Lake · Box Elder County · UT
Is Hull Lake safe to swim?
No advisory or algae bloom reported for this water today.
Updated July 20, 2026 · EPA CyAN satellite
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What's in the water at Hull Lake right now
As of July 20, 2026, Hull Lake in Box Elder County, Utah is clear to swim. Satellite imagery detected no blue-green algae bloom as of July 19, 2026. Rainfall over the past week totaled 0.0 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Hull Lake
Hull Lake is a lake in Box Elder County, Utah covering about 1.1 sq mi, the 22nd-largest of the 48 lakes SwimZone monitors in Utah. Satellite imagery detected no blue-green algae bloom as of July 19, 2026.
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 Hull Lake
From EPA CyAN's satellite archive
Over 7 summers of satellite monitoring since 2020, Hull Lake has reached blue-green algae advisory levels in 3 of them, most recently in June 2026. Its highest recorded reading was 2,180,635 cells/mL in June 2026.
Frequently asked: swimming in Hull Lake
- Is it safe to swim in Hull Lake right now?
- Hull Lake is clear to swim today. Satellite imagery detected no blue-green algae bloom as of July 19, 2026. Conditions can change quickly with wind, heat, and rain, so check the posted signs and look at the water before you get in.
- Does Hull Lake have blue-green algae (cyanobacteria)?
- No blue-green algae bloom is detectable at Hull Lake as of July 19, 2026 (below the satellite's roughly 10,000 cells/mL detection limit). Cyanobacteria can still appear within hours in warm, calm, nutrient-rich water, so look before you swim.
- Can dogs swim in Hull Lake?
- No bloom is detected at Hull Lake 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 often does Hull Lake have blue-green algae blooms?
- Over 7 summers of satellite monitoring since 2020, Hull Lake has reached blue-green algae advisory levels in 3 of them, most recently in June 2026. Its highest recorded reading was 2,180,635 cells/mL in June 2026.
- How many Utah lakes and beaches are unsafe for swimming today?
- Today, 7 Utah waters are above a safe-contact threshold and 0 more warrant caution, out of 53 monitored waters SwimZone tracks in the state.
- How is Hull Lake'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 Hull Lake, and a recent-rainfall overlay, all refreshed daily. It was last updated July 20, 2026.