Beach · Galveston County · TX
Is O'Neil Rd. safe to swim?
Recent heavy rain may have spiked bacteria since the last clear sample.
Updated July 19, 2026 · Texas beach program (EPA BEACON)
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What's in the water at O'Neil Rd. right now
As of July 19, 2026, O'Neil Rd. in Galveston County, Texas carries a swim caution. Blue-green algae are not currently monitored at this water. No fecal-bacteria advisory is posted (state beach program). Rainfall over the past week totaled 8.3 in, which can wash bacteria and nutrients into the water.
Blue-green algae at O'Neil Rd.
O'Neil Rd. is a lake in Galveston County, Texas. Blue-green algae are not currently monitored at this water.
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.
Frequently asked: swimming in O'Neil Rd.
- Is it safe to swim in O'Neil Rd. right now?
- O'Neil Rd. carries a swim caution today. Blue-green algae are not currently monitored at this water. Conditions can change quickly with wind, heat, and rain, so check the posted signs and look at the water before you get in.
- Does O'Neil Rd. have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at O'Neil Rd.. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in O'Neil Rd.?
- No bloom is detected at O'Neil Rd. 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 many Texas lakes and beaches have swim advisories today?
- Today, 78 Texas waters are under a swim advisory and 86 more warrant caution, out of 399 monitored waters SwimZone tracks in the state.
- How is O'Neil Rd.'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 O'Neil Rd., and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.