Three Mile Lake Association

09/28/2026

Water Quality Advisory: Blue-Green Algae | Three Mile Lake

Issued by the Simcoe Muskoka District Health Unit, when blue-green algae is present:
• Stay out of the water and keep pets away.
• Wash with soap and clean water right after exposure.
• Contact your healthcare provider if you develop symptoms after being in water with blue-green algae.
• Report suspect blooms to the Ministry of the Environment, Conservation and Parks (MECP). Incidents can be reported online or by phone at 416-325-3000 or toll-free: 1-800-268-6060.

If your private water supply may be affected by a bloom:
• Do not drink the water or use it for cooking or baby formula.
• Use bottled water or another safe source.
• Do not boil the water. Boiling does not remove toxins and can increase them.
• Avoid using chemicals like herbicides, copper sulphate, or algaecides which can release more toxins.

The advisory posted to muskokalakes.ca will be updated in accordance with information provided by the Simcoe Muskoka District Health Unit: https://www.muskokalakes.ca/news/posts/water-quality-advisory-blue-green-algae-bloom-three-mile-lake/

For current waterways affected by blue-green algae, visit: https://www.simcoemuskokahealth.org/Topics/SafeWater/bluegreenalgae.aspx

For more information, contact the Simcoe Muskoka District Health Unit at 705-721-7520 or toll-free at 1-877-721-7520. For after-hours public health emergencies, call 1-888-225-7851.

09/24/2026

Liz Favot remembers when she first saw the waters outside her cottage on Lake Nipissing, Ont., turn a murky green. It was in the summer of 2020. “This

08/31/2026

08/28/2026

That backyard mosquito fogging? It's killing more than mosquitoes.

Permethrin — the broad-spectrum insecticide used in property fogging services — kills every insect it touches: bees, dragonflies, monarch butterflies, cicadas. It passes into bird eggs, reducing fledgling survival. Concentrations cause brain damage in frogs and salamanders. On a moderately windy day, it can travel up to 120 metres from where it was sprayed.

MWC's Chris Brew explains what permethrin actually does to Muskoka's ecosystem — and the low-tech alternatives that actually work.

Read more:
🔗 linktr.ee/muskokawatershed

08/16/2026

Did you know the frequency and magnitude of blue-green algal blooms continue to rise across Canada and are expected to be further exacerbated by the impacts of climate change and traditional land use practices?

Read our blog post to discover:
➡what blue-green algae (cyanobacteria) is;
➡the impacts of algal blooms and how you can help limit them;
➡the role of climate change and invasive species; and
➡how to take action.

https://watersheds.ca/why-is-blue-green-algae-cyanobacteria-becoming-more-prominent/

07/27/2026

A team of Three Mile Lake Association volunteers built and launched a Floating Treatment Wetland pilot yesterday. Two FTW prototypes were placed in the Six Mile creek, at the East end of the lake. The plant roots absorb phosphorous and can help reduce blue green algae.

07/26/2026

Members and Volunteers of the TMLA building the Floating Treatment Wetland prototype.

07/25/2026

TMLA volunteers were out on Three Mile Lake sampling offshore and nearshore sites for the Muskoka Watershed Council Algae Monitoring program.

07/23/2026

A few years ago, the Muskoka Conservancy purchased 150 acres of upland forest and wetland ecosystems to provide habitats for various species at risk and also to protect headwaters for Three Mile Lake.

We did a site monitoring visit there today (there is no trail and it is not open to the public). We had to bushwack 40 minutes off Stevenson Rd 2 to access the boundary for the Source of Three Mile Lake Nature Reserve.