Guides

• Where this data comes from, and its real limits — How PercCheck turns raw SSURGO soil data into one county rating - the area-weighting, the county-matching approximation, and what's left unrated.
• How a percolation test actually works — What happens at a real percolation test, who orders it, and why the county-level rating on this site can't replace one.
• Conventional vs. engineered septic systems — What separates a standard gravity septic system from a mound or aerobic-treatment system, what triggers needing one, and what each actually costs.
• Buying rural land? What to check before you rely on septic — A pre-purchase checklist for land with no sewer connection - what to verify before you're under contract, not after.
• Embed the PercCheck Septic Suitability Badge — A free, live septic-suitability badge for any of the 3144 counties this site covers - one iframe, no sign-up, credited back to PercCheck.