What Are Ecology Blocks?
If you've driven past a construction site, mining operation, gravel yard, or industrial facility in Washington State, chances are you've seen ecology blocks — even if you didn't know what they were called.
Ecology blocks — sometimes called precast blocks, eco blocks, Lego blocks, or concrete bin blocks — are large precast concrete blocks typically manufactured in a trapezoidal or rectangular cross-section. They are designed to interlock with one another, allowing them to be stacked and arranged without mortar or fasteners.
Their self-aligning geometry means walls can be built quickly with basic equipment and without specialized labor.
Standard sizes in Washington State:
2 ft wide × 2 ft tall × 6 ft long (most common)
Smaller 2×2×2 blocks also available
Larger custom sizes offered by some manufacturers
Each standard block weighs approximately 3,500–4,000 pounds, making them stable enough to hold back significant loads without additional anchoring.
Why Are They Called “Ecology” Blocks?
The name comes from their environmentally friendly origins.
Ecology blocks were originally produced using waste concrete — leftover slurry, excess mix, and off-spec concrete from batch plants and ready-mix operations. Instead of sending this material to landfills, manufacturers pour it into block molds and let it cure.
The result: structurally sound, cost-effective blocks that keep waste out of landfills.
Even today, many ecology blocks are still made with returned or surplus concrete, making them one of the more sustainable precast products on the market.
How Are Ecology Blocks Made?
Ecology blocks are precast concrete products, manufactured off-site in a controlled facility and delivered ready to use. Here’s the process:
Molds are prepared — Heavy-duty steel forms (usually trapezoidal) are set on a flat casting surface for natural stability when stacked.
Concrete is poured — Fresh-batched or returned surplus mix is poured and consolidated to remove air voids.
Blocks cure — They cure in the mold, are stripped, and moved to a yard for final curing (full strength in 28 days).
Blocks are lifted — Each block has a cast-in lifting loop or recessed lift point, so forklifts or cranes can move them easily.
No on-site curing, no forms, no waiting — blocks are ready to install the moment they arrive.
Key Characteristics of Ecology Blocks
No mortar required — Interlocking shape + weight creates rock-solid stability
Fully relocatable — Take them apart and rebuild anywhere
Extremely durable — Resist weather, UV, freeze-thaw cycles, and most chemicals
Scalable — From one block to thousands for major structures
Fast installation — A two-person crew with a forklift can build a big wall in a day
Zero maintenance — Once placed, they last decades with zero upkeep
Common Names for Ecology Blocks
You might hear them called many different names depending on the region:
Eco blocks
Lego blocks (for their stacking style)
Concrete bin blocks
Precast bin blocks
Retaining wall blocks
Mafia blocks (regional slang)
In Washington State and the Pacific Northwest, “ecology blocks” and “eco blocks” are the most widely used terms.
Who Uses Ecology Blocks?
The applications are almost endless:
Contractors — Temporary walls, material segregation, site organization
Mining & aggregate operations — Stockpile containment and bin dividers
Municipalities — Flood control, erosion barriers, road closures
Farmers & ranchers — Feed bunkers, compost bins, livestock pens
Homeowners — Retaining walls, raised garden beds, property markers
Industrial facilities — Chemical containment and storage yards
In Washington State, the mix of booming construction, agriculture, ports, and challenging terrain has made ecology blocks a staple product across dozens of industries.
Washington Ecology Blocks: Your Local Source
At Washington Ecology Blocks, we supply high-quality precast concrete ecology blocks throughout Washington State.
Whether you need a few blocks for a backyard project or a full truckload for a major industrial site, we’ve got you covered. Standard and custom sizes available. Delivery statewide.
Contact us today to discuss your project and get a fast quote.