Is Watson Prairie safe to swim?

As of July 20, 2026, Watson Prairie in Alachua County, Florida is not recommended for swimming. Satellite imagery measured 957,862 cells/mL of blue-green algae on July 19, 2026, above the 100,000 cells/mL advisory threshold. Rainfall over the past week totaled 0.6 in, which can wash bacteria and nutrients into the water.

How this read is built

Watson Prairie is a lake in Alachua County, Florida covering about 0.6 sq mi, the 180th-largest of the 230 lakes SwimZone monitors in Florida. Satellite imagery measured 957,862 cells/mL of blue-green algae on July 19, 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, Watson Prairie 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 1,737,893 cells/mL in June 2022.

Is it safe to swim in Watson Prairie right now?

Watson Prairie is not recommended for swimming today. Satellite imagery measured 957,862 cells/mL of blue-green algae on July 19, 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 Watson Prairie have blue-green algae (cyanobacteria)?

Yes. Satellite monitoring measured 957,862 cells/mL of blue-green algae (cyanobacteria) at Watson Prairie on July 19, 2026, above the 100,000 cells/mL advisory level. Avoid swimming and keep children and pets out of the water.

Can dogs swim in Watson Prairie?

No. Blue-green algae at Watson Prairie is above the safe-contact threshold (957,862 cells/mL on July 19, 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 Watson Prairie have blue-green algae blooms?

Over 7 summers of satellite monitoring since 2020, Watson Prairie 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 1,737,893 cells/mL in June 2022.

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

Today, 97 Florida waters are above a safe-contact threshold and 350 more warrant caution, out of 779 monitored waters SwimZone tracks in the state.

How is Watson Prairie'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 Watson Prairie, and a recent-rainfall overlay, all refreshed daily. It was last updated July 20, 2026.