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Single-Family Weight Study

Partner: City of Portland Bureau of Planning and Sustainability, Metro

Start Date: 1992

Duration: Current

The Single-Family Weight Study (SFW), formerly the Can Weight Study (CWS), collects single-family residential waste data from curbside rollcarts.  This information is utilized by the City of Portland to help set residential waste hauling fees and establish waste reduction, recycling and diversion goals. Project staff weigh garbage, recycling and compost roll-carts; collecting weights from 1200 single-family residential homes during four 10-week periods a year. Data provided by CES helps the city to calculate the market rates for both franchised haulers and residents balanced by the cost of disposal.

More recently, the City of Portland added a Compost Pilot study to the SFW. Data collected as part of the Compost Pilot study will be utilized by Portland Bureau of Planning and Sustainability (BPS) to evaluate compost waste diversion in the early adopter neighborhoods and will aid in the residential rate making process.



  • Since 1992 the CWS has collected rollcart weights from an estimated 22,800 homes throughout the Portland Metro Region;
  • Each home is visited 4 times for an estimated 90,000 total visits; and
  • Data collection routes average 1.35 miles in length. Field staff have cumulatively walked and collected data approximately 1,000 miles.

City of Portland Recycle At Home website

To learn more about the Can Weight Study Contact CES.