Septic system requirements in Arkansas
What landplan.io applies when it designs a septic system in Arkansas: 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 Arkansas
Reviewed landplan.io designs by Arkansas's own rules, which our staff reviewed against the state's regulations. Last published 5 October 2026.
Septic systems allowed in Arkansas
The system types landplan.io permits in Arkansas:
- Conventional Trench System
- Drip Dispersal System
- Low Pressure Distribution
- Surface Discharging System
Septic tank size in Arkansas
The daily design flow of a home: 150 gal/day per bedroom, at least 150 gal/day. The septic tank is sized from that flow:
| Daily design flow | Minimum tank |
|---|---|
| up to 370 gal/day | 1,000 gallons |
| 370 to 450 gal/day | 1,250 gallons |
| 450 to 500 gal/day | 1,500 gallons |
| 500 to 550 gal/day | 1,750 gallons |
| 550 to 600 gal/day | 2,000 gallons |
| 650 to 700 gal/day | 2,250 gallons |
| 700 to 750 gal/day | 2,500 gallons |
| 750 to 800 gal/day | 2,750 gallons |
| 850 to 900 gal/day | 3,000 gallons |
| 900 to 950 gal/day | 3,250 gallons |
| 950 to 1,000 gal/day | 3,500 gallons |
| 1,000 to 1,050 gal/day | 3,750 gallons |
| Bedrooms | Daily design flow |
|---|---|
| 1 | 150 gal/day |
| 2 | 270 gal/day |
| 3 | 370 gal/day |
| 4 | 450 gal/day |
| 5 | 500 gal/day |
| 6 | 550 gal/day |
| 7 | 600 gal/day |
| 8 | 650 gal/day |
| 9 | 700 gal/day |
| 10 | 750 gal/day |
| 11 | 800 gal/day |
| 12 | 850 gal/day |
| 13 | 900 gal/day |
| 14 | 950 gal/day |
| 15 | 1,000 gal/day |
Septic setbacks in Arkansas
| From | To | Distance |
|---|---|---|
| LineString | Stream | 100 Ft |
| LineString | Water service line | 10 Ft |
| Point | Point of intake of public water supply | 300 Ft |
| Point | Spring as a public water supply | 300 Ft |
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
| Polygon | Lake | 100 Ft |
| Polygon | Sinkhole | 100 Ft |
These are the values the landplan.io design engine applies in Arkansas. Confirm a design with the Arkansas health department or your county's before you build.
Parcel data in Arkansas
landplan.io has parcel boundaries for 75 of Arkansas's 75 counties: the counties where 100% of the state's people live. Type an address there and the design starts from the parcel.
Septic companies, designers and jobs in Arkansas
- Septic companies and distributors in Arkansas (13)
- Septic designers in Arkansas
- Septic design jobs in Arkansas
Where the rules come from
The regulations and documents landplan.io's Arkansas rules are read from:
Septic rules by county in Arkansas
- Arkansas County
- Ashley County
- Baxter County
- Benton County
- Boone County
- Bradley County
- Calhoun County
- Carroll County
- Chicot County
- Clark County
- Clay County
- Cleburne County
- Cleveland County
- Columbia County
- Conway County
- Craighead County
- Crawford County
- Crittenden County
- Cross County
- Dallas County
- Desha County
- Drew County
- Faulkner County
- Franklin County
- Fulton County
- Garland County
- Grant County
- Greene County
- Hempstead County
- Hot Spring County
- Howard County
- Independence County
- Izard County
- Jackson County
- Jefferson County
- Johnson County
- Lafayette County
- Lawrence County
- Lee County
- Lincoln County
- Little River County
- Logan County
- Lonoke County
- Madison County
- Marion County
- Miller County
- Mississippi County
- Monroe County
- Montgomery County
- Nevada County
- Newton County
- Ouachita County
- Perry County
- Phillips County
- Pike County
- Poinsett County
- Polk County
- Pope County
- Prairie County
- Pulaski County
- Randolph County
- Saline County
- Scott County
- Searcy County
- Sebastian County
- Sevier County
- Sharp County
- St Francis County
- Stone County
- Union County
- Van Buren County
- Washington County
- White County
- Woodruff County
- Yell County
Questions
What septic systems are allowed in Arkansas?
landplan.io permits these system types in Arkansas: Conventional Trench System, Drip Dispersal System, Low Pressure Distribution and Surface Discharging System.
What size septic tank do I need in Arkansas?
landplan.io sizes the septic tank in Arkansas from the daily design flow: up to 370 gal/day: 1,000 gallons; 370 to 450 gal/day: 1,250 gallons; 450 to 500 gal/day: 1,500 gallons; larger flows need larger tanks. A home's design flow is 150 gal/day per bedroom, at least 150 gal/day.
Does landplan.io have parcel data in Arkansas?
Yes, for 75 of Arkansas's 75 counties.