

ABOUT NORTHWEST
CONCRETE
Since being purchased in 1962 by the Mooney family, Northwest Concrete Products and Ornamental Iron has been supplying the Storm Lake and surrounding areas with quality precast concrete steps and septic tanks. Northwest Concrete also offers concrete grease traps, well pit sections, pump pits, well covers and much more! We make all of our concrete products at our plant in Storm Lake, Iowa. It means when you buy from Northwest Concrete, you are buying a quality product from a business you can trust. For more information about all of our quality precast concrete products, call our office today!
Concrete Products
Northwest Concrete manufactures high quality precast concrete products to sell to our customers. Keep scrolling to browse some of our inventory or call our office today to find out more!
Well Pits
Length: 6ft 6in
Width: 4ft 6in
Total Height: 6ft 4in
![]() Square Well Sections | ![]() Square Well Sections |
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Our concrete Well Pits are rectangle design, and have the option of a poured floor for the bottom section. They are typically sold as a three piece unit which includes the 3 well wall sections, a lid, and a concrete man hole access cover.
Pump Pits
Length: 42in
Width: 42in
Depth to Pipe: 29in
![]() 100 Gallon Pump Pit | ![]() 100 Gallon Pump Pit |
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Northwest offers 100 gallon concrete Pump Pits for lift stations. These lift stations are compact and durable, and equipped with the same 18 inch
man hole access covers as our septic tanks.
Other Concrete Products
![]() Hex Stepping Stones | ![]() Hog Pans | ![]() Small Well Covers |
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![]() Parking Curbs-Yellow | ![]() Large Gas Block |
Northwest Concrete offers a variety of non plumbing precast products as well. From stepping stones and parking curbs to well covers and splash blocks, call our office today to see what we have for you!

Concrete Product Sizes:
Our office is happy to answer any questions you may have about our precast products.
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Most of the products listed in this section can be picked up with a pick up truck or with a small trailer.
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Please call if you have any questions on pick ups or deliveries.
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Air Conditioner Base Slabs:
Length: 24in Width: 24in Height: 3in
Length: 30in Width: 32in Height: 3in
Length: 30in Width: 40in Height: 3in
Length: 36in Width: 36in Height: 3in
Length: 24in Width: 36in Height: 2in
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LP Gas Block:
Length: 28in Width: 8in Height: 3in
Length: 32in Width: 12in Height: 3in
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Parking Curbs:
6ft Plastic Coated
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Round Lid:
6ft Diameter
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Splash Block:
Length: 36in Width: 11in Height: 3in
Length: 24in Width: 12in Height: 3in
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Stepping Stones:
12in by 12in Square
16in Hexagon Shape
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Well Covers:
Diameter of Available Sizes in Inches: 24 , 28 , 30 , 34 , 36 , 42 , 48
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Memorial Slabs:
Length: 28in - 78in @ 22in Wide
Including: 22in X 36in Military
Length: 42in, 60in, 66in @ 26in Wide
Concrete Septic Tanks
Northwest Concrete offers a range of tank sizes and styles to accommodate most needs. From our 1000 gallon tanks up to our 2000 gallon tank, with 3 inch walls and insulated lids, we have a tank for you. Including our 15-5 tank, a one piece 1500 gallon tank with a 500 gallon pump section! We also offer AdvanceTex style tanks, Roth Plastic tanks, and the Ecoflo Coco Filter System. Northwest Concrete is ready to deliver our products to anywhere in the surrounding area up to 150 miles. Please call if you have any questions or would like to schedule a delivery.
* MEASUREMENTS ARE ACTUAL TANK SIZE*
1000 Gallon Concrete Septic Tanks
Length: 9ft
Width: 5ft 8in
Depth to Inlet Pipe: 47in

Our 1000gal Concrete Septic Tanks are available in 2 compartment, Single Compartment, and Grease Trap configurations.
1250 Gallon Concrete Septic Tanks
Length: 11ft 6in
Width: 5ft 8in
Depth to Inlet Pipe: 45in

Our 1250gal Concrete Septic Tanks are available in Single and 2 Compartment configurations.
1500 Gallon Concrete Septic Tanks
Length: 11ft 6in
Width: 5ft 8in
Depth to Inlet Pipe: 53in

Our 1500gal Concrete Septic Tanks are available in Single, 2 Compartment, and AdvanceTex configurations.
2000 Gallon Concrete Septic Tanks *
Length: 13ft
Width: 6ft 6in
Depth to Inlet Pipe: 58in

Our 2000gal Concrete Septic Tanks are available in Single Compartment and 2 Compartment configurations.
1500-500 Septic Tank with Pump (15-5)*
Length: 13ft
Width: 6ft 6in
Depth to Inlet Pipe: 58in

The 15-5 Concrete Septic Tank is a single unit, 1500 gallon septic tank with a 500 gallon pump chamber all in one. Give Northwest Concrete a call today to order any one of our quality tanks!
*For 2000 gallon and 15-5 tanks, please call for additional information*
More Options
Northwest Concrete is proud to offer the best products in the business. Call our office to find out more about the Ecoflo Coco Bio-Filter system by Premier Tech, or one of the Roth (RMT) Plastic Tanks we keep on hand. No matter the problem, Northwest Concrete has the solution.
EcoFlo Bio-Filter

Ecoflo Coco Bio-Filters eliminate the need for long runs of drainfield and offer an option where space is an issue. Each Ecoflo comes with a 10 year Shell warranty, 10 year Media warranty, a 2 year parts and labor warranty for pump, floats, and alarm boxes if equipped. Also, the first years maintenance is FREE! Call Northwest Concrete for more information or check out their website by clicking the link below.
Length: 11ft 6in
Width: 4ft 2in
Depth to Inlet: 49in
Roth (RMT) Plastic Tanks

Northwest Concrete also carries Roth Plastic Tanks in 1250gal and 1500gal sizes, for the places that just can't be accommodated with a concrete tank. Certified by the state of Iowa, Roth tanks are some of the best in the business. Each Roth tank comes with a lifetime corrosion protection plan and 5 years of labor insurance coverage. And they can be buried with up to 6 feet of cover! Call our office for more information or check out their website by clicking the link below.
RMT-1250 Gallon 2 Compartment:
Length: 12ft 4in
Width: 5ft 2in
Height: 4ft 3in
RMT-1500 Gallon 2 Compartment:
Length: 14ft 8in
Width: 5ft 2 in
Height: 4ft 3 in
Drainfield

Northwest Concrete offers ADS 18 inch wide Drainfield, and ADS 36 inch wide Low Profile Drainfield. Both sizes are sold in 5 foot long pieces that lock together on the ends. The 18 inch wide is compact and arched tall for strength, while the 36 inch wide are ribbed down the low profile center for strength over a lower, wider area. Northwest Concrete offers 7 and 9 hole distribution boxes with gaskets, plugs, and speed levelers on hand.
18 Inch Drainfield:
Length: 5ft
Width: 18in
Height: 12in
36 Inch Drainfield:
Length: 5ft
Width: 36in
Height: 8in
Riser Pipe

Northwest Concrete carries ADS Dual Wall Pipe for our system riser pipe. We sell it in 10 foot lengths, at 18 inch and 24 inch inside diameters. The Dual Wall fits both our septic tank and pump station lid adapters.
Tank Trucks
3 Trucks dedicated to delivering your septic systems. Call today to schedule your delivery!
![]() Combo Load | ![]() 3 Trucks Ready To Go | ![]() Fully Loaded |
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![]() Well Sections Being Delivered | ![]() Double Loaded | ![]() 3 Chamber 1500 Gallon Tank with 500 Pump Pit |
![]() Setting a 1500 |
Setting A Tank
Northwest Concrete uses straight boom delivery trucks. We back our trucks to the end or the side of the hole to set your tank, and with a swivel hook on our lift system, the tank can be spun 360 degrees to find your needed set angle.
![]() Setting a 1500 | ![]() Setting a 1500 | ![]() Setting a 1500 |
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![]() Setting a 1500 | ![]() Setting a 1500 |


Get In Touch With Us
Open: Monday - Friday 7am - 5pm
Toll Free: 1-800-798-0001
6134 US-71
Storm Lake, Buena Vista County
Iowa 50588
USA
1-712-732-1885 Phone
1-712-732-3651 Fax