Georgian Bay, Ontario

This profile covers the Township of Georgian Bay in Muskoka, rather than treating the whole Georgian Bay shoreline as one water system. Municipal service in MacTier and Port Severn is operated by the District of Muskoka, while other properties require confirmation of their own supply. A nearby bay, lake, island or township…

Water at a glance

Reported system values · sampling scope shown below
Parameter	Local summary	Reference / interpretation
Chlorine — MacTier	1.17–2.14 mg/L	Operational disinfectant measure; see system report
Chlorine — Port Severn	1.25–2.38 mg/L	Operational disinfectant measure; see system report
Turbidity — Port Severn	0.05–0.9 NTU	Treatment-performance measure; see system report

System measurements are not household tap readings. A blank or unlisted value is not a zero result.

Open official water report / source →

Water source & treatment

Muskoka's 2025 reports identify Stewart Lake as MacTier's raw-water source and Little Lake as Port Severn's. Both plants describe coagulation and flocculation, settling, filtration, chlorine disinfection, fluoridation and final pH adjustment. Their monitoring figures belong to two separate treatment systems. The values below therefore name the plant instead of offering one invented Georgian Bay average; wider-shoreline municipalities should be researched through their own utility reports.

What this means for your home

Confirm municipal connection versus private supply, then plan treatment for the actual household or cottage. For private wells, the Township directs owners to regular bacterial sampling and public-health interpretation. For a private surface-water intake, assess water quality and the existing treatment train directly. Include seasonal shutdown, freeze protection, reliable power, sediment loading, peak flow and maintenance access in a cottage design discussion; municipal plant data does not establish performance at an island intake.

Profile scope

Township of Georgian Bay in Muskoka, especially MacTier and Port Severn; not every municipality around the wider bay.

Sampling context

Chlorine — MacTier: 1.17–2.14 mg/L. MacTier 2025 operational-monitoring range; report lists geometric mean 1.67 mg/L. Not all Georgian Bay supplies. Source report
Chlorine — Port Severn: 1.25–2.38 mg/L. Port Severn 2025 operational-monitoring range; report lists geometric mean 1.91 mg/L. Separate from MacTier. Source report
Turbidity — Port Severn: 0.05–0.9 NTU. Port Severn 2025 operational-monitoring range; report lists geometric mean 0.12 NTU. Source report

Official sources

Photograph credit

Port Severn, Georgian Bay Township, Ontario. P199 · Wikimedia Commons. Public domain. Resized and converted to WebP; may be displayed cropped.