Septic system requirements in Honolulu County, Hawaii
The septic rules landplan.io applies in Honolulu County, what a septic tank costs there, and the parcel data we hold.
Updated
Design a septic system for an address in Honolulu County
Hawaii's state rules apply in Honolulu County: landplan.io has no county rules of its own here. State rules: Reviewed See Hawaii's rules
Septic systems allowed in Honolulu County
The system types landplan.io permits in Honolulu County:
- 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 Honolulu County
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 Honolulu County
| From | To | Distance |
|---|---|---|
| Polygon | Existing Septic Component to be Abandoned | 5 ft |
These are the values the landplan.io design engine applies in Honolulu County. Confirm a design with the Hawaii health department or your county's before you build.
Parcel data in Honolulu County
landplan.io has parcel boundaries for Honolulu County (99.1% of its area): type an address and the design starts from the parcel.
Septic companies, designers and jobs in Hawaii
Where the rules come from
The regulations and documents landplan.io's Honolulu County, Hawaii rules are read from:
Near Honolulu County
Questions
What septic systems are allowed in Honolulu County?
landplan.io designs by Hawaii's state rules there and permits: 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 Honolulu County?
landplan.io sizes the septic tank in Honolulu County 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 for Honolulu County, Hawaii?
Yes: parcel boundaries cover Honolulu County (99.1% of its area).