LID Urban Design Tools - Tree Box Filters

Filterra™ system concrete box prior to installation
(Source: Americast, Inc.)

Cost Guide ¹

Here is a sample cost estimate for a single-unit tree box filter (Filterra™ Stormwater Bioretention Filtration System).

*ITEM*	*COST*
Single-unit tree box filter: includes two years of maintenance and filter material and plants.	$6,000 per unit per 1/4 acre of impervious surface
TOTAL ESTIMATED COST:	$24,000 per acre

Additional costs:
Installation: varies with each site; generally the same as a precast inlet structure.	$1500 per unit
Annual maintenance: (negotiable and varies for each application)
● Performed by the Manufacturer	$500 per unit (less for multiple units)
● Performed by the Owner	$100 per unit