Stormwater Management - The Basics

Norcal Ag Service’s 'Filter Green' certified Biotreatment Soil Mix (BSM) is made to the specifications you need for your job. Fitler Green is the only Bioretention soil made with sub angular Glacial sand from private deposit in North America offering unsurpassed structure, effectiveness and longevity to filtration basins.

Norcal Ag Service is dedicated to making quality Biotreatment Soil Mix (BSM) (biosoil) to the specifications you need for your job.  We have extensive experience in helping organizations engineer the soils they need to meet the wide variety of specifications for these projects.
Our custom-blended Bioretention soils remove pollutants through filtration and a variety of biological and physical processes. Our soils meet Bay Area Stormwater Management Agencies (BASMA) soil specifications for  Bioretention Soil media. They also meet USDA Soil Type requirements. Tested for Storm Water Infiltration Rate.

where to buy bioretention soil media

Engineered Soils, Bioswale, Bioretention Soil Media

Biotreatment | Bioretention | BioSwale

Norcal Ag Service provides biotreatment soil and class II permeable base rock for bioretention basins. (bulk by the truckload)

1.  Norcal Filter Green - BASMAA certified stormwater biofiltration soil media. 

2.  Class ll permeable rock - Caltrans Spec.

Biotreatment Soil Media (BSM) (biosoil) is a critical element of the bioretention system. Norcal Filter Green biosoil has a ratio of inorganic and organic materials that allows the appropriate infiltration rates for stormwater pollutant removal through chemical, biological and physical processes; and provide a sufficient growing medium for plants. 

Call Today for delivery pricing.


Norcal Ag Service 

Bioretention Basin

Bioretention soil media orders are delivered by regular semi's or high side transfers when needed. Orders are processed within 24 hours of receipt.
Call us today for product pricing delivered to your location(s) (925) 822-5364

Serving all of central and northern California

​Biotreatment Soil Mix

Top rated

Premium Certified Bio Treatment soil  constructed with specialized Glacial sub angular sand.