Stormwater and Grey Water Pump Stations
Water collects at the low point whether the site was designed for it or not. A stormwater pump station clears it, moving surface water and grey water up to the legal point of discharge when there is no fall to work with.
Stormwater and Grey Water Pump Station Range
Three sizes. One-piece polyethylene chamber. Certified to AS/NZS 1546.1. The pump, valves, pipework and high-level alarm are fitted and tested before it arrives, so the install is a matter of connecting three things and backfilling.
The right one comes down to inlet depth and how much water you need to hold between pump cycles during a downpour.
| Code | Product | Capacity | Diameter (mm) | Height (mm) | ||
|---|---|---|---|---|---|---|
 | PS700-STM | 700L Pump Station (Storm / Grey Water) | 700L | 1090 | 1650 | |
 | PS1000-STM | 1,000L Pump Station (Storm / Grey Water) | 1,000L | 1092 | 2030 | |
 | PS1300-STM | 1,300L Pump Station (Storm / Grey Water) | 1,300L | 1094 | 2420 |
700L Pump Station (Storm / Grey Water)
PS700-STM
1,000L Pump Station (Storm / Grey Water)
PS1000-STM
1,300L Pump Station (Storm / Grey Water)
PS1300-STM
For pricing, Call us on 1800 062 064 or request a quote.
We will get you a price from your nearest stockist.
WHAT YOU GET
It Arrives Ready to Connect
Everything inside the chamber is fitted and tested before it leaves our manufacturing facility. There is no internal plumbing to build in a wet hole.
- Pump, fitted and tested. Matched to stormwater and grey water duty and installed at the factory.
- Brass ball valve. For isolating the discharge line without draining the chamber.
- Swing check valve. Stops water running back into the chamber once the pump shuts off.
- PVC barrel union. The pump lifts out through it, so servicing never means reaching into the liquid.
- 40mm brass discharge outlet. Fitted with a 40mm poly pipe connector, ready for the rising main.
- High-level alarm on a pre-installed stand. Visual and audible, with an outdoor power point for the electrical connection.
- Lifting lugs. Moulded in, so a mini excavator can place it.
- 500kg rated lid. Rated for pedestrian loading.
BUILT FOR STORMWATER DUTY
Built to Pass Grit and Debris
This is what separates the stormwater configuration from the sewer one, and it is worth understanding before you order.
Stormwater is cleaner than sewage, but it is not clean. It arrives with grit, sand, leaf litter and whatever else has been sitting on the surface since the last rain, and the first flush after a dry spell brings the worst of it. A pump that lets solids settle will jam. The stormwater configuration uses a vortex pump, which keeps material suspended and moving so it passes through the discharge line instead of collecting in the bottom of the chamber.
The chamber itself is moulded as one piece, so there are no seams to leak and nothing to corrode when it spends its life full of wet grit.
WHERE THEY GO IN
Where Stormwater Pump Stations Are Used
Car Parks and Hardstand
Basement and at-grade car parks collect a lot of water fast and usually sit below the drainage network. A pump station clears the low point before it becomes somebody standing in it.
Large Roof Catchments
Warehouses, sheds and commercial buildings shed a big volume in a short burst. Where the downpipe network cannot reach the street drain by gravity, the flow gets pumped.
Industrial Yards and Washdown Areas
Yards, wash bays and hardstand where surface water and washdown water have to be cleared through the working day, not just after rain.
Low-Lying Properties
Blocks that sit below the street, or with a fall running the wrong way, where surface water has nowhere to go on its own.
Grey Water Transfer
Laundry and bathroom grey water, sometimes called sullage in older council documentation, lifted to a treatment system or a legal discharge point where gravity will not get it there.
GETTING THE SPEC RIGHT
How to Size a Stormwater Pump Station
Sizing a stormwater station is a different exercise to sizing a sewer one. Sewage arrives at a fairly predictable rate. Stormwater arrives all at once.
- Catchment area. The total roof and paved area draining to the pit, in square metres. This is the number everything else works from.
- Design rainfall intensity. The storm event the system has to cope with, taken from the local council or water authority requirement rather than assumed.
- Peak flow rate. Catchment area and rainfall intensity together give you the flow the pump has to clear.
- Head and run length. How high and how far to the discharge point. Both set the pump duty required.
- Working volume. Enough storage between start and stop levels to absorb the peak without the pump short cycling. This is where chamber size is decided.
- Discharge conditions. Where it can legally discharge to, and whether council has conditions on the rate of release.
On anything commercial, the hydraulic consultant will usually have run these numbers already. Send us the flow and the head and we will confirm whether the duty suits.
HOW IT FITS THE SITE
Does a Pump Station Replace an On-Site Detention Tank?
No, and this catches people out. They do different jobs.
An on-site detention tank holds stormwater back and releases it slowly, so the development does not overload the street drainage during a storm. Councils impose it as a planning condition. A pump station moves water uphill when there is no fall. One controls the rate of release. The other provides the lift.
Plenty of sites need both. If your development has a detention condition on it and the discharge point sits above the collection point, you will be installing a detention tank and a pump station, not choosing between them.
ON SITE
Installing a Stormwater Pump Station
The short version. Excavate, bed it, drop it in, connect three things, backfill.
Excavation
To the depth in the installation guide for the chamber size, with a clean base.
Bedding
A compacted layer of sand or crusher dust for a level seat.
Placement
Lifting lugs are moulded in. A mini excavator handles it, so there is no crane and no concrete surround on a standard install.
Connections
Inlet at the correct fall, 40mm outlet to the rising main, and power to the pump and alarm.
Backfill
Granular material in compacted layers. The ribbed profile anchors into it and resists uplift.
Worth thinking about on stormwater specifically. These pits often go into the lowest, wettest part of the site, which is exactly where a poly chamber will try to float if it is not backfilled properly. Follow the anchoring detail in the installation guide.
A licensed plumber and a licensed electrician are needed for the install. Requirements vary by council and state regulator.
Certification and Warranty
- AS/NZS 1546.1. Certified to the Australian and New Zealand standard for on-site domestic wastewater treatment units.
- Australian made. Moulded and assembled in Swan Hill, Victoria.
- 10-year warranty on the chamber. Covering the one-piece polyethylene vessel.
Highest Quality and Standards
Every Polymaster pump station is certified to the Australian standard for on-site wastewater, moulded as one piece, and made here. Here is what stands behind it.
10-Year Warranty
The polyethylene chamber is backed by a 10-year Polymaster warranty.
ISO 9001 Quality Management
Polymaster holds ISO 9001 certification, the international standard for quality management systems.
Independently Certified
Certified to AS/NZS 4766:2006 for polyethylene storage tanks.
Send Us the Flow and the Head
Tell us the catchment, the levels and where it has to discharge to. We will confirm the chamber size and the duty before you order, so the first install is the only one.
Reliability for every drop.
RELATED PRODUCTS
Other Wastewater and Stormwater Solutions
Pump stations are one part of the underground wastewater range. The rest of it is built the same way.
Sewage and Black Water Pump Stations
The same chamber with a pump built to handle solids. For basements, commercial fit-outs and anywhere sewage has to be lifted to the main.
View Range
Septic Tanks
Low-profile poly septic tanks in 3,100L and 4,550L, with the inlet, outlet and baffle already fitted. For properties with no sewer to connect to.
View Range
Retention and Detention Tanks
For sites with a council detention condition, holding stormwater back and releasing it at a controlled rate.
View Range
FAQs
Stormwater Pump Station FAQs
Can I use a stormwater pump station for sewage?
No. It is not built to handle solids and putting sewage through it will block the discharge line. If you are moving sewage or black water, use the sewer configuration. The chamber is the same, the pump is not.
Will grit and leaves block it?
That is the situation the stormwater configuration is designed for. Material stays suspended and passes through rather than settling in the bottom of the chamber. A leaf guard or silt pit upstream still helps on a heavily treed catchment and will extend the service interval.
Where can it discharge to?
To the legal point of discharge for the property, which the council or water authority determines. It is not a decision made on site. Confirm it before you set the levels, because it drives the head and therefore the pump duty.
What size catchment will it handle?
It depends on the catchment area, the design rainfall intensity for your area, and the head to the discharge point. Send us the flow rate and the head and we will confirm whether the duty suits, or talk to us at the design stage.
What happens during a power cut?
The pump stops and the chamber holds what comes in until power returns. In a storm, that is a real consideration, because the inflow is at its highest exactly when the outage is most likely. The PS range is single pump, so on critical sites talk to us at the design stage about a pump well with duty and standby instead.
Can it go under a car park or driveway?
The standard lid is rated to 500kg, which is pedestrian loading. Anything carrying vehicles needs a heavier lid class. Given how often these go into car parks, talk to us about the loading before you set the location.
How often does it need servicing?
It depends on what the catchment brings in. A clean roof catchment needs less attention than an industrial yard. Check the pump, the float switches and the bottom of the chamber on a regular schedule, and more often after a heavy season. The pump lifts out through the barrel union without anyone entering the chamber.