Hamilton County septic permits
Hamilton County publishes its septic permit procedures, its permit application and a separate abandonment form, and it sizes systems the way the state rule does: a design flow of 150 gallons per day per bedroom, divided by the soil loading rate a registered soil scientist measures on your lot.
Who issues a septic permit in Hamilton County?
The Hamilton County Health Department. Under the state rule the owner or the owner's agent has to obtain a written construction permit signed by the health officer before the work starts, and in Indiana that health officer is the county's, not the state's.
Source: 410 IAC 6-8.3-53(a), Indiana Administrative Code, read 2026-08-20.
What does Hamilton County do differently?
- The county sizes a system using a design flow of 150 gallons per day per bedroom, divided by the soil loading rate specified in 410 IAC 6-8.3, and a registered soil scientist determines that loading rate during an on-site soil evaluation. Source: Hamilton County Health Department, Permits, read 2026-08-20.
- The health department holds the current list of registered soil scientists and installers, and says to contact it for that list rather than relying on an older copy. Source: Hamilton County Health Department, Permits, read 2026-08-20.
- It publishes a new-construction permit procedure, a septic permit application and an on-site septic system abandonment form as separate documents. Source: Hamilton County Health Department, Permits, read 2026-08-20.
Which towns does this cover?
Hamilton County sits in the Indianapolis ring area, with Noblesville as the county seat. Towns served include Noblesville, Westfield, Cicero, Arcadia, Sheridan. Anywhere in the county that is not on a sanitary sewer is on a system this page applies to.
Who can legally do the work here?
Indiana has no state septic installer license, so the answer is set by this county. Many Indiana counties require an IOWPA certificate, and some run their own installer permit and exam. Check with the Hamilton County Health Department before you sign anything, because the requirement is different one county over.
How Indiana county installer requirements work
Source: Indiana Professional Licensing Agency, professions list, read 2026-08-20.
What comes before the application?
Before any construction permit is issued, and before a soil absorption system is replaced or altered, an on-site evaluation including a description of the soil profile has to be conducted. The soil is described by a soil scientist using NRCS guidelines, and the profile is recorded to a depth of five feet or until a layer is reached that cannot be read.
So the first call is usually a soil scientist, not a contractor with a machine. See the soil evaluation and the application sequence.
Source: 410 IAC 6-8.3-56(a) to (c), read 2026-08-20.
The county's own page
Fees, forms and lists change without notice, and the county is the only current source. Hamilton County Health Department.
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Tell us the county and the jobLast reviewed 2026-08-20.