Septic system requirements in Alaska

What landplan.io applies when it designs a septic system in Alaska: the system types allowed, tank sizes, setbacks and soil loading rates, with what septic products cost there.

Updated 6 October 2026

Design a septic system for an address in Alaska

Reviewed landplan.io designs by Alaska's own rules, which our staff reviewed against the state's regulations. Last published 6 October 2026.

Septic systems allowed in Alaska

The system types landplan.io permits in Alaska:

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

Septic tank size in Alaska

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 setbacks in Alaska

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

Parcel data in Alaska

landplan.io has parcel boundaries for 4 of Alaska's 30 counties, and part of 8 more: the counties where 37.3% of the state's people live. Type an address there and the design starts from the parcel.

Septic companies, designers and jobs in Alaska

• Septic companies and distributors in Alaska (6)
• Septic designers in Alaska
• Septic design jobs in Alaska

Where the rules come from

The regulations and documents landplan.io's 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))

Septic rules by county in Alaska

• Aleutians east
• Aleutians west
• Anchorage
• Bethel
• Bristol bay
• Denali
• Dillingham
• Fairbanks north star
• Haines
• Hoonah-angoon
• Juneau
• Kenai peninsula
• Ketchikan gateway
• Kodiak island
• Kusilvak
• Lake and peninsula
• Matanuska-susitna
• Nome
• North slope
• Northwest arctic
• Petersburg
• Prince of wales-hyder
• Sitka
• Skagway
• Southeast fairbanks
• Valdez-cordova
• Wrangell
• Yakutat
• Yukon-koyukuk

Questions

What septic systems are allowed in Alaska?

landplan.io permits these system types in Alaska: 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 Alaska?

landplan.io sizes the septic tank in Alaska 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 Alaska?

Yes, for 4 of Alaska's 30 counties, and part of 8 more.