Septic system requirements in Indiana

What landplan.io applies when it designs a septic system in Indiana: the system types allowed, tank sizes, setbacks and soil loading rates, with what septic products cost there.

Updated 5 October 2026

Design a septic system for an address in Indiana

Reviewed landplan.io designs by Indiana's own rules, which our staff reviewed against the state's regulations. Last published 5 October 2026.

6system types permitted

1,000 gallonssmallest septic tank

264septic companies located here

Septic systems allowed in Indiana

The system types landplan.io permits in Indiana:

Elevated Sand Mound System
Subsurface Pressure Trench System
Subsurface Trench System
Infiltrator Advanced Treatment Leachfield
Infiltrator Advanced Enviro-Septic® (AES)
Discharging System

Septic tank size in Indiana

The daily design flow of a home: 150 gal/day per bedroom, at least 240 gal/day. The septic tank is sized from that flow:

Septic Tank: minimum size by daily design flow
Daily design flow	Minimum tank
up to 240 gal/day	1,000 gallons
240 to 360 gal/day	1,500 gallons
360 to 600 gal/day	2,000 gallons
600 to 720 gal/day	2,500 gallons
720 to 840 gal/day	2,750 gallons
840 to 920 gal/day	3,000 gallons
920 to 1,040 gal/day	3,250 gallons

Septic setbacks in Indiana

Minimum distances
From	To	Distance
LineString	Lot lines	5 ft
LineString	River, stream, ditch, or drainage tile	25 ft
LineString	Suction water lines	50 ft
LineString	Water lines continually under pressure	10 ft
Point	Commercial geothermal well	100 ft
Point	Commercial water supply well	100 ft
Point	Private geothermal well	50 ft
Point	Private water supply well	50 ft
Point	Public water supply well	200 ft
Polygon	Buildings, foundations, slabs, garages, patios, barns, aboveground and belowground swimming pools, retaining walls, closed loop geothermal systems, roads, driveways, parking areas, or paved sidewalks	10 ft
Polygon	Existing Septic Component to be Abandoned	5 ft
Polygon	Pond, retention pond, lake (measured from high water mark)	50 ft
Polygon	Public water supply lake or resevoir	200 ft
Polygon	Storm water detention area (measured from high water mark)	25 ft

These are the values the landplan.io design engine applies in Indiana. Confirm a design with the Indiana health department or your county's before you build.

Septic system costs in Indiana

Delivered prices (October 2026)
Product	Median	Typical range	Listings
Dose Tank	$1,485	$1,395 – $1,522	34
Septic Tank	$1,514	$1,378 – $1,746	64

The Indiana price index: every product type, month by month.

Septic companies, designers and jobs in Indiana

Where the rules come from

The regulations and documents landplan.io's Indiana rules are read from:

Septic rules by county in Indiana

Questions

What septic systems are allowed in Indiana?

landplan.io permits these system types in Indiana: Elevated Sand Mound System, Subsurface Pressure Trench System, Subsurface Trench System, Infiltrator Advanced Treatment Leachfield, Infiltrator Advanced Enviro-Septic® (AES) and Discharging System.

What size septic tank do I need in Indiana?

landplan.io sizes the septic tank in Indiana from the daily design flow: up to 240 gal/day: 1,000 gallons; 240 to 360 gal/day: 1,500 gallons; 360 to 600 gal/day: 2,000 gallons; larger flows need larger tanks. A home's design flow is 150 gal/day per bedroom, at least 240 gal/day.

How far must a septic system be from a well in Indiana?

landplan.io keeps these distances in Indiana: Point to public water supply well: 200 ft; Point to commercial geothermal well: 100 ft; Point to commercial water supply well: 100 ft.