Clark County Environmental Health Department
http://www.clark.wa.gov/public-health/septic/index.html

Washington Department of Health – Septic Systems
http://www.doh.wa.gov/CommunityandEnvironment/WastewaterManagement/SepticSystem

Septics 101 Chapter 1: Introduction and Sewage Overview
https://www.youtube.com/watch?v=U5-NUYcWXGg&t=4s

Septics 101 Chapter 2: System Basics and Soil
https://www.youtube.com/watch?v=olNAI0gmCos

Septics 101 Chapter 3: Types of Septic Systems
https://www.youtube.com/watch?v=3ZANsnpx3tg

Septics 101 Chapter 4: System Care and Maintenance
https://www.youtube.com/watch?v=fVSHhZmU12E

Septics 101 Chapter 5: System Inspections
https://www.youtube.com/watch?v=d3WFV2pJvHU

Septics 201: DIY Septic System Inspection
https://www.youtube.com/watch?v=jmBqNABTuPE

Septic Systems Overview – soils, design, installation, do’s/don’t, inspections, etc
https://www.youtube.com/watch?v=QT1Pfb1Tr7U

Homeowner’s Septic System Guide from NOWRA
http://www.nowra.org/files/Homeowner%20Onsite%20Systems%20folder.pdf

EPA Homeowner's Guide to Septic Systems (short version)
https://www3.epa.gov/npdes/pubs/homeowner_guide_short.pdf

EPA Homeowner's Guide to Septic Systems (long version)
https://www3.epa.gov/npdes/pubs/homeowner_guide_long.pdf

WOSSA – Washington Onsite Sewage Association
www.wossa.org

NOWRA – National Onsite Wastewater Recycling Association
www.nowra.org

Very knowledgeable engineers. I saved a ton of money and got a better system than what was previously recommended. Courteous folks to work with from the first phone call until completion. True professionals. Very highly recommended.
Geary Ferguson