"Can I install my own septic system in Tennessee" is a live search, and the honest answer is more interesting than yes or no. Tennessee has an explicit owner exemption from installer permitting. It is also a state where the regulator, not the owner, designs the system and must approve it before it is covered.
Septic Pumping Chattanooga is a free quote service. We connect Chattanooga-area homeowners with independent local septic pumping, inspection and repair companies for free, no-obligation quotes. We do not perform or design septic work. This article quotes the rules as published; it is general information, not legal advice.
The owner exemption, word for word
The installer rule is TDEC Rule 0400-48-01-.19. Paragraph (1)(a) reads: "No person shall engage in the business of constructing, installing, altering or extending or repairing a subsurface sewage disposal system unless he has a valid annual permit issued by the Commissioner. This rule does not apply to the property owner or the property owner's tenant doing his own work on his own property where such property is the residence of the owner or tenant, provided that nothing in this rule shall act to remove the requirement that any person must secure a construction permit as provided by law."
Three limits are built into that sentence. The exemption covers the owner or tenant personally, not a handyman or an unpermitted contractor you pay. It covers your residence, not a rental you own or a lot you are developing. And it does nothing to the permit requirement.
The permit you still need
Rule 0400-48-01-.06(1): "No property owner or installer of a subsurface sewage disposal system shall construct, alter, extend or repair subsurface sewage disposal systems within the State of Tennessee unless he holds a valid construction permit issued by the Commissioner." Paragraph (3) extends it to failures: "Repair permits are necessary when installing tanks (septic or dosing) and/or installing absorption field line in order to correct an existing failure."
TDEC's online-services page puts it in plain English: "A Septic System Repair Permit is required before any work on a failing septic system is performed. The Division of Water Resources will design a repair for the failing septic system and will issue a septic system repair permit." You do not pick the trench length or the tank size; the permit does.
A modification permit is a third category. TDEC requires one for "increasing the number of bedrooms in an existing residence, construction of a pool/garage/shop/barn or any other construction that will impact a portion or all the existing septic system."
Where to get it
Hamilton County is one of nine TDEC "contract counties" that run their own septic programs. Permits come from the Hamilton County Division of Groundwater Protection (Development Services, 1250 Market St, Suite 3046, Chattanooga; 423-209-7876; gwp@hamiltontn.gov), not from TDEC and not from the Health Department. The fees, set by County Resolution 423-28, are government charges separate from any contractor's price:
| Hamilton County Groundwater Protection fee | Amount |
|---|---|
| Repair permit | $40 |
| New-system permit (includes $40 admin and issuance) | $440 |
| Modification permit (adding bedrooms or field lines) | $440 |
| Penalty for starting work before the permit | fees doubled |
Hamilton County Development Services fee schedule and Resolution 423-28 (government fees, not contractor prices).
In Bradley, Marion, Sequatchie and Rhea counties, the permit office is TDEC's Chattanooga Environmental Field Office (423-634-5745).
What doing it yourself actually involves
Apply and wait for the design
The application asks for a site sketch with wells and springs marked. The regulator evaluates the soil and issues a permit that specifies the system.
Build to the permit
Tank size (Rule .08: 750 gallons for two or fewer bedrooms, 900 for three, 1,000 for four), trench length, setbacks and any alternative-system components are all specified. In the clay and shallow rock described in the drain field guide, the design may call for low-pressure pipe, mound or drip components that are not a shovel-and-gravel job.
Call for inspection before covering
TDEC installers "must notify the Division when a system has been installed so that it can be inspected and approved." An owner-built system goes through the same inspection; in Hamilton County a third re-inspection visit costs $150.
Then weigh the economics. A drain field replacement runs $5,000–$12,000 nationally and up to $20,000 (HomeAdvisor, 2026; estimates). The drain field repair page describes what a permitted installer brings to the job.
Pumping is not a DIY job
The owner exemption is about construction and repair. The pumping rule has no owner carve-out. Rule 0400-48-01-.20(1): "Persons engaged in the business of removing and disposing of domestic septage from septic tanks, holding tanks, portable toilets or other similar sewage treatment or disposal facilities covered within the provision of these rules shall obtain an annual permit from the Commissioner." Hamilton County adds its own pumper license.
The disposal rules are the practical barrier. Under Rule .22, domestic septage goes to a wastewater treatment facility when permission can be obtained, and otherwise only to a permitted land-application site, where it must be limed to pH 12 for 30 minutes or injected below the surface. In Chattanooga, haulers discharging to the city system buy a Truck Discharge Operation Permit for $100 per vehicle per fiscal year. A homeowner has no legal destination for a tank's contents. The septic tank pumping page lists what a permitted pump-out includes.
The grey zone: lids, risers, baffles, filters and pumps
The rules define an installer as someone who "installs, constructs, alters, or extends" a system, and the construction permit covers "construct, alter, extend or repair." No TDEC text was found that says whether replacing a cracked lid, adding a riser, repairing a baffle or swapping an effluent pump counts. Call Groundwater Protection first, and if you hire it out, use a company holding a TDEC installer permit that pulls whatever the county requires. The septic repair page covers those components and their typical ranges.
Hiring instead: the thresholds to know
Anyone in the business of repairing or installing needs the TDEC installer permit plus the Hamilton County installer license. A contract of $25,000 or more requires a Tennessee contractor license (TCA 62-6-102), and residential work from $3,000 to under $25,000 in Hamilton and Bradley counties falls under the state Home Improvement license; no septic exemption was found, though this point is unconfirmed for septic work. The TDEC Installers & Pumpers DataViewer and Hamilton County's 2026 "List of Septic Installers and Pumpers" are both public. The regulator guide goes deeper.
Frequently asked questions
Can I install my own septic system in Tennessee?
The rule says yes, with a condition. TDEC Rule 0400-48-01-.19(1)(a) exempts a property owner or tenant doing their own work on their own property where it is their residence from the installer permit, but adds that nothing removes the requirement to secure a construction permit. So you may do the work yourself on your own home, after the regulator issues the permit and designs the system, and it must pass inspection.
Do I need a permit to repair my own septic system in Hamilton County?
Yes. Rule .06(1) says no property owner or installer shall construct, alter, extend or repair a system without a valid construction permit, and Rule .06(3) says repair permits are necessary when installing tanks or absorption field line to correct a failure. In Hamilton County the repair permit comes from the Division of Groundwater Protection and costs $40; county fees are doubled for work started without one.
Can I pump my own septic tank in Tennessee?
Not in any practical sense. Rule 0400-48-01-.20 requires anyone removing and disposing of domestic septage to hold an annual TDEC pumper permit, and septage must go to a wastewater plant with written permission or a permitted land-application site. Chattanooga charges haulers $100 per vehicle per year to discharge at its hauled-waste facility. A homeowner has no legal place to take the contents of a tank, so pumping is hired out.
Can I replace a septic tank lid or riser myself?
Tennessee's rules do not spell out whether swapping a lid, riser, baffle or filter counts as repairing or altering the system. The owner exemption would cover you on your own residence either way, but the permit question is open. Call Hamilton County Groundwater Protection at 423-209-7876 before starting, and if you hire it out, use a company with a TDEC installer permit that pulls any permit the county requires.
Get a quote for the parts you cannot do yourself
Whether that is the pump-out, the inspection that tells you what failed, or the permitted repair, a free, no-obligation quote request takes about a minute. Independent local companies can quote the work and tell you which permit it needs. We usually reply the same day. You can also call: Call (727) 300-6656.