Decker Lake borders the I-215 Belt Route in West Valley City at approximately 2700 South. DEQ’s recreational water quality monitoring checks for Harmful Algal Blooms (HABs). Find the most recent Decker Lake monitoring information below.
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Updates
December 16, 2025: Recreational water quality monitoring update
Recreational water quality monitoring has ended for the season. Harmful algal blooms can occur year round. Know what to look for and always check before recreating.
August 22, 2025: Harmful algal bloom (HAB) monitoring update
BE CAREFUL: A harmful algal bloom is present at Decker Lake. Algae in the water may be producing dangerous toxins that can make humans and animals sick.
Salt Lake County Health Department has issued a WARNING ADVISORY.
If you visit the lake:
- Do not swim or water ski
- 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