Building & Development
Water & Sewer Connections

Pressure Sewer Systems

Pressure sewer systems are small on-property units that collect, grind and pump household sewage into a pressurised reticulation system in the street which then conveys the household sewage on to a treatment plant.

sewer diagram The pressure sewer unit and other components are maintained by Shoalhaven Water

Pressure sewerage systems are not common across the city but generally in areas where a conventional gravity system is not a viable servicing option such as flat or rocky terrain.

The pressure sewer unit and all relating components are owned and maintained by Shoalhaven Water in their entirety. At no times are the pressure sewer units or other components to be adjusted, serviced or relocated by any persons other than Shoalhaven Water operations staff. Shoalhaven Water has a response framework to ensure that systems are maintained and operated effectively without detriment to the property, environment or surrounds. 

A development that is identified as requiring the installation of a low-pressure sewer unit (PSU) or any proposed work to an existing PSU must lodge an application with Shoalhaven Water prior to commencement of any works, this will include installation, modification or relocation of works. 

How to have a PSU installed:

Step One – Submit the Pressure Sewer Pump Unit Application  

Your application will require you to attach a plan showing the location of the proposed pressure sewer unit including the alarm/control panel, pressure service lines, power supply, meter box and power lines from the meter to the alarm panel and pressure sewer unit in relation to the Lot and proposed residence.

A Site Location Plan is required to be submitted as part of the installation request. A guide for the location plan is:

  • The pressure sewer unit must be located so that the residence and any other building can fully drain by gravity to the unit.
  • The pressure sewer unit must be located no closer than 5 metres to the residence. 
  • The pressure sewer unit and the alarm panel must not be more than 10 metres apart.
  • The pressure sewer unit must be in direct line of site from the alarm/control panel. No obstructions are permitted between the unit and the control panel.

Step Two – Given approval, a payment advice will be issued (where required)

Charges include the current market price of the required unit plus any additional costs for site works such as design, difficult terrain (ie rock conditions) or any additional work. A payment advice will be issued prior to installation.

Step Three - Installation of the pressure sewer system

The full installation of a pressure sewer unit will occur within approximately 8 weeks from the time an application is made. Planning by customers or developers well ahead is recommended. Once an installation is approved and payment received, Shoalhaven Water will install the pressure sewer unit in accordance to the Site Location Plan supplied. 

Electrical installation responsibility

Shoalhaven Water will install the control panel, connect the supply to the pumps and test electrical operation at completion of installation. It is the responsibility of the owner/builder to arrange for a qualified electrician to install a separate dedicated circuit (as specified below) from the electrical meter box to the location of the control panel. 

NOTE: Once connected and operating, all power costs for the running of the pressure sewer unit are the responsibility of the property owner. 

System installation requirements for electricians:

  • Single Pump Unit (Simplex) - supply to be 240 volt from a dedicated circuit using a 'D' curve 20A circuit breaker, conduit to control panel to be a minimum 25mm heavy-duty.
  • Dual Pump Unit (Duplex) - Supply to be 240 volt from a dedicated circuit using a 'D' curve 32A circuit breaker, conduit to control panel to be a minimum 50mm heavy-duty.

Control panel mounting location requirements:

  • Supply shall be taken to a point 150mm below the mounting location of the control panel and have at least 1 metre of cable left available for connection of panel.
  • The bottom of the panel must be 1200mm from ground level.
  • The panel must be mounted on wall, permanent structure or a minimum 200x100 galvanised post to a height of 1500mm above ground level.
  • Panel mounting location is to be no further than 10 metres from the tank.
  • Control panel must be accessible for maintenance and repair work to be undertaken by Shoalhaven Water.