Performance Solutions for On-site Sewage Facilities

When the standard design doesn’t fit—there’s another way

If you’re installing an on-site sewage facility in the Fraser Coast region, your design usually needs to follow the Queensland Plumbing and Wastewater Code and Australian Standard 1547:2012. 

But what if your project doesn’t quite fit the “standard box”? That’s where a performance solution comes in. 

What the Code Normally Requires

Your sewage facility design should meet: 

If your project can’t meet these exactly, you’ll need to propose an alternative approach—one that still meets the intent of the rules. That’s your performance solution. 

What Is a Performance Solution?

A performance solution is a custom design that proves it can meet or exceed the safety, health, and environmental outcomes required by law—even if it’s different from the standard approach. 

It must show compliance with: 

What to Include in Your Application

When submitting a performance solution, your application will be assessed under Part 5 of the Plumbing and Drainage Regulation 2019

You’ll need to provide: 

  • What performance requirements apply 
  • How your solution differs from the standard 
  • The method used to prove compliance 
  • Evidence, expert judgment, and details of the competent person 
  • Any relevant codes, standards, technical data, or assessments 
  • Site and soil evaluations, design flow details, risk assessments, installation plans 
  • Test results, drawings, and certification documents 

Who Can Prepare a Performance Solution?

The person preparing your performance solution report must be suitably qualified. This includes anyone who holds: 

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