In the seven years that the Silva Cell has been on the market, a number of cities have designated it as an approved technology for their sustainability goals, whether for tree growth, on-site stormwater management, or both. Here is a list of all the places, organized by state/province, that include it in their policies.

Alberta:

Calgary, AB Residential Street Design Policy
Edmonton, AB Low Impact Development Best Management Practices Design Guide

British Columbia:

Burnaby, BC Metrotown Development Area
Langley, BC (approved for general use to meet required soil volumes)
North Vancouver, BC – Lower Lonsdale Development Area
Vancouver, BC – South East False Creek Development Area

Ontario:

Kitchener, ON Development Manual
Markham, ON Streetscape Manual
Toronto, ON City of Toronto Urban Design Streetscape Manual
York Region, ON (approved for general use to meet required soil volumes)

Manitoba:

Winnipeg, MB Tree Planting Specifications & Details (Downtown Area and Regional Streets)

Maryland:

Montgomery County, MD (as a stormwater BMP)

Missouri:

St. Louis, MO Metropolitan Sewer District

Texas:

Mesquite, TX Landscape and Tree Preservation Ordinance

Washington:

Washington State Department of Ecology (designated as functionally equivalent to bioretention)
* the modeling procedure can be found here

Top image Flickr credit: D. Reichardt