The District released a report on 2025 water quality metrics
A new report on Muskoka’s lake water quality shows phosphorus levels remain below the threshold linked to algae blooms, but calcium is declining and chloride from road salt continues to rise.
The District of Muskoka’s 2025 monitoring found 31 per cent of sampled sites had calcium levels high enough to threaten sensitive aquatic life. Meanwhile, 28 per cent had chloride levels above 10 milligrams per litre.
The District says protecting natural shorelines and reducing road salt use can help protect lake health.
Results from the 2026 sampling season are expected to be released next year.

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