SepticTankHub Research
Original data on America's septic systems
We maintain the largest directory of septic companies in the country — and we turn that position into public data: national statistics, cost indexes, regulation databases, and annual surveys of the pros who pump America's tanks. Everything here is free to cite with attribution.
Septic System Statistics
The citation source for every septic number: households on septic, companies by state, new-construction share, and the truth behind the 21-million figure.
Explore →Septic Cost Index by State
Official septic permit fees across the states, from published government fee schedules, plus local provider counts for all 51.
Explore →Septic Tank Size Calculator
Bedroom- and code-based tank sizing with state minimums. Free to embed.
Explore →The Cost of Septic Neglect
The maintenance multiplier: skipping a $400–$750 pump-out risks a $5,000–$20,000 drain-field replacement.
Explore →Septic Inspection at Home Sale
The 50-state guide to which states legally require a septic inspection when you sell a home. Only 3 blanket-require it.
Explore →Septic Regulations by State
Permit fees, point-of-sale inspection rules, and a full regulations guide for every state — in one reference.
Explore →Septic Soil Suitability by State
USDA soil data: 73% of rated US soils are poorly suited for a conventional septic drain field. Worst is Maine at 96%.
Explore →U.S. Septic Failure Risk Index
2,390 counties scored on USDA soil suitability and Census housing age. Riskiest: Pawnee County, Nebraska.
Explore →The Septic Capitals of America
Density rankings: the states, metros, and counties that rely on septic the most.
Coming September 2026Our data standards
Media inquiries: [email protected] · Data questions & licensing: [email protected] · See also our press page and verification methodology.
