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Drain Warden

a man is trimming away the excess material from a drain warden installed in a drain pit

The unique design of the Drain Warden operates in a similar fashion to a gross pollutant trap. Once installed it will prevent contaminants from entering the stormwater system while still allowing water to flow through. It captures coarse sediments and debris from runoff. When accompanied by the absorbent bilge boom, this device effectively removes hydrocarbons, oils and fuels as well.

How the Drain Warden works

The Drain Warden is made from fabric. The polypropylene nonwoven geotextile fabric is the filter medium – any particulate greater than 90 microns will be trapped by the fabric. A polypropylene absorbent mini boom in the basin of the Drain Warden traps hydrocarbons, oils and fuels.

Runoff water entering the drain will tend to ‘swirl’ inside the drain warden, with hydrocarbons attracted to the hydrophobic boom suspended beneath the grate. Particulates greater than the pore size of the fabric will be captured. The Drain Warden also has overflow pockets to facilitate large volume flows during heavy rain.


Ideal for use where leaf litter, rubbish, coarse sediment, surface oil and grease can be carried into the stormwater drains:

  • Car parks
  • Delivery docks
  • Service areas
  • Industrial plants

How to install a Drain Warden

Installation is very simple. It sits in the pit beneath the drain grate. The grate holds the device in place. If the absorbent boom is being installed to capture hydrocarbons, it easily ties onto the grate and hangs down inside the Drain Warden.

note: Because the Drain Warden will stop silt and sediment, it may not be the best option in construction areas. Consider the Silt Warden instead.


Once installed this inlet protection device and the pit itself should both be inspected on a regular basis and after rain events. The absorbent boom can be easily replaced as required. Once the Drain Warden has reached capacity it can be removed. Depending on the amount of debris that’s been captured, lifting equipment such as a forklift may be required lift out the filled warden. It should then be responsibly disposed of according to local regulations.

Drain WArden


Product Information
1.3mW x 1.3mL
600mm deep
260gsm non woven geotextile
90 micron pore size
Flow rate 80L/m2/sec

Drain Warden with Absorbent Boom


Absorbent Boom:
2L hydrocarbon capacity
125mm Dia x 300mmL
Retrieval cord

Australian Made. specialised fabrication.

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