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Home My WebLink AboutDWQ-2025-005082There are 2 types of harmful algae growth in Utah water bodies Underwateraccumulation Harmful algae mats can be found growing on submerged rocks, plants, and sand or as floating mats in lakes, reservoirs, and rivers. Dried mats on shoreline Feathery or mucous-like Thick scum floating on water Harmful algae mats HABs form green or blue-green water or scum in lakes, reservoirs, and rivers. Blue-greenwater Spilled paint Harmful algal blooms (HABs) TYPE 1 TYPE 2 Grass clippings or fuzzy nodules Blue-greenresidue on shore Green floatingglobules Floating greenscum Blue-green growth onground or in shallow water Check waterconditions HABs.utah.gov OK OKOK OK Harmless aquatic plants Not everything green is harmful algae. Some non-toxic aquatic vegetation is often confused with harmful algae. Don’t be fooled! See something like this? Use a green stick to lift up a piece of the material. If it has a fibrous, hair-like texture (as photographed), what you’re seeing is likely harmless filamentous green algae. Safe: filamentous green algae This aquatic plant can float in large masses on the water. Take a close look. If you can see small roots or leaves you know that the growth is harmless duckweed. Safe: duckweed 9 Check waterconditions HABs.utah.gov