Modular Wetlands’ Modular Wetlands System Linear (MWS Linear) has been approved by the City of Portland as laid out in the Appendix B: Submission Guidelines for Manufactured Stormwater Treatment Technologies.

The approval is based upon findings from Portland State University, a third-party reviewer of water quality monitoring and performance data. The MWS Linear has been deemed to meet the pollution reduction requirements of the 2014 Stormwater Management Manual (SWMM).


The MWS Linear is the most efficient and versatile biofiltration system on the market, and the only stormwater biofilter using horizontal flow which improves performance, reduces footprint, and minimizes maintenance.