Health Watch
Harmful Algae Present
- Do not swim or water ski in areas of algae
- Avoid areas of algae when boating
- Keep animals away
- Do not drink the water
- Clean fish well and discard guts
Gunlock Reservoir is located approximately 15 miles northwest of St. George. DEQ’s recreational water quality monitoring checks for two health concerns: Harmful Algal Blooms (HABs) and Waterborne Pathogens (E. coli). Find the most recent monitoring information below.
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Updates
May 13, 2025: Harmful algal bloom (HAB) monitoring update
Be Careful: Local officials have observed visible signs of a harmful algal bloom at Gunlock Reservoir. There could be algae in the water producing dangerous toxins.
We recommend:
- Do not swim or water ski in areas of algae
- Avoid areas of algae when boating
- Clean fish well and discard skin and guts
- Keep animals away
- Don’t drink the water
- Know how to recognize a harmful algal bloom
