The variety of habitat at the Wastewater System includes over 1,000 acres of even-aged conifer and dryland white and black oak woodlots; over 5,000 acres of alfalfa, corn, and soybean cropland; 20 miles of drainage ditches, 60 acres of treatment ponds, 11 miles of shoreline around 1,700 acres of storage lagoons; a few hundred acres of natural upland grasslands; and assorted wetland marshes and potholes. Because of this, the 11,000-acre treatment plant is considered one of the best birding sites in Michigan. At least 256 species of birds have been documented at the facility (two-thirds of all species ever recorded in Michigan). Possibly the rarest bird ever documented in the state was seen here in April of 1985, a White Wagtail.

Tens of thousands of geese and ducks spend part of the winter at the site, sharing the area with Bald Eagles, Peregrine Falcons, Snowy Owls, Snow Buntings, plovers, sandpipers, and dozens of other bird species. At other times of the year, birders might see Red Phalarope, Greater White-fronted Goose, Eurasian Wigeon, Gyrfalcon, Eared Grebe, or American White Pelican.

The Muskegon facility is located adjacent to the Muskegon State Game Area, which helps draw birds to the wastewater system. Birders are welcome at the facility provided they obtain a pass at the wastewater system office before touring the site. Birders that can show membership in a birding organization can be issued annual passes.