Leeds and Grenville Counties County, Ontario · Water Quality Report Card
Temperance Lake
Temperance Lake in Leeds and Grenville Counties, Ontario received a water quality grade of B (Good). Water clarity: 1.8 m visibility. Phosphorus: 17.9 µg/L.
- Clarity
- 1.8 m
- Type
- Mesotrophic
Temperance Lake is a mesotrophic lake in Leeds and Grenville Counties County, Ontario. Water quality is graded B based on 2 sampling years through 2025. Compared to the 33 other monitored lakes in Leeds and Grenville Counties County, Temperance Lake ranks #31 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-10-14. Grade methodology: LakeGrade methodology.
Watch Temperance Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 5.9 ft. Phosphorus level: 17.9 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 m | D |
| Phosphorus | 17.9 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Temperance Lake
Compare lakeside cabins, hotels, and vacation rentals near Temperance Lake in Leeds and Grenville Counties, Ontario — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Temperance Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Temperance Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Temperance Lake — straight to your inbox. No spam, unsubscribe anytime.
Fishing Temperance Lake
Location
County Ranking
Ranked #31 of 34 lakes in Leeds and Grenville Counties
Cleaner Lakes Within 30 Miles
Temperance Lake holds Grade B. 5 nearby lakes hold higher grades.
- ACharleston LakeLeeds and Grenville Counties · 8 mi · Higher grade (B → A)
- ABass LakeLeeds and Grenville Counties · 9.6 mi · Higher grade (B → A)
- AHigley LakeLeeds and Grenville Counties · 10.6 mi · Higher grade (B → A)
- ARed Horse LakeLeeds and Grenville Counties · 10.7 mi · Higher grade (B → A)
- BGraham LakeLeeds and Grenville Counties · 1.4 mi · Higher overall water quality score
Nearby Lakes in Leeds and Grenville Counties
Explore Temperance Lake across LakeGrade
More Ontario Lake Rankings
Other Grade B Lakes in Ontario
Mesotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Temperance Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2025-10-14
Monitoring stations: