Ontario Lake
Prince Edward, OntarioView mapDirections
Ontario MECP publishes the water-quality measurements for Ontario Lake. Here is what has been measured.
Ontario Lake in Prince Edward, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 2.5 m visibility. Phosphorus: 14 µg/L.
Ontario Lake is a lake in Prince Edward County, Ontario.
Source: Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring) — not the EPA Water Quality Portal, last sampled 2025-10-17. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Ontario Lake is safe to swim in today is a call for the Ontario Ministry of the Environment, Conservation and Parks and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Ontario Lake
These are the measurements Ontario MECP publishes for Ontario Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 8.2 ft. Phosphorus 14 µg/L. TSI 44.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.5m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 14µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 44 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Ontario Lake
Answers come straight from the public measurements and survey records on this page.
Stays via Stay22
Stays near Ontario Lake
Compare lakeside cabins, hotels, and vacation rentals near Ontario Lake in Prince Edward, 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 Ontario Lake
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Ontario Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Ontario Lake
Nearby Lakes in Prince Edward
Frequently asked questions about Ontario Lake
Where is Ontario Lake?
- Ontario Lake is a lake in Prince Edward, Ontario. Its water-quality measurements are published by Ontario MECP and shown on this page as reported.
What is the water quality of Ontario Lake?
- Ontario Lake in Prince Edward, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 2.5 m visibility. Phosphorus: 14 µg/L.
Is Ontario Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Ontario Lake across LakeQuality
More lakes in Ontario
Other Lakes in Ontario
Mesotrophic Lakes in Ontario
Where this data comes from
Measurements for Ontario Lake come from Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring), not the EPA Water Quality Portal. Per-sample source details are not recorded for this lake. Contains information licensed under the Open Government Licence – Ontario. See data sources.