Septic system requirements in Louisiana
What landplan.io applies when it designs a septic system in Louisiana: the system types allowed, tank sizes, setbacks and soil loading rates, with what septic products cost there.
Updated
Design a septic system for an address in Louisiana
Reviewed landplan.io designs by Louisiana's own rules, which our staff reviewed against the state's regulations. Last published 5 October 2026.
Septic systems allowed in Louisiana
The system types landplan.io permits in Louisiana:
- 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 Louisiana
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:
| 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 Louisiana
| From | To | Distance |
|---|---|---|
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
These are the values the landplan.io design engine applies in Louisiana. Confirm a design with the Louisiana health department or your county's before you build.
Parcel data in Louisiana
landplan.io has parcel boundaries for 44 of Louisiana's 64 counties, and part of 2 more: the counties where 79.3% of the state's people live. Type an address there and the design starts from the parcel.
Septic companies, designers and jobs in Louisiana
- Septic companies and distributors in Louisiana (24)
- Septic designers in Louisiana
- Septic design jobs in Louisiana
Where the rules come from
The regulations and documents landplan.io's Louisiana rules are read from:
- Sanitary Code, Individual Sewerage Systems (Louisiana Administrative Code Title 51, Part XIII, Chapter 7) (LAC 51:XIII.701-741 (Ch. 7))
- LAC 51:XIII Chapter 3 - General Requirements for Sewage Disposal (Louisiana State Sanitary Code, Part XIII, sections 301-309) (LAC 51:XIII.301-309)
- LAC 51:XIII Chapter 15 - Sewage Loading Criteria (Louisiana State Sanitary Code, Part XIII Sewage Disposal, section 1501) (LAC 51:XIII.1501)
- LAC 51 Part XII - Water Supplies (Louisiana State Sanitary Code), from the Office of the State Register (one page per section) (LAC 51:XII)
Septic rules by county in Louisiana
- Acadia Parish
- Allen Parish
- Ascension Parish
- Assumption Parish
- Avoyelles Parish
- Beauregard Parish
- Bienville Parish
- Bossier Parish
- Caddo Parish
- Calcasieu Parish
- Caldwell Parish
- Cameron Parish
- Catahoula Parish
- Claiborne Parish
- Concordia Parish
- De soto Parish
- East baton rouge Parish
- East carroll Parish
- East feliciana Parish
- Evangeline Parish
- Franklin Parish
- Grant Parish
- Iberia Parish
- Iberville Parish
- Jackson Parish
- Jefferson Parish
- Jefferson davis Parish
- Lafayette Parish
- Lafourche Parish
- LaSalle Parish
- Lincoln Parish
- Livingston Parish
- Madison Parish
- Morehouse Parish
- Natchitoches Parish
- Orleans Parish
- Ouachita Parish
- Plaquemines Parish
- Pointe coupee Parish
- Rapides Parish
- Red river Parish
- Richland Parish
- Sabine Parish
- St bernard Parish
- St Charles Parish
- St helena Parish
- St james Parish
- St john the baptist Parish
- St landry Parish
- St martin Parish
- St mary Parish
- St tammany Parish
- Tangipahoa Parish
- Tensas Parish
- Terrebonne Parish
- Union Parish
- Vermilion Parish
- Vernon Parish
- Washington Parish
- Webster Parish
- West baton rouge Parish
- West carroll Parish
- West feliciana Parish
- Winn Parish
Questions
What septic systems are allowed in Louisiana?
landplan.io permits these system types in Louisiana: 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 Louisiana?
landplan.io sizes the septic tank in Louisiana 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.
Does landplan.io have parcel data in Louisiana?
Yes, for 44 of Louisiana's 64 counties, and part of 2 more.