Septic permit rules and requirements in Illinois
In Illinois, the state sets the rule. The septic permit comes from your local health department. For some systems the state issues it itself. The code is 77 Ill. Adm. Code 905 (Private Sewage Disposal Code). 77 Ill. Adm. Code 905.190 · checked 2026-09-11
Your local health department
Issues the permit
checked 2026-09-11
77 Ill. Adm. Code 905 (Private Sewage Disposal Code)
Code section
checked 2026-09-23
Who decides a septic permit in Illinois
Your local health department issues an ordinary residential permit. For some systems the state issues it itself. The state sets the floor.
Section 905.190 says who must approve a new septic system. The department or a local authority must approve it before work starts.
77 Ill. Adm. Code 905.190 · checked 2026-09-11
The office publishes its own page on this: Illinois Department of Public Health — Private Sewage Disposal.
This is the department's page on private sewage disposal.
Illinois Department of Public Health — Private Sewage Disposal · checked 2026-09-23
The floor state law sets
The rules that govern every septic system in Illinois are 77 Ill. Adm. Code 905 (Private Sewage Disposal Code). Every local permit is issued under them.
Part 905 sets rules for how to build and permit septic systems. The Private Sewage Disposal Licensing Act is its legal base.
Illinois Administrative Code, Title 77, Part 905 · checked 2026-09-23
Illinois counties on this site
We have not published a Illinois county page yet. A county earns a page when we hold facts unique to it. Until then this page is the answer for every county in the state.
Telling us your county is how we decide which one to build next.
Sources
State records only. Each figure above has a government source and a checked-on date. County figures live on the county pages.
Verify before you act. Septic rules are set locally and they change. Check anything here with your local health department before you spend money on it.