State associations
- Washington Association of Building Officials (WABO)
- Land Surveyors Association of Washington (LSAW)
- Washington On-Site Sewage Association
- Wastewater Management Program, Washington State Department of Health
National organizations
Engineers and land surveyors
- National Council of Examiners for Engineering and Surveying (NCEES)
- National Society of Professional Engineers (NSPE)
- National Society of Professional Surveyors (NSPS)
- American Society of Civil Engineers (ASCE)
- American Institute of Chemical Engineers (AICHE)
- American Society of Mechanical Engineers (ASME)
- Institute of Electrical and Electronics Engineers (IEEE)
- Institute of Industrial Engineers (IIE)
- Institute of Transportation Engineers (ITE)