Alabama Septic Tank Rules, Permits, and Licensing
Updated 2026-08-11
Septic work in Alabama is governed by two separate bodies, and most homeowners only find out about the second one after something goes wrong. The health department handles permits. A separate state board licenses the people who do the work.
This page covers who regulates what, which rules apply, and how to check a license before you hire anyone.
Who regulates septic systems in Alabama
The Alabama Department of Public Health runs the onsite sewage program through its Community Environmental Protection Division and its Soil and Onsite Sewage Branch. ADPH describes that branch's role as coordinating the onsite sewage program in the county health departments.
In practice, that means the rules are written at the state level and applied at the county level. Your permit application, your soil evaluation, and your final approval all go through your county health department, not through Montgomery. Two counties can run noticeably different offices under the same rulebook, which is why the county pages on this site exist.
The two rule chapters that actually apply
ADPH publishes two administrative chapters covering onsite sewage:
- Chapter 420-3-1, Onsite Sewage Treatment and Disposal. This is the main rulebook covering system design, permitting, installation, and approval. It goes down to construction specifics, including rule 420-3-1-.58 covering gravel field pipe standards.
- Chapter 420-3-6, Septage Management. This governs septage, meaning the material actually pumped out of your tank, and what a licensed pumper is permitted to do with it afterward.
What the Alabama Onsite Wastewater Board licenses
The Alabama Onsite Wastewater Board was created in 1999 to examine, license, and regulate people engaged in the manufacture, installation, or servicing of onsite wastewater systems in Alabama. The board currently oversees more than 1,200 licensed professionals.
License classes include Basic Installer, Level I Installer, Level II Installer, Pumper, and Manufacturer. Those are different licenses. A company licensed to pump your tank is not automatically licensed to install or repair a system, and the distinction matters when you are quoted for a repair.
How to verify a license before you hire
The AOWB publishes a public roster search covering its licensees. Before you pay anyone for septic work, look them up. A legitimate operator will also publish their license numbers, and some do: one Cullman County company publishes its AOWB Installer and Pumper numbers directly on its website.
This is the single cheapest check available to a homeowner and almost nobody does it.
Getting records for an existing system
If you are buying a home with an existing septic system, ADPH says a property owner can contact the local health department to request septic tank information. A records request can return a diagram of the actual system installation along with other information about the system.
That diagram is worth requesting before you close. It tells you where the tank and field actually are, which determines what you can build, pave, or plant later.
Common questions
- Do I need a permit to install a septic system in Alabama?
- Onsite sewage installation is permitted through your county health department under ADPH Chapter 420-3-1, which covers the design, permitting, installation, and approval of onsite systems. Contact your county health department's environmental office for the current application process and fees, which are generally not published online.
- Who is allowed to install or pump a septic tank in Alabama?
- The Alabama Onsite Wastewater Board licenses people engaged in the manufacture, installation, or servicing of onsite wastewater systems, across classes including Basic Installer, Level I and Level II Installer, Pumper, and Manufacturer. You can verify any licensee through the board's public roster search.
- Which Alabama rules cover septic systems?
- Two chapters. Chapter 420-3-1 covers Onsite Sewage Treatment and Disposal. Chapter 420-3-6 covers Septage Management, meaning the handling and disposal of what gets pumped out of your tank.
- Can I get a diagram of my existing septic system?
- Yes. ADPH states that property owners can contact the local health department to request septic tank information, and that a records request can include a diagram of the actual system installation.