | 4.8 ft | 13.6 µg/L |
| 236 | White Duck Lake | B | 3.6 ft | 11.7 µg/L |
| 237 | Flame Lake | B | 6.6 ft | 6.6 µg/L |
| 238 | Holden Lake | B | 4.9 ft | 13.1 µg/L |
| 239 | Kapiskong Lake | B | 6.6 ft | 10.8 µg/L |
| 240 | Katagi Lake | B | 5.2 ft | 9.9 µg/L |
| 241 | Little Ridley Lake | B | 4.9 ft | 13.5 µg/L |
| 242 | Lower Muldrew Lake | B | 5.7 ft | 8.8 µg/L |
| 243 | Mattagami Lake | B | 6.2 ft | 8.5 µg/L |
| 244 | Mesomikenda Lake | B | 6.6 ft | 6.1 µg/L |
| 245 | Ninth Lake | B | 4.6 ft | 14.7 µg/L |
| 246 | Wabagishik Lake | B | 5.9 ft | 15.2 µg/L |
| 247 | Wasasinka Lake | B | 6.6 ft | 8 µg/L |
| 248 | Wenebegon Lake | B | 5.2 ft | 13.5 µg/L |
| 249 | Crooked Lake | C | 8.2 ft | - |
| 250 | Freeland Lake | C | 9.8 ft | - |
| 251 | Kusk Lake | C | 8.2 ft | - |
| 252 | Minnow Lake | C | 4.3 ft | 23.3 µg/L |
| 253 | Pike Lake | C | 7.5 ft | - |
| 254 | Robinson Lake | C | 4.3 ft | 27.2 µg/L |
| 255 | St Charles Lake | C | 8.9 ft | - |
| 256 | Vermilion Lake | C | 7.5 ft | - |
| 257 | Mud Lake | C | - | 42.6 µg/L |
| 258 | Kelly Lake | C | - | 48.4 µg/L |
| 259 | Upper Sturgeon Lake | C | 1.6 ft | 17 µg/L |
| 260 | Simon Lake | C | 9.8 ft | 73.9 µg/L |
| 261 | Bethel Lake | D | 4.4 ft | - |
| 262 | Bugg Lake | D | 6.2 ft | - |
| 263 | Dill Lake | D | 4.3 ft | - |
| 264 | Bear Lake | D | 2.5 ft | 41.6 µg/L |
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Source: EPA National Aquatic Resource Surveys, 2026.