Lake · St. Martin County · LA
Is Lake la Pointe safe to swim?
Blue-green algae is above the safe-contact threshold.
Updated July 20, 2026 · EPA CyAN satellite
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What's in the water at Lake la Pointe right now
As of July 20, 2026, Lake la Pointe in St. Martin County, Louisiana is not recommended for swimming. Satellite imagery measured 420,749 cells/mL of blue-green algae on July 19, 2026, above the 100,000 cells/mL advisory threshold. Rainfall over the past week totaled 3.4 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Lake la Pointe
Lake la Pointe is a lake in St. Martin County, Louisiana. Satellite imagery measured 420,749 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.
Bloom history at Lake la Pointe
From EPA CyAN's satellite archive
Over 7 summers of satellite monitoring since 2020, Lake la Pointe has reached blue-green algae advisory levels in 7 of them, most recently in June 2026. This is a lake that blooms most summers. Its highest recorded reading was 1,596,111 cells/mL in June 2026.
Frequently asked: swimming in Lake la Pointe
- Is it safe to swim in Lake la Pointe right now?
- Lake la Pointe is not recommended for swimming today. Satellite imagery measured 420,749 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 Lake la Pointe have blue-green algae (cyanobacteria)?
- Yes. Satellite monitoring measured 420,749 cells/mL of blue-green algae (cyanobacteria) at Lake la Pointe 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 Lake la Pointe?
- No. Blue-green algae at Lake la Pointe is above the safe-contact threshold (420,749 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 Lake la Pointe have blue-green algae blooms?
- Over 7 summers of satellite monitoring since 2020, Lake la Pointe has reached blue-green algae advisory levels in 7 of them, most recently in June 2026. This is a lake that blooms most summers. Its highest recorded reading was 1,596,111 cells/mL in June 2026.
- How many Louisiana lakes and beaches are unsafe for swimming today?
- Today, 69 Louisiana waters are above a safe-contact threshold and 36 more warrant caution, out of 265 monitored waters SwimZone tracks in the state.
- How is Lake la Pointe'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 Lake la Pointe, and a recent-rainfall overlay, all refreshed daily. It was last updated July 20, 2026.