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Water · Infrastructure

Constructed-Wetland Wastewater Treatment

Two systems in service · Azerbaijan and IsraelCompleted

Real, planted high-performance septic: treating wastewater cleaner than local septic codes require in a fraction of a standard system’s footprint, and doubling as parkland.

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A constructed-wetland treatment pond in service, planted with water lilies and reeds
Above code
Wastewater treatment level
25–50%
Of a standard footprint
Since 2012
Earliest system still in service

The challenge

Communities that need on-site wastewater treatment without surrendering a large drainfield: the constraint that forces low density on lots with no municipal sewer.

Our approach

Engineered, planted constructed-wetland systems: a compact, lab-verified process that treats wastewater on-site and reads as landscape, not infrastructure. SeaTop delivers these systems with the specialist constructed-wetland company it works with, who built the two shown here — the same arrangement as the homes, which are precision-built off site in our partner factory. The Azerbaijan system has been in service since 2012; in Petach Tikva, Israel, a planted pond treats nitrate-polluted groundwater.

The outcome

Wastewater treated to a standard cleaner than local septic codes require, in a fraction of the usual footprint, freeing land for housing and turning the treatment system itself into a planted, usable park.

The planted edge of a constructed-wetland treatment pond
A finished treatment pond: the water is purified as it flows through the plants.
A constructed-wetland basin part-built, with the liner laid and gravel media going in
Mid-build: the basin lined, and the gravel media that the treatment plants root into going in.
A constructed-wetland pond at the earthworks stage, beginning to fill
Earthworks: the basin shaped and beginning to fill, before planting.
Close view of a constructed-wetland treatment cell being built
A treatment cell being built and lined.
A completed wetland treatment park seen from above
In service: the system reads as a park, not a treatment plant.
A planted treatment channel running alongside a white residential building
The same process at building scale — a planted channel taking a building’s wastewater.
A constructed wetland lake in a city, with apartment towers behind
At municipal scale, the treatment water becomes the amenity.
Systems used

The SeaTop systems behind it

High-Performance SepticLot Density Optimization
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