How much does a septic tank cost by state?
Nationally, a new septic system averages $8,016 installed, with most jobs landing between $3,590 and $12,463[1]. We have no source that publishes installed septic prices state by state that we could verify. What exists is a national band and a handful of state rules. Our three region tiers are our own assumptions (−15% / 0 / +25%), not measured regional prices.
Septic permit and perc-test rules, state by state
Before any dollar figure matters, your state decides two things: whether you need a permit and what soil testing has to happen first. The table below covers 17 states, each row built from that state’s own permitting pages, with a link to the rules. Original retrieval recorded 2026-07-30 (those copies were not retained); every quoted passage was checked against copies of the pages saved on 2026-10-05. Rules change, so confirm with your county office before you dig. In most of the 17 states below the fee is set locally. Tennessee publishes a statewide schedule: $400 for a new conventional-system permit and $500 for an alternative system, both up to 1,000 gpd design flow[2]. Elsewhere, check the current amount with the office named in the table.
| State | Who issues the permit (our summary) | Permit required (new / repair) | Perc / soil test | Typical permit fee (our summary) | The actual rules |
|---|---|---|---|---|---|
| Alabama | Alabama Department of Public Health — onsite sewage program run through county health departments | Yes — ADPH sets and enforces design, permitting, installation and approval requirements; its Soil and Onsite Sewage Branch coordinates the county health department programs. (source) | Soil evaluation runs through the county health department; ADPH’s Soil and Onsite Sewage Branch coordinates the county programs. (source) | Varies by county health department. | ADPH onsite sewage program (septic tank permits & records) |
| California | State Water Resources Control Board OWTS Policy; permits issued by local agencies (county/city environmental health) under Local Agency Management Programs | Statewide OWTS Policy (adopted 2012); check your county or city agency. (source) | Siting and design standards come from the statewide OWTS Policy; check your county or city agency. (source) | Varies by county/city local agency. | OWTS Policy (statewide) + your county LAMP |
| Florida | Florida DEP Onsite Sewage Program (transitioning from FL DOH); county health departments handle permitting in most counties | Yes — application (DEP4015), site plan and floor plan go to your county health department (DEP directly in Northwest Florida and Marion County). (source) | Yes — a site evaluation assessing soil, topography and other conditions is part of the application. (source) | Varies by county — the county health department sets the total permitting fee (including any county fees). | FL DEP Onsite Sewage Program (Chapter 62-6, F.A.C.) |
| Georgia | County health departments / county boards of health under Georgia DPH Rules Chapter 511-3-1 | Yes — no lot development or system installation without a construction permit from the County Health Department first. (source) | Yes — soil evaluations by DPH-certified evaluators per the state on-site manual. (source) | Varies by county health department. | Ga. Comp. R. & Regs. Chapter 511-3-1 |
| Michigan | Local (county/district) health departments; EGLE Onsite Wastewater Management Unit oversees under the Public Health Code | Yes — through your local health department’s sanitary code; onsite wastewater management is a required local health department service under Act 368 of 1978. (source) | Local requirements govern — EGLE’s guidance is to confirm requirements with your local health department before work. (source) | Varies by county/district health department. | EGLE onsite wastewater management (local sanitary codes) |
| Minnesota | Minnesota Pollution Control Agency (MPCA) SSTS program; county and other local government programs issue permits | Yes — county and local SSTS programs review plans, approve permits and inspect new and replacement systems. (source) | Site evaluations run through your county SSTS program alongside permits and inspections. (source) | Varies by county/local SSTS program. | MPCA SSTS program (Minn. R. 7080–7083) |
| Missouri | Missouri Department of Health and Senior Services (DHSS) OWTS program; local health departments issue permits in most counties | Yes — generally a permit before construction or repair, though DHSS notes that certain residential properties may be exempt from state permitting requirements; in most counties the local health department issues the permit. (source) | Site and soil conditions drive the design; DHSS links a Find a Professional directory from its onsite wastewater page. (source) | Varies by county (local health department or other permitting authority). | Missouri DHSS onsite wastewater program (Find a Professional directory) |
| North Carolina | Local health departments with the NC DHHS On-Site Water Protection Branch (G.S. 130A-336) | Yes — an improvement permit and construction authorization are required by statute before construction. (source) | Yes — the proposed site must be evaluated by the local health department, or by a licensed engineer, soil scientist or geologist under the engineered/AOWE permit options. (source) | Varies by county health department. | G.S. 130A-336 + 15A NCAC 18E |
| New York | NYS Department of Health standards (10 NYCRR 75.5 + Appendix 75-A); approvals by State or county health department officials | Yes — systems must be designed and built to Appendix 75-A standards; alternative-system plans need review and approval by the State or county health department official having jurisdiction. (source) | Systems are designed and built to the Appendix 75-A standards; ask the State or county health department official having jurisdiction. (source) | Varies by county health department. | Appendix 75-A (Wastewater Treatment Standards — Residential Onsite Systems) |
| Ohio | Ohio Department of Health Sewage Treatment Systems program; local health districts permit, inspect and enforce | Yes — local health districts run permitting, inspections and enforcement, and may adopt stricter rules than the state baseline. (source) | Soils evaluation is part of proper siting and design under the state program. (source) | Varies by local health district. | ODH Sewage Treatment Systems program (OAC 3701-29) |
| Oregon | Oregon DEQ — permits directly in Curry, Jackson and Josephine counties; contract local governments in the other 33 | Yes — permits are required to install, alter or repair a septic system. (source) | Yes — a site evaluation with soil test pits in the proposed initial and replacement absorption areas comes first; the construction-installation permit is a separate application. (source) | In DEQ’s three counties, fees are invoiced through Oregon e-Permitting; elsewhere, check with your local permitting office. | Oregon DEQ onsite wastewater rules (OAR 340-071) |
| Pennsylvania | PA DEP Act 537 Sewage Facilities Program; onlot systems administered by municipal local agencies (sewage enforcement officers) | Yes — Act 537 planning and permitting, administered at the municipal level by local agencies and their sewage enforcement officers. (source) | DEP’s page points to 25 Pa. Code Chapter 73 (Standards for Onlot Sewage Treatment Facilities); ask your local agency what testing it requires. (source) | Varies by municipality/local agency. | Act 537 + 25 Pa. Code Chapter 73 |
| South Carolina | South Carolina Department of Environmental Services (SCDES) — statewide septic permitting (formerly DHEC) | Yes — a state permit to construct, and without it you cannot get a county building permit. (source) | Yes — SCDES evaluates the building site before issuing the permit to construct. (source) | Check the current fee with SCDES. | S.C. Regulation 61-56 (Onsite Wastewater Systems) |
| Tennessee | Tennessee Department of Environment and Conservation (TDEC), Division of Water Resources — state-issued SSDS permits | Yes — a Septic System Construction Permit from TDEC for any new install or repair of a faulty system. (source) | TDEC evaluates the site; soils maps by a licensed soil scientist and engineered designs are required where the system type demands them. (source) | State fee schedule published by TDEC (repairs: no permit fee). New conventional $400, alternative $500 (≤1,000 gpd)[2] | TDEC SSDS construction permit (fee schedule on page) |
| Texas | Texas Commission on Environmental Quality (TCEQ) — OSSF program, permits issued by TCEQ-authorized local agents | Yes — to construct, install, alter, extend or repair an OSSF (narrow exemptions: qualifying 10-acre single-residence sites and reported emergency repairs). (source) | Yes — a licensed site evaluator or professional engineer runs a preconstruction site evaluation including a soil analysis in the proposed disposal area. (source) | Varies by county/authorized agent (local programs may be stricter than state minimums). | 30 TAC Chapter 285 (OSSF rules) |
| Virginia | Virginia Department of Health (VDH) Onsite Sewage & Water Services — permits through local health departments | Yes — VDH construction permits under the Sewage Handling and Disposal Regulations, plus an operation permit after inspection before you may use the system. (source) | Conditional construction permits exist for systems that do not fully conform to parts of the Sewage Handling and Disposal Regulations; ask your local health department about site evaluation. (source) | Check the current fee with your local health department. | VDH Sewage Handling and Disposal Regulations |
| Washington | Local health jurisdictions under Washington DOH rules (Chapter 246-272A WAC) | Yes — except for a minor repair, an application and permit from the local health officer before installing, repairing, modifying, connecting to or expanding a system. (source) | Yes — soil and site evaluations by professional engineers, designers or local health officers under WAC 246-272A-0220. (source) | Varies by local health jurisdiction. | Chapter 246-272A WAC |
This table covers 17 states; others will be added when their rules are confirmed. In the 17 states above, a permit is required before construction, with narrow exemptions in some (Texas, for example). The permits and perc test guide walks the sequence step by step.
The calculator's region tiers: our assumptions
We do not have a source for regional install prices. Our install cost calculator handles geography with a region toggle and three tiers, and the factors are our own labeled adjustments — assumed, no direct source: the lower-cost tier trims the national bands by 15% (a conventional system with the permit fee only becomes $4,950, range $2,600–$7,300), and the higher-cost tier adds 25%. The national conventional band they adjust is $3,000–$8,000[3].
| Tier | Calculator adjustment |
|---|---|
| Lower-cost | −15% (our assumption) |
| National average | ±0% (default) |
| Higher-cost | +25% (our assumption) |
How to actually budget for your state
Get the county's fee schedule, get the perc result, and then price the system type your soil supports. SepticTankHub prices the permit fee alone at $50–$500[4] and the full perc-design-permit-inspection sequence at $800–$3,500[4]; which one applies is your county's decision. The permits and perc test guide covers the sequence, and the calculator assembles the whole estimate — system, soil, region tier, permits — with every source shown. No email, no sign-up.
Frequently asked questions
How much does a septic tank cost by state?
$8,016 is the national average install, with most jobs between $3,590–$12,463 (HomeAdvisor). We have no source that publishes installed septic costs state by state that we could verify, so this page gives the national band, the permit and soil-test rules for 17 states, and our labeled region assumptions.
Which states are most expensive for septic systems?
We have no source that ranks states by install cost. Our calculator's higher-cost tier adds 25% to the national bands — a labeled assumption, not a measured state average.
What is a Title 5 inspection in Massachusetts?
Title 5 is the Massachusetts septic inspection that HomeGuide prices in its real-estate band, $300–$650 (historical figure from an archived copy of HomeGuide's page). EPA notes that in many states a septic system must be inspected when real estate is transferred; check your state's rule.
How much is a septic permit?
SepticTankHub prices the permit fee alone at $50–$500 and the full sequence — perc test, design, permit, inspection — at $800–$3,500. Which one your project needs is your county's decision. Of the 17 states in the table, Tennessee publishes a statewide fee schedule.
Sources for the figures on this page
- HomeAdvisor — https://www.homeadvisor.com/cost/plumbing/install-a-septic-tank/ (retrieved 2026-10-05 (saved copy of the page kept))
- TDEC Division of Water Resources — https://www.tn.gov/environment/permits/water/septic-systems-permits/ssp/permit-water-septic-system-construction-permit.html (retrieved 2026-07-30; that copy was not retained — checked against our saved copy of 2026-10-05)
- Angi — historical figure from an archived copy: Internet Archive snapshot of January 13, 2026, https://web.archive.org/web/20260113173155/https://www.angi.com/articles/what-does-it-cost-install-septic-system.htm (first recorded 2026-07-30; the snapshot was saved again 2026-10-05; live page https://www.angi.com/articles/what-does-it-cost-install-septic-system.htm)
- SepticTankHub 2026 permit guide — https://www.septictankhub.com/blog/septic-system-permit-requirements/ (retrieved 2026-07-30; that copy was not retained — checked against our saved copy of 2026-10-05)