# Tennessee Septic Regulations for Homeowners | 615 Septic Tank Pumping > Tennessee septic regulations explained for Nashville homeowners — tank sizing, installer licensing, hauler permits and what the county enforces. 2026 guidance. URL: https://615septictankpumping.com/guide/tennessee-septic-regulations-homeowners/ --- Rules & Permits # What Do Tennessee Septic Regulations Require of Homeowners? The parts of Chapter 0400-48-01 that actually affect a homeowner, in plain terms, with the rule numbers so you can check them. Published 2026-08-16 · Last updated 2026-08-16 · By 615 Septic Tank Pumping The short answer Tennessee regulates septic systems under Chapter 0400-48-01. Homeowners need a construction permit for any new system, repair or replacement; installers and septage haulers must hold TDEC permits; and tanks are sized by bedroom count with 750 gallons as the practical floor. Routine pumping needs no homeowner permit. ## The framework in one paragraph Subsurface sewage disposal in Tennessee is governed by Chapter 0400-48-01 of the state’s rules, administered by TDEC’s Division of Water Resources and delivered through county environmental health offices. It covers system design, tank capacity and construction, disposal field design, installer licensing, and permits for pumping contractors. Davidson County is one of the contract counties, which can mean an additional county permit alongside the state process. ## Tank capacity and construction Tanks are sized against the dwelling’s design flow, which follows bedroom count. The Tennessee Private Sewage Disposal Code sets minimum liquid capacity in its sizing table, with 750 gallons as the practical floor for the smallest dwellings; 1,000 to 1,500 gallons covers the great majority of single-family homes in Davidson County. Rule 0400-48-01-.09 governs tank design and construction, including a requirement that cast-in-place concrete tanks over 1,000 gallons have minimum top and bottom thicknesses of six inches. Rule 0400-48-01-.08 covers capacity; Rule 0400-48-01-.07 covers the conventional disposal field. The practical relevance for a homeowner is the bedroom count. Adding a bedroom to a house served by a system permitted for fewer is both an engineering problem and a permit problem. ## Who is allowed to do what Installation and repair: a licensed subsurface sewage disposal system installer. Not a general contractor, not a plumber without the endorsement, and not the homeowner. TDEC or the local inspector signs off before backfill. Pumping and hauling: a Septic Tank Pumping Contractor permit, issued by TDEC, is required for removing and disposing of domestic septage from septic tanks, holding tanks, portable toilets and similar facilities. Applications go on form CN-0765 to the Division of Fiscal Services. Vehicle marking: every vehicle engaged in domestic septage removal must carry the firm or operator name and address plus the removal permit number in bold lettering at least two inches high on a contrasting background, and display a department-issued identifying sticker. That last requirement is the homeowner’s verification tool. It is visible from the driveway. ## Permits, and how long they take Any new system, or a repair to a faulty existing one, needs a septic system construction permit from the county environmental health office before work starts. The application covers site details, occupancy, bedroom count, water use, basement plumbing, and the installer’s name, plus a site sketch showing property lines, house, well, spring, driveway and utilities. Review generally takes about 10 days and must be completed within 45 days of submission. Soil maps from a soil scientist are required where the site calls for them, and larger conventional or alternative systems need an engineered design. ## What the rules do not say There is no blanket statutory requirement that a Tennessee homeowner pump a conventional residential septic tank on a fixed schedule. The three-to-five-year interval is engineering practice, and it is the interval that keeps solids out of the drain field — but it is guidance, not law. There is also no blanket state requirement for a septic inspection at the point of sale. In practice buyers, agents and lenders request one often enough that it functions as a condition of most transactions, and Tennessee’s residential property disclosure obligations still apply to defects the seller knows about. Permitted alternative and engineered systems are different: those can carry operating, monitoring and maintenance conditions written into the permit itself, and those conditions are enforceable. ## Sources - Regulations to govern subsurface sewage disposal systems - Septic tank capacity, Rule 0400-48-01-.08 - Design of septic tanks, Rule 0400-48-01-.09 - Septic Tank Pumping Contractor, Rule 0400-48-01-.20 - Tennessee Private Sewage Disposal Code, Chapter 8 Tanks Want this answered for your actual property? A pump-out with inspection replaces every general figure on this page with the numbers for this specific system — sludge depth, component condition, and a dated next-service interval. ## Frequently asked questions What size septic tank does Tennessee require? + Minimum liquid capacity for one- and two-family dwellings follows the sizing table in the Tennessee Private Sewage Disposal Code, with 750 gallons as the practical floor and 1,000 to 1,500 gallons covering most single-family homes. Cast-in-place concrete tanks over 1,000 gallons carry additional construction requirements under Rule 0400-48-01-.09. Can a homeowner install their own septic system in Tennessee? + No. Tank placement and drainfield work must be carried out by a licensed subsurface sewage disposal system installer, and the inspector signs off before backfill. Does Tennessee require septic tanks to be pumped on a schedule? + The state does not impose a universal homeowner pumping schedule for conventional residential systems. The three-to-five-year interval is engineering practice rather than statute. Permitted alternative systems can carry operating and maintenance requirements of their own. How can I check a septic contractor is permitted? + Look at the truck. Vehicles engaged in domestic septage removal must display the firm name and address plus the removal permit number in lettering at least two inches high on a contrasting background, along with a department-issued sticker. ## Keep reading - Rules & Permits Do I Need a Permit for Septic Work in Davidson County? Pumping does not need a permit. Almost everything else that opens the ground does — and Davidson County is one of the contract counties with an extra layer. Read the guide - Decision Guide How Does Karst Ground Affect a Septic System in Middle Tennessee? Fractured limestone under a thin soil mantle is the defining ground condition across Davidson County, and it changes both how a system fails and where a new one can go. Read the guide - Rules & Permits Is a Septic Inspection Required to Sell a House in Tennessee? There is no blanket state requirement. There is, in practice, a buyer's agent who will ask — and the timing of when you find out is worth real money. Read the guide - Decision Guide How Often Should a Nashville Tank Be Emptied? Three to five years is the rule of thumb. Here is what actually decides where a specific Nashville system falls in that range — and how to replace the guess with a date. Read the guide Related service ## Septic Tank Inspection A documented look at tank condition — walls, baffles, filter and liquid level — done with the tank empty, where every defect is actually visible. Work it out yourself - Cost estimator → A range in three questions, formula shown in full. - Urgency assessment → Nine questions and a clear next step. - Pre-hire checklist → What to ask before booking any septic contractor. Bottom line (615) 555-0199 615 Septic Tank Pumping covers Nashville and Davidson County. General figures get you to a decision; an on-site reading gets you a number. Price is confirmed before any work starts. ## Get a price for this property Two short steps. A person calls back with a price — not an automated sequence. Still not sure what the system needs? Nine questions in the urgency assessment will tell you whether this is an emergency, a booking, or something to keep an eye on.