Upgrades in 1997 included the addition of two automatic, self-cleaning fine screens designed to remove large and small non-biodegradable debris from the wastewater flow. The screenings collected by the fine screens are placed in a waste roll-off container before being hauled to a landfill for disposal.

In 1997, one 20-foot diameter, cyclone grit separator was installed to remove sand and silt from the influent wastewater. Sand and silt enters the waste stream with the inflow/infiltration of rainwater and clear-water into the sanitary sewer collection system. The grit is washed to remove organic matter and then deposited in the waste roll-off with the screenings collected by the fine screens. In 2002 about 170 cubic yards of grit and screenings was removed from the wastewater.

Four primary clarifiers (90 ft. x 90 ft.) provide 5.67 hours detention at 12.0 million gallons per day (MGD) average daily flow. Heavy organic solids settle out by gravity. The settled primary sludge solids are pumped to the anaerobic digestion process for further treatment before disposal.