Is it time to replace your irrigation field?

For many homeowners with septic systems, the irrigation field (also called a drainage or soakage field) is very much “out of sight, out of mind” – and that’s usually a good thing. But when it begins to fail, the signs can be messy, smelly and expensive. In worst-case scenarios, it can even damage your pump.

What does an irrigation field actually do?

After solids settle in your septic tank, the remaining liquid effluent flows out to the irrigation field. It is distributed through perforated pipes into the surrounding soil, where natural filtration processes remove harmful bacteria and nutrients before the treated water returns safely to the groundwater system.

Over time, irrigation fields can clog, compact or simply wear out. When that happens, wastewater can no longer disperse properly.

Common signs you may need a replacement

1. Slow drains and gurgling pipes: If sinks, showers and toilets are draining slowly – and your septic tank has already been pumped – the issue may lie in the irrigation field. Gurgling sounds can indicate wastewater isn’t moving through the system as it should.

2. Wet or soggy patches on your lawn: Persistently damp ground above the irrigation area, especially during dry weather, is a clear warning sign. If the soil can’t absorb the effluent, it may start surfacing.

3. Unpleasant odours outside: A healthy system shouldn’t smell. If you notice sewage odours around your yard, particularly near the irrigation field, it’s time to investigate.

4. The system is ageing or under stress: Irrigation fields last around seven years, depending on soil type, use and maintenance. Livestock compacting the ground or roots from nearby plants can all cause damage.

5. Alarms or warning lights: If your alarm keeps sounding or a red warning light activates when you flush the toilet or run appliances, act quickly. Your system is struggling to cope.

Don’t wait for an emergency

Irrigation field problems rarely fix themselves. Acting early can prevent wastewater backing up into your home or causing major damage to your property or pump.

If you’re noticing any of these warning signs, seek professional advice.