Water Quality Bugs 2025-2026

Class 1 - Pollution Sensitive

Mayfly (adult)

Class 1 - Pollution Sensitive

Mayfly (immature)

Class 1 - Pollution Sensitive

Caddisfly (adult)

Class 1 - Pollution Sensitive

Caddisfly (immature)

Class 1 - Pollution Sensitive

Stonefly (adult)

Class 1 - Pollution Sensitive

Stonefly (immature)

Class 1 - Pollution Sensitive

Dobsonfly (adult)

Class 1 - Pollution Sensitive

Dobsonfly (immature)

Class 1 - Pollution Sensitive

Gilled Snail (adult)

Class 1 - Pollution Sensitive

Gilled Snail (immature)

Not on Quizlet

Class 1 - Pollution Sensitive

Water Penny (adult)

Class 1 - Pollution Sensitive

Water Penny (immature)

Class 1 - Pollution Sensitive

Riffle Beetle (adult)

Class 1 - Pollution Sensitive

Riffle Beetle (immature)

Class 1 - Pollution Sensitive

Water Scorpion (adult)

Class 1 - Pollution Sensitive

Water Scorpion (immature)

Class 2 - Moderately Sensitive

Aquatic Sowbug (adult)

Class 2 - Moderately Sensitive

Aquatic Sowbug (immature)

Class 2 - Moderately Sensitive

damselflies (adult)

Class 2 - Moderately Sensitive

damselflies (immature)

Class 2 - Moderately Sensitive

Dragonfly (adult)

Class 2 - Moderately Sensitive

Dragonfly (immature)

Class 2 - Moderately Sensitive

Scuds (adult)

Class 2 - Moderately Sensitive

Scuds (immature)

Class 2 - Moderately Sensitive

Crane Fly (adult)

Class 2 - Moderately Sensitive

Crane Fly (immature)

Class 3 - Moderately Tolerant

Class 3 - Moderately Tolerant

Water Mite (adult)

Class 3 - Moderately Tolerant

Water Mite (immature)

Class 3 - Moderately Tolerant

Midge (adult)

Class 3 - Moderately Tolerant

Midge (immature)

Class 3 - Moderately Tolerant

Blackfly (adult)

Class 3 - Moderately Tolerant

Blackfly (immature)

Class 3 - Moderately Tolerant

Flatworm (adult)

Class 3 - Moderately Tolerant

Flatworm (immature)

Not on Quizlet

Class 3 - Moderately Tolerant

Leeches (adult)

Class 3 - Moderately Tolerant

Leeches (immature)

Class 4 - Pollution Tolerant

Air Breathing Snail (adult)

Class 4 - Pollution Tolerant

Air Breathing Snail (immature)

Class 4 - Pollution Tolerant

Deer/Horse Fly (adult)

Class 4 - Pollution Tolerant

Deer/Horse Fly (immature)

Class 4 - Pollution Tolerant

Tubifex (adult)

Class 4 - Pollution Tolerant

Tubifex (immature)

Class 4 - Pollution Tolerant

Blood Midge (adult)

Class 4 - Pollution Tolerant

Blood Midge (immature)

Class 5 - Air Breathing

Whirligig Beetle (adult)

Class 5 - Air Breathing

Whirligig Beetle (immature)

Class 5 - Air Breathing

Water Strider (adult)

Class 5 - Air Breathing

Water Strider (immature)

Class 5 - Air Breathing

Mosquito (adult)

Class 5 - Air Breathing

Mosquito (immature)

Class 5 - Air Breathing

Giant Water Bug (adult)

Class 5 - Air Breathing

Giant Water Bug (immature)

Class 5 - Air Breathing

Back Swimmer (adult)

Class 5 - Air Breathing

Back Swimmer (immature)

Class 5 - Air Breathing

Water Boatman (adult)

Class 5 - Air Breathing

Water Boatman (immature)

Class 5 - Air Breathing

Predacious Diving Beetle (adult)

Class 5 - Air Breathing

Predacious Diving Beetle (immature)

Aquatic Nuisance Plants

Purple Loosestrife

Aquatic Nuisance Plants

Eurasian Water Milfoil

Aquatic Nuisance Plants

Water Hyacinth

Aquatic Nuisance Animals

Zebra Mussel

Aquatic Nuisance Animals

Spiny Water Flea

Aquatic Nuisance Animals

Asian Tiger Mosquito

Aquatic Nuisance Animals

Asian Carp

Aquatic Nuisance Animals

Crayfish/Crawdads