Beach · Marin County · CA
Is Heart's Desire - HEARTS DESIRE safe to swim?
No advisory or algae bloom reported for this water today.
Updated July 19, 2026 · California beach program (EPA BEACON)
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Know before you get in at Heart's Desire - HEARTS DESIRE.
Get an alert the day a bacteria or algae advisory goes up.
What's in the water at Heart's Desire - HEARTS DESIRE right now
As of July 19, 2026, Heart's Desire - HEARTS DESIRE in Marin County, California is clear to swim. 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 0.0 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Heart's Desire - HEARTS DESIRE
Heart's Desire - HEARTS DESIRE is a lake in Marin County, California. 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 Heart's Desire - HEARTS DESIRE
- Is it safe to swim in Heart's Desire - HEARTS DESIRE right now?
- Heart's Desire - HEARTS DESIRE is clear to swim 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 Heart's Desire - HEARTS DESIRE have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at Heart's Desire - HEARTS DESIRE. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in Heart's Desire - HEARTS DESIRE?
- No bloom is detected at Heart's Desire - HEARTS DESIRE 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 California lakes and beaches have swim advisories today?
- Today, 28 California waters are under a swim advisory and 4 more warrant caution, out of 452 monitored waters SwimZone tracks in the state.
- How is Heart's Desire - HEARTS DESIRE'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 Heart's Desire - HEARTS DESIRE, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.