| Sunfish Lake | |
|---|---|
&sq=&lang=&file=File:Canada_Ontario_relief_location_map.jpg)  Sunfish Lake | |
| Location | Wilmot Township, Ontario |
| Coordinates | 43°28′27″N 80°38′03″W / 43.4741°N 80.6343°W |
| Lake type | meromictic |
| Basin countries | Canada |
| Surface area | 25 ha (62 acres) |
| Max. depth | 19 m (62 ft)[1] |
| Settlements | St. Agatha |
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Sunfish Lake is a small, 25 hectare meromictic lake located north-west of Waterloo, Ontario, in the village of St. Agatha in northern Wilmot Township, and is the source of Laurel Creek. It is one of a few meromictic lakes in Ontario, that is, its deep bottom waters (21 metres or 70 feet) are totally devoid of oxygen. The surface and bottom layers do not mix, and the lake is vulnerable to environmental damage.[2]
Restrictions on lake use include no motorized boats, no fertilizer or pesticide use, and regular septic tank inspections.
Sunfish Lake is often compared to Paradise Lake which is about 3 km to the north-west, in Wellesley Township. Paradise Lake is a much larger lake and accommodates many more properties with the ability to live year-round.
There are about 20 cottages and homes on the lake, of which only a small handful are zoned for year-round residence, the rest are zoned recreational and are not used nor lanes cleared during the winter.