Here is an excellent website that explains Type 1, drug 2 & 3 septic systems the Septic Expert.
Frequently ask Questions for Type II & III Systems Capital Regional District Onsite Sewage System Maintenance Bylaw.
Another link providing more information on ground and surface water contamination is http://all-about-water-filters.com/water-contamination/. This is a company that sells water filtration devices but the information they provide on both contamination and filtration make for more interesting reading on this most important subject of providing a safe and clean water option for your home and family. I believe these “point of entry” systems are the future for individual small rural homes and communities.
Multi million dollar centralized filtration and sewage plants are neither practical nor affordable for these small rural applications.