| state.or.us | Oregon Commercial Waste Reduction Clearinghouse |
| ca.gov | Local Government Central |
| p2ric.org | Pollution Prevention Regional Information Center |
| fau.edu | Pollution Prevention Coalition |
| environmental-center.com | Indicators of Pollution Management |
| gc.ca | Canadian Pollution Prevention Information Clearinghouse |
| defra.gov.uk | UK DEFRA Pollution Prevention and Control |
| cleanup.org | Earth 911 |
| angelfire.com | The Search for Safer and Greener Chemical Solvents in Surface Cleaning |
| state.pa.us | Pennsylvania Department of Transportation Recycling Page |
United States , Washington , Maple Valley