Septic system requirements in Juneau, Alaska

The septic rules landplan.io applies in Juneau, what a septic tank costs there, and the parcel data we hold.

Updated 6 October 2026

Design a septic system for an address in Juneau

Alaska's state rules apply in Juneau: landplan.io has no county rules of its own here. State rules: Reviewed See Alaska's rules

6system types permitted

1,000 gallonssmallest septic tank

Partly coveredparcel data

Septic systems allowed in Juneau

The system types landplan.io permits in Juneau:

Mound System
Cut and Fill system
Deep trench system
Leach pit system
Leach field
Surface Discharge

Septic tank size in Juneau

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 Juneau

Minimum distances
From	To	Distance
Polygon	Existing Septic Component to be Abandoned	5 ft

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

Parcel data in Juneau

landplan.io has parcel boundaries for part of Juneau (20.9% of its area). Elsewhere you draw the lot on the map.

Septic companies, designers and jobs in Alaska

Where the rules come from

The regulations and documents landplan.io's Juneau, Alaska rules are read from:

18 AAC 72 - Wastewater Disposal (full chapter: general provisions, individual/on-site water and wastewater systems, conventional and alternative onsite wastewater systems, and definitions) (18 Alaska Administrative Code (AAC) 72.005 through 72.990 (all articles))

Near Juneau

Questions

What septic systems are allowed in Juneau?

landplan.io designs by Alaska's state rules there and permits: Mound System, Cut and Fill system, Deep trench system, Leach pit system, Leach field and Surface Discharge.

What size septic tank do I need in Juneau?

landplan.io sizes the septic tank in Juneau 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 Juneau, Alaska?

For part of it (20.9% of its area); elsewhere you draw the lot on the aerial map.