Who is allowed to install a septic system in Indiana
Indiana does not license septic installers at state level. There is no state card to ask for, because the state does not issue one. What exists instead is a county layer: many county health departments require an installer to hold an IOWPA certificate, and some counties run their own installer permit and their own exam on top of that. The requirement where you live is set by your county, and the association that issues the certificate says plainly that the list of counties requiring it changes frequently.
Is there an Indiana septic installer license?
No. The Indiana Professional Licensing Agency publishes the professions it licenses, and septic, onsite sewage and wastewater contractors are not among them. Plumbing is licensed; installing a septic system is not the same trade and is not covered by it.
Source: Indiana Professional Licensing Agency, professions list, read 2026-08-20.
What is an IOWPA certificate, and does my county require one?
IOWPA, the Indiana Onsite Wastewater Professionals Association, issues voluntary installer and inspector certificates. In its own words, many counties now require installers to hold an IOWPA certificate, and that list of counties changes frequently, so the county health department is the place to confirm. Certificates are personal, are not transferable, and carry 20 hours of continuing education every three years.
So the honest answer to "does my county require it" is that your county health department is the only place that answer is current. The association itself says so and gives its own phone number for the question, which tells you how often it moves.
Source: IOWPA, Installer and Inspector Certificates, read 2026-08-20.
Do some counties go further than that?
Some counties run their own installer permit on top of that. Clark County publishes an Application for Private Sewage Disposal Installer Permit, a septic installer exam, and an annual list of permitted installers.
Where a county runs a permitted-installer list, that list is also the most useful thing on the county's website for a homeowner: it is the set of people that county will actually let work on your system.
Source: Clark County Health Department, read 2026-08-20.
What should I ask a contractor before hiring one?
- Do you hold a current IOWPA installer certificate, and can I see it.
- Does this county require an installer permit, and are you on its list this year.
- Who is doing the soil evaluation, and is that person a soil scientist.
- Who pulls the permit, you or me, and whose name goes on it.
- Who calls the county for the inspection before the system is covered.
A contractor who cannot answer the first two in your county is telling you something useful.
Why does this matter if the county inspects the work anyway?
Because the inspection happens after the digging. A system that fails inspection is a second excavation, and the county can require the work corrected within a time limit it sets. Checking the credential first is cheaper than fixing the system twice.
Source: 410 IAC 6-8.3-55(a) and (b), read 2026-08-20.
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Tell us the county and the jobLast reviewed 2026-08-20.