North Muldrew Lake
Muskoka District, OntarioView mapDirections
Ontario MECP publishes the water-quality measurements for North Muldrew Lake. Here is what has been measured.
North Muldrew Lake in Muskoka District, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 3 m visibility. Phosphorus: 8.9 µg/L.
North Muldrew Lake is a lake in Muskoka District County, Ontario.
Source: Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring) — not the EPA Water Quality Portal, last sampled 2025-10-05. Methodology: how these readings are compared.
What North Muldrew Lake is good for
From access and monitoring records, not editorial picks.
- Clear water9.8 ft of visibility
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether North Muldrew 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 North Muldrew Lake
These are the measurements Ontario MECP publishes for North Muldrew 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 9.8 ft. Phosphorus 8.9 µg/L. TSI 40.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 8.9µg/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. | 40 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
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Frequently asked questions about North Muldrew Lake
Where is North Muldrew Lake?
- North Muldrew Lake is a lake in Muskoka District, Ontario. Its water-quality measurements are published by Ontario MECP and shown on this page as reported.
What is the water quality of North Muldrew Lake?
- North Muldrew Lake in Muskoka District, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 3 m visibility. Phosphorus: 8.9 µg/L.
Is North Muldrew 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 North Muldrew 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.