• Storm drain grate secured with green webbing straps during under-grate inlet protection installation for stormwater sediment and debris control.
  • Black under-grate storm drain filter with green webbing straps, designed to capture sediment, debris, and pollutants from stormwater runoff and fold flat for storage.
  • Low-profile under-grate storm drain filter folded flat for compact storage, designed for quick installation, high visibility, and street sweeper-friendly stormwater inlet protection.

Under Grate Filter

Key Specs

  • Size: 24 in. to 60 in. Square (Custom Options Available.)
  • Fabric Material: 5,500 lb. Nylon Webbing, Filtration Fabric
  • Street Sweeper Safe

Overview

Grate Solutions help keep contaminants such as silt, trash, and debris out of stormwater runoff and drainage systems. They comply with local and federal stormwater regulations and reduce pollutants from entering storm drain systems. These products provide protection without the difficulty of removing heavy iron grates. Avoid the safety problems of intrusive high-profile products. Keep a low profile, easy installation, and don’t get in the way of vehicles or street sweepers using these quick connect systems.

  • Stops Sediment While Allowing Water to Flow.
  • Quick and Secure Installation.
  • Street Sweeper Safe.
  • Other Sizes Available Upon Request. Made to Order Based on Specific Grate Sizes.
  • Alternative Fabrics with Various AOS and Flow Rates Available.

OPTIONS & SPECIFICATIONS

Size 24 in. to 60 in. Square (Custom Options Available.)
Fabric Material 5,500 lb. Nylon Webbing, Filtration Fabric
Standard Filter Silt, Sand, Trash, and Debris
Includes Fabric, Top and Bottom Brackets, Heavy-Duty Fasteners
Installation Grate Removal Not Required, One Person Installation
Drain Shape Square or Rectangle Drains

MEDIA GALLERY

Workers installing an under-grate storm drain filter by slipping green webbing straps over the ends of a catch basin grate for stormwater inlet protection.
Forklift replacing a storm drain grate over an installed under-grate inlet protection filter secured with green webbing straps for stormwater sediment control.
Under-grate storm drain filter filled with leaves, sticks, and debris, demonstrating how the stormwater BMP captures pollutants before they enter a catch basin.

An under grate filter is a stormwater Best Management Practice (BMP) installed beneath a storm drain grate to capture sediment, debris, oils, chemicals, and other contaminants from runoff before they enter the stormwater drainage system. Because the filter sits below the grate, it provides stormwater filtration without creating a large surface obstruction.

An under grate filter sits below the storm drain grate and captures pollutants carried by stormwater runoff as water enters the drain. The filtration system allows stormwater to continue through the inlet while helping prevent sediment, debris, and other contaminants from traveling farther into the drainage system and surrounding waterways.

Under grate filters are a type of Stormwater Best Management Practice (BMP) used to protect storm drains and downstream water systems from pollutants carried by runoff. GEI Works groups Over/Under Grate Filters with its Stormwater BMP filtration solutions.

Enviro-USA’s™ Under Grate Filter is designed to capture sediment, silt, sand, debris, oils, chemicals, and other contaminants from stormwater runoff. The pollutants captured will depend on the filter configuration, site conditions, and contaminants present in the runoff.

Under grate filters can be used wherever storm drains require protection from sediment and pollutants, including construction sites, parking lots, roadways, industrial facilities, commercial properties, residential developments, and other stormwater drainage areas. Their below-grate installation makes them particularly useful where surface traffic is a concern.

  • Construction sites are a strong application for under grate storm drain filters because disturbed soil can produce sediment-laden runoff during rain events. An under grate filter provides secondary protection at the drain inlet when sediment or debris gets past upstream erosion and sediment controls.
  • Under grate filters are well suited for storm drains in parking lots where runoff can carry sediment, trash, debris, oils, and other pollutants. Their below-grate design also makes them a useful alternative when traffic makes an over-grate filtration system less desirable.
  • Under grate filtration may be appropriate for roadway storm drains when the drain configuration and project specifications allow it. The below-grate design keeps the primary filtration system out of the direct traffic area, which can make it advantageous for certain high-traffic applications.
  • Industrial facilities can use under grate filtration as part of a broader stormwater-management program to capture sediment, debris, oils, chemicals, and other contaminants before they enter the drainage system. Filter selection should be based on the pollutants expected at the facility.

An under grate filter is installed beneath the storm drain grate, providing discreet filtration that is particularly useful in higher-traffic areas. An over grate filter sits directly on top of the grate, providing easier surface access and installation without removing the grate. Both are designed to help prevent sediment and pollutants from entering stormwater systems.

Consider an under grate filter when traffic, surface accessibility, or appearance makes a surface-mounted filter less desirable. Enviro-USA’s™ under grate filters are a discreet solution and recommended for high-traffic construction areas. Over grate filters may be preferable when quick surface installation, inspection, and removal are priorities.