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How Onsite Sewage Management Systems Work

Onsite Sewage Management (OSSM) systems in New South Wales (NSW) are essential for treating and managing wastewater in areas not connected to centralized sewage systems. These systems treat and dispose of sewage on the property where it is generated. Here are some key points;

Types of Onsite Sewage Management Systems

  1. Septic Tanks: These systems use a tank to hold and partially treat wastewater. Solids settle to the bottom, and liquids are discharged to a land application system for further treatment and disposal.
  2. Aerated Wastewater Treatment Systems (AWTS): These systems use oxygen to promote bacterial activity that breaks down waste. They typically involve multiple chambers and produce higher quality effluent compared to septic tanks.
  3. Vermiculture Systems: Utilize worms and other natural processes to break down waste. They treat wastewater through biological digestion, producing a nutrient-rich liquid effluent that can be safely dispersed.
  4. Composting Toilets: These systems treat human waste by composting it with other organic materials, reducing it to a stable and relatively dry material.
  5. Greywater Systems: These systems treat and reuse water from baths, showers, and washing machines for irrigation or toilet flushing.

Maintaining Onsite Wastewater Systems

Servicing Aerated Wastewater Treatment Systems (AWTS)

  • Frequency: Service every 3 months by a qualified service agent. This includes cleaning/replacing filters, monitoring effluent quality, provision of chlorine and checking pump and switch operation​.

Routine Inspections and Pumping

  • Frequency: Inspect septic tanks annually and pump every 3-5 years, depending on usage, to prevent overflow and maintain efficiency​.

Preventing Problems

  • Water Usage: Use water-efficient appliances and avoid overloading the system by spreading out heavy water-use activities.
  • Proper Waste Disposal: Avoid disposing of harmful chemicals and non-biodegradable items in the system.
  • Stormwater Management: Ensure stormwater does not enter the system​.

Signs of Trouble

  • Indicators: Foul odours, slow drains, gurgling noises, water pooling in the disposal area.
  • Action: Address issues promptly, starting with an inspection by a plumber or a service agent.