Is Canada Falls Lake safe to swim?

As of July 23, 2026, Canada Falls Lake in Somerset County, Maine is clear to swim. Satellite imagery detected no blue-green algae bloom as of July 21, 2026. Rainfall over the past week totaled 1.1 in, which can wash bacteria and nutrients into the water.

How this read is built

Canada Falls Lake is a lake in Somerset County, Maine covering about 3.6 sq mi, the 65th-largest of the 319 lakes SwimZone monitors in Maine. Satellite imagery detected no blue-green algae bloom as of July 21, 2026.

Blue-green algae (cyanobacteria) blooms are most common from midsummer into early fall, when the water is warm, calm, and rich in nutrients from runoff. They can produce toxins that make people sick and can be rapidly fatal to dogs, so skip water that looks green, scummy, or like spilled paint, and keep children and pets out of it.

Over 7 summers of satellite monitoring since 2020, Canada Falls Lake has reached blue-green algae advisory levels in 2 of them, most recently in August 2024. Blooms here have been occasional rather than annual. Its highest recorded reading was 527,938 cells/mL in July 2020.

It is currently peak season for blue-green algae, when warm, calm water lets blooms form fastest. This lake has bloomed in 2 of 7 monitored summers, historically peaking around July. Early summer, before the water fully warms, has generally been the safer window here; check the current read before you go either way.

Is it safe to swim in Canada Falls Lake right now?

Canada Falls Lake is clear to swim today. Satellite imagery detected no blue-green algae bloom as of July 21, 2026. Conditions can change quickly with wind, heat, and rain, so check the posted signs and look at the water before you get in.

Does Canada Falls Lake have blue-green algae (cyanobacteria)?

No blue-green algae bloom is detectable at Canada Falls Lake as of July 21, 2026 (below the satellite's roughly 10,000 cells/mL detection limit). Cyanobacteria can still appear within hours in warm, calm, nutrient-rich water, so look before you swim.

Can dogs swim in Canada Falls Lake?

No bloom is detected at Canada Falls Lake today, but dogs are much more vulnerable to blue-green algae than people, and blooms can form within hours. Always keep dogs away from water that looks green, scummy, or discolored, and rinse them off after swimming.

How often does Canada Falls Lake have blue-green algae blooms?

Over 7 summers of satellite monitoring since 2020, Canada Falls Lake has reached blue-green algae advisory levels in 2 of them, most recently in August 2024. Blooms here have been occasional rather than annual. Its highest recorded reading was 527,938 cells/mL in July 2020.

How many Maine lakes and beaches are unsafe for swimming today?

Today, 15 Maine waters are above a safe-contact threshold and 41 more warrant caution, out of 457 monitored waters SwimZone tracks in the state.

How is Canada Falls Lake's water quality measured?

SwimZone builds this read from EPA CyAN satellite imagery for blue-green algae, official beach and fecal-bacteria advisories where a program monitors Canada Falls Lake, and a recent-rainfall overlay, all refreshed daily. It was last updated July 23, 2026.

• Blue-green algae and dogs→
• What does blue-green algae look like?→
• When is algae season?→