Opinicon Lake
Frontenac, OntarioView mapDirections
Ontario MECP publishes the water-quality measurements for Opinicon Lake. Here is what has been measured.
Opinicon Lake in Frontenac, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 4 m visibility. Phosphorus: 13.6 µg/L.
Opinicon Lake is a lake in Frontenac County, Ontario.
Source: Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring) — not the EPA Water Quality Portal, last sampled 2025-10-12. Methodology: how these readings are compared.
What Opinicon Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13.1 ft of visibility
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Opinicon 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 Opinicon Lake
These are the measurements Ontario MECP publishes for Opinicon Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 13.1 ft. Phosphorus 13.6 µg/L. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 13.6µg/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. | 41 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Frequently asked questions about Opinicon Lake
Where is Opinicon Lake?
- Opinicon Lake is a lake in Frontenac, Ontario. Its water-quality measurements are published by Ontario MECP and shown on this page as reported.
What is the water quality of Opinicon Lake?
- Opinicon Lake in Frontenac, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 4 m visibility. Phosphorus: 13.6 µg/L.
Is Opinicon Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
Measurements for Opinicon 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.