Gresham Wastewater Treatment Plant

treatment plant and solar array aerial viewGresham’s Wastewater Treatment Plant (WWTP) takes dirty water from bathrooms, kitchens, laundries and businesses, cleans it, and returns it to the natural water cycle via the Columbia River.

  • The treatment plant treats an average 13 million gallons of wastewater daily.
  • The treatment plant serves 108,000 customers and treats wastewater from the cities of Gresham, Fairview and Wood Village.
  • Nearly 300 miles of sewer lines in Gresham carry wastewater to the treatment plant from homes, businesses and institutions.
  • The WWTP recycles its leftover sludge, or biosolids, for reuse as a crop nutrient and soil conditioner on agricultural land for harvests not for human consumption.

To help reduce the volume of water sent to the wastewater treatment plant, consider reducing the amount of water you use.

WWTP Goes Green, Saves Money and the Environment

The City has an ambitious goal to make its wastewater treatment plant energy independent by 2014, by producing its electrical power onsite through a combination of cogeneration and solar power.  This video shows what City staff have accomplished so far and what remains to be done.

Solar Power

The Wastewater Treatment Plant added solar power at the facility in 2010.

Turning Byproduct Gas Into Electrical Power

The WWTP’s Caterpillar lean-burn engine and generator takes methane gas produced from the plant’s digesters and turns it into electrical power and heat used at the facility. This reduces the City’s annual electricity costs by $260,000, an average of $21,600 savings a month.

  • League of Oregon Cities 2006 Award of Excellence
  • American Public Works Association 2006 Julian Award for Sustainability (Oregon)

Running on Renewable Energy

The WWTP produces 50% of its energy by converting methane gas into energy. The WWTP also purchases 18% of its electricity as renewable energy from wind farms in Oregon through PGE’s Clean Wind Program. With the addition of 7% solar power, the treatment plant is 75% sustainable.

Tour the WWTP

The public and school groups may tour the WWTP at 20015 NE Sandy Blvd. Call 503-618-3450 to schedule a tour.