Here are some links to regulators, industry professionals and organizations which can provide additional information.

Homeowner’s Septic System Guide from NOWRA
http://www.nowra.org/onsite_guide.html

EPA Homeowner's Guide to Septic Systems
http://www.epa.gov/owm/septic/pubs/homeowner_guide_long.pdf

Information for Septic System Owner’s – Good info from King County, WA
http://www.metrokc.gov/HEALTH/wastewater/owners/index.htm

Clark County Environmental Health Department
http://www.co.clark.wa.us/health/environmental/septic/index.html

Washington Department of Health
http://www.doh.wa.gov/ehp/ts/WW/default.htm

Washington State Department of Ecology
http://www.ecy.wa.gov/ecyhome.html

WOSSA – Washington Onsite Sewage Association
www.wossa.org

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

Big Jon Septic Service – Septic tank pumper in Clark County
www.bigjonseptic.com

ORENCO – Manufacture of high quality on-site wastewater products
www.orenco.com

GLENDON – Proprietor of the Glendon® Biofilter Technology
www.glendon.com