Sydenham Lake
Frontenac, OntarioView mapDirections
Ontario MECP publishes the water-quality measurements for Sydenham Lake. Here is what has been measured.
Sydenham Lake in Frontenac, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 4.8 m visibility. Phosphorus: 12.3 µg/L.
Sydenham 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 2025-09-14. Methodology: how these readings are compared.
What Sydenham Lake is good for
From access and monitoring records, not editorial picks.
- Clear water15.7 ft of visibility
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Sydenham 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 Sydenham Lake
These are the measurements Ontario MECP publishes for Sydenham Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 15.7 ft down. Phosphorus 12.3 µg/L. TSI 39.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.8m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 12.3µg/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. | 39 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
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Frequently asked questions about Sydenham Lake
Where is Sydenham Lake?
- Sydenham 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 Sydenham Lake?
- Sydenham Lake in Frontenac, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 4.8 m visibility. Phosphorus: 12.3 µg/L.
Is Sydenham 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 Sydenham 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.