Why You Should Upgrade Your Septic System (Especially If It’s 20+ Years Old or You’re Building a Granny Flat)

Why Septic System Upgrades Matter on the Sunshine Coast

If your home in Pomona or the surrounding Hinterland is still running on a septic system that’s 20 years old or more, chances are it’s overdue for an upgrade. Older systems often weren’t designed to handle today’s water usage, modern household appliances, or the increased load that comes with additional buildings like granny flats, studios, or sheds with bathrooms.

A well-functioning septic system is vital for protecting your property, your health, and the environment — and upgrading can save you from costly repairs and council compliance issues down the track.

1. Your System Must Comply When Adding a Granny Flat or Shed

If you’re planning to add a granny flat, secondary dwelling, or shed with plumbing, your septic system must be assessed to ensure it can cope with the extra wastewater load.

Most older systems simply can’t. Councils across the Sunshine Coast require that wastewater systems meet modern standards before any additional plumbing can be approved.

If your system is 20+ years old, expect:

• A mandatory assessment (if you are undergoing a seperate plumbing application)

• Capacity upgrades or a full replacement

• Council application and approval steps

Our team can handle this entire process for you — from inspections to design, installation, and certification.

2. Improved Performance & Better Environmental Outcomes

Upgrading your septic system means cleaner, safer wastewater disposal. Modern systems offer:

• More efficient treatment

• Reduced risk of groundwater contamination

• Fewer odours and blockages

• Longer system life

This keeps your backyard cleaner and safer, especially important if you’ve got kids, pets, or a secondary dwelling nearby.

3. Avoid Costly Breakdowns and Failures

Once a septic system hits the 20–25 year mark, wear and tear becomes unavoidable. Common issues include:

• Blocked drainage trenches

• Overflowing tanks

• Tree-root infiltration

• Structural tank damage

• Surface pooling or soggy areas

These problems only get worse with increased usage. An upgrade now can prevent emergency callouts, environmental fines, and expensive property damage.

4. Modern Systems Are More Efficient and Lower Maintenance

Older septic systems can’t compete with the efficiency of today’s wastewater treatment units. New systems offer:

• Lower running costs

• Reduced maintenance requirements

• Smart controllers and alarms

• More reliable pumps and aerators

• Better treatment quality

If you’re investing in extra accommodation like a granny flat, upgrading your system ensures everything runs smoothly for years to come.

5. Protect Your Property Value

Properties with modern, compliant wastewater systems are worth more. Buyers and tenants expect hygienic, low-maintenance, environmentally responsible wastewater solutions.

If you’re adding a secondary dwelling to rent out or host family, a compliant septic system is essential.

Need to Upgrade? We Can Help.

At Plumbing & Gas Services Pomona, we specialise in septic inspections, upgrades, repairs, and replacement systems for rural and semi-rural homes across Pomona and the Noosa Hinterland.

We can assist with:

• System assessments

• Council applications

• Drain field upgrades

• New septic or treatment plant installations

• Plumbing for granny flats, studios, and sheds

Ready to Get Started?

If your septic system is over 20 years old — or you’re planning to build a granny flat — now is the perfect time to upgrade.

Contact Plumbing & Gas Services Pomona for expert advice and a competitive quote.