Is Long Pond safe to swim?

As of July 22, 2026, Long Pond in Monroe County, New York is not recommended for swimming. Satellite imagery measured 1,013,778 cells/mL of blue-green algae on July 21, 2026, above the 100,000 cells/mL advisory threshold. Rainfall over the past week totaled 2.8 in, which can wash bacteria and nutrients into the water.

How this read is built

Long Pond is a pond in Monroe County, New York covering about 0.8 sq mi, the 104th-largest of the 133 lakes SwimZone monitors in New York. Satellite imagery measured 1,013,778 cells/mL of blue-green algae on July 21, 2026, above the 100,000 cells/mL advisory threshold.

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, Long Pond has reached blue-green algae advisory levels in 7 of them, most recently in July 2026. This is a lake that blooms most summers. Its highest recorded reading was 1,839,344 cells/mL in September 2023.

Is it safe to swim in Long Pond right now?

Long Pond is not recommended for swimming today. Satellite imagery measured 1,013,778 cells/mL of blue-green algae on July 21, 2026, above the 100,000 cells/mL advisory threshold. Conditions can change quickly with wind, heat, and rain, so check the posted signs and look at the water before you get in.

Does Long Pond have blue-green algae (cyanobacteria)?

Yes. Satellite monitoring measured 1,013,778 cells/mL of blue-green algae (cyanobacteria) at Long Pond on July 21, 2026, above the 100,000 cells/mL advisory level. Avoid swimming and keep children and pets out of the water.

Can dogs swim in Long Pond?

No. Blue-green algae at Long Pond is above the safe-contact threshold (1,013,778 cells/mL on July 21, 2026). Cyanobacteria toxins can be rapidly fatal to dogs, which swallow it while swimming and lick it from their fur. Keep dogs out of the water and away from any scum along the shore.

How often does Long Pond have blue-green algae blooms?

Over 7 summers of satellite monitoring since 2020, Long Pond has reached blue-green algae advisory levels in 7 of them, most recently in July 2026. This is a lake that blooms most summers. Its highest recorded reading was 1,839,344 cells/mL in September 2023.

How many New York lakes and beaches are unsafe for swimming today?

Today, 12 New York waters are above a safe-contact threshold and 188 more warrant caution, out of 495 monitored waters SwimZone tracks in the state.

How is Long Pond'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 Long Pond, and a recent-rainfall overlay, all refreshed daily. It was last updated July 22, 2026.