NPCA certified Septic & Wastewater
NPCA-certified septic tanks, pump and dosing chambers, interceptors, and advanced treatment systems from 500 to 10,000 gallons — for single homes, commercial sites, and everything between.
Tanks, chambers & treatment sized for the job.
NPCA-certified septic tanks, pump and dosing chambers, interceptors, and advanced treatment systems from 500 to 10,000 gallons — for single homes, commercial sites, and everything between.
Filter to your size
Filter by how the product will be used, search by size, and pull the drawing you need — no scrolling through an accordion.
28 products
500 Gallon Septic / Pump Chamber
500 gal- Compartments
- 1
- Dimensions
- 6'8" × 4'4" × 4'10"
- Load rating
- H-10
1000 Gallon Septic / Pump Chamber
1,000 gal- Compartments
- 2
- Dimensions
- 9'2" × 5'2" × 5'6"
- Load rating
- H-10 / H-20 opt.
1000/500 Gallon Septic / Pump Chamber
1,000 gal1000 / 500 Septic / Pump Chamber
1,500 gal- Compartments
- 2
- Dimensions
- 12'0" × 5'2" × 5'6"
- Load rating
- H-10 / H-20 opt.
1500/500 Gallon Septic / Pump Chamber
1,500 gal1500 / 500 Septic / Pump Chamber
2,000 gal- Compartments
- 2
- Dimensions
- 13'6" × 5'6" × 5'8"
- Load rating
- H-20 opt.
2500 Gallon 1650/850 Septic / Pump Chamber
2,500 gal- Compartments
- 2
- Dimensions
- 15'0" × 5'8" × 5'10"
- Load rating
- H-20 opt.
2000/1000 Gallon Septic / Pump Chamber
2,000 gal2000 / 1000 Septic / Pump Chamber
3,000 gal- Compartments
- 2
- Dimensions
- 17'2" × 5'10" × 6'0"
- Load rating
- H-20 opt.
1000/500 Siphon Tank
1,000 gal- Compartments
- 2
- Dimensions
- 12'0" × 5'2" × 5'6"
- Load rating
- H-10
1500/500 Siphon Tank
1,500 gal- Compartments
- 2
- Dimensions
- 13'6" × 5'6" × 5'8"
- Load rating
- H-10
1500 Gallon Septic
1,500 gal- Compartments
- 1
- Dimensions
- 11'0" × 5'6" × 5'6"
- Load rating
- H-10
1500 Gallon Low Profile Septic Tank
1,500 gal1500 Gallon Low-Profile Septic
1,500 gal- Compartments
- 1
- Dimensions
- 13'0" × 6'0" × 4'6"
- Load rating
- H-10
2000 Gallon Septic
2,000 gal- Compartments
- 1
- Dimensions
- 13'6" × 5'8" × 5'8"
- Load rating
- H-20 opt.
2500 Gallon Septic
2,500 gal- Compartments
- 1
- Dimensions
- 15'0" × 5'10" × 5'10"
- Load rating
- H-20 opt.
2500 Gallon Septic Tank
2,500 gal6000 Gallon Septic
6,000 gal- Compartments
- 2
- Dimensions
- 22'0" × 6'6" × 6'6"
- Load rating
- H-20
1000 Gallon Interceptor / Separator
1,000 gal- Compartments
- 2
- Dimensions
- 9'2" × 5'2" × 5'6"
- Load rating
- H-20 opt.
1000 Gallon Interceptor / Separator Tank
1,000 gal1500 Gallon Interceptor / Separator
1,500 gal- Compartments
- 2
- Dimensions
- 11'0" × 5'6" × 5'6"
- Load rating
- H-20 opt.
1500 Gallon Interceptor / Separator Tank
1,500 gal2000 Gallon Interceptor / Separator
2,000 gal- Compartments
- 3
- Dimensions
- 13'6" × 5'8" × 5'8"
- Load rating
- H-20 opt.
2000 Gallon Interceptor / Separator Tank
2,000 galAdvanTex Level 2 Treatment System
- Compartments
- 2
- Dimensions
- System — varies
- Load rating
- H-10
Pump Station Package
- Compartments
- 1
- Dimensions
- 6'8" × 4'4" × 5'10"
- Load rating
- H-10 / H-20 opt.
No sizes match those filters
Find the right system for your project
Every project is a little different. Start from how the product will be used — we’ll point you to the right sizes and options.
Residential Septic Systems
Right-sized tanks for 2–5 bedroom homes, gravity or pump-dosed.
Learn moreCommercial & Multi-Family
Higher-capacity systems for lodges, subdivisions & businesses.
Learn morePump & Dosing Chambers
Effluent dosing for pressure-distribution drain fields.
Learn moreGrease Interceptors & Separators
Oil, grit & grease separation for kitchens and shops.
Learn moreAdvanced Treatment (AdvanTex)
Level-2 treatment for tight lots and sensitive sites.
Learn moreSiphon Systems
Dose-and-rest distribution without moving parts.
Learn moreSeptic & Wastewater guides
Sizing, installation and specification, written by the people who pour the product.
Concrete Septic Tank Guide: Sizes, Cost, Lifespan, and Install
The complete concrete septic tank guide from a Montana precaster: real sizes, cost drivers, decades-long lifespan, install, design, and delivery.
Read the guideConcrete Septic Tank Sizes and Dimensions: 1000 and 1500 Gallon
Concrete septic tank sizes and dimensions from a Montana precaster: real 1000 and 1500 gallon measurements, sizing by bedrooms, and…
Read the guideHow to Install a Concrete Septic Tank: A Precaster’s Step-by-Step Guide
How to install a concrete septic tank the right way: a Montana precaster's guide to excavation, bedding, setting, pumped systems,…
Read the guideSeptic Tank Design: Sizing, Soil, and Drainfield Basics
A practical septic tank design guide from a Montana precaster: sizing by flow, soil and perc tests, drainfield design, pumped…
Read the guideConcrete vs Plastic Septic Tank: Which One Should You Choose?
Concrete vs plastic septic tank, compared fairly by a Montana precaster: lifespan, cost, strength, installation, and when a plastic tank…
Read the guideTraffic-Rated Septic Tank Systems: What They Are and When You Need One
What a traffic-rated septic tank is (HS-20), when you need one, and how commercial and communal septic systems get built,…
Read the guideDrawings & spec sheets
Pull the drawing you need for permitting, bidding, or install — no login, no gate.
Common questions
Straight answers from a team that has done this work for decades.
What size septic tank do I need?
As a rule of thumb: 2–3 bedrooms → 1,000 gal, 4 bedrooms → 1,250–1,500 gal, 5 bedrooms → 1,500–2,000 gal. Commercial flows are sized by design load — send us the details and we’ll spec it.
Single- or two-compartment?
Most modern installs use two compartments for better solids settling and effluent quality. Both are available, and many tanks double as effluent dosing chambers on larger systems.
Do you deliver and set the tank?
Yes. We run our own fleet of boom trucks and set tanks on grade across Montana, Northern Idaho, and Southern Alberta — no coordinating a third-party hauler for a 10,000-lb product.
Can your septic tanks be traffic-rated for drive-over?
Yes — any of our septic tanks can be built to the AASHTO HS-20 highway loading standard, with the tank and its lids reinforced to carry vehicle loads, not just the lid. Concrete, PVC, or fiberglass risers and lids are available either way. Tell us where a drive, parking area, or equipment path crosses the tank and we will spec the build. Our traffic-rated and commercial septic guide covers when you need one.
What permits do I need in Flathead County?
Every property needs a Land Research Request approval first, then county health-department review. Requirements vary by county — see the ordering steps or call us and we’ll point you to the right forms.
Talk to us about Septic & Wastewater
Tell us what you are building and we will point you to the right product, size, and lead time. No pressure, no bots.
(406) 752-7163Related products
Have a project in mind?
Send us the drawings, the dimensions, or just the idea. We will tell you what is possible, what it costs, and when we can set it.