Septic system requirements in Arizona
What landplan.io applies when it designs a septic system in Arizona: 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 Arizona
Reviewed landplan.io designs by Arizona's own rules, which our staff reviewed against the state's regulations. Last published 5 October 2026.
Septic systems allowed in Arizona
The system types landplan.io permits in Arizona:
- Wisconsin Mound System
- Pressure Distribution Trenches
- Trench System
- Subsurface Drip Irrigation
- Cap System
- Infiltrator Advanced Treatment Leachfield (ATL)
- Infiltrator Advanced Enviro-Septic® (AES)
- Spray Surface Irrigation System
- Discharging System
Septic tank size in Arizona
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 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 |
| Bedrooms | Daily design flow |
|---|---|
| 1 | 150 gal/day |
| 2 | 300 gal/day |
| 3 | 450 gal/day |
| 4 | 600 gal/day |
| 5 | 750 gal/day |
| 6 | 900 gal/day |
| 7 | 1,050 gal/day |
| 8 | 1,200 gal/day |
Septic setbacks in Arizona
| From | To | Distance |
|---|---|---|
| LineString | Domestic service water line | 5 ft |
| LineString | Downslopes or cut banks greater than 15 percent, culverts, and ditches | 50 ft |
| LineString | Perennial or intermittent stream | 100 ft |
| LineString | Water main or branch water line | 10 ft |
| Point | Drinking water intake from a surface water source (includes an open water body, downslope spring or a well tapping streamside saturated alluvium) | 200 ft |
| Point | Public or private water supply well | 100 ft |
| Polygon | Building | 10 ft |
| Polygon | Driveway | 5 ft |
| Polygon | Earth fissures | 100 ft |
| Polygon | Easement (except drainage easement) | 5 ft |
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
| Polygon | Lake, reservoir, or canal | 100 ft |
| Polygon | Swimming pool excavation | 5 ft |
| Polygon | Wash or drainage easement with a drainage area of more than 20 acres | 50 ft |
These are the values the landplan.io design engine applies in Arizona. Confirm a design with the Arizona health department or your county's before you build.
Parcel data in Arizona
landplan.io has parcel boundaries for 8 of Arizona's 15 counties, and part of 6 more: the counties where 34% of the state's people live. Type an address there and the design starts from the parcel.
Septic companies, designers and jobs in Arizona
- Septic companies and distributors in Arizona (15)
- Septic designers in Arizona
- Septic design jobs in Arizona
Where the rules come from
The regulations and documents landplan.io's Arizona rules are read from:
Septic rules by county in Arizona
- Apache County
- Cochise County
- Coconino County
- Gila County
- Graham County
- Greenlee County
- La paz County
- Maricopa County
- Mohave County
- Navajo County
- Pima County
- Pinal County
- Santa cruz County
- Yavapai County
- Yuma County
Questions
What septic systems are allowed in Arizona?
landplan.io permits these system types in Arizona: Wisconsin Mound System, Pressure Distribution Trenches, Trench System, Subsurface Drip Irrigation, Cap System, Infiltrator Advanced Treatment Leachfield (ATL), Infiltrator Advanced Enviro-Septic® (AES), Spray Surface Irrigation System and Discharging System.
What size septic tank do I need in Arizona?
landplan.io sizes the septic tank in Arizona 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 150 gal/day.
How far must a septic system be from a well in Arizona?
landplan.io keeps these distances in Arizona: Point to drinking water intake from a surface water source (includes an open water body, downslope spring or a well tapping streamside saturated alluvium): 200 ft; Point to public or private water supply well: 100 ft.
Does landplan.io have parcel data in Arizona?
Yes, for 8 of Arizona's 15 counties, and part of 6 more.