Defect type
Critical · 3–5/5
Stormwater Cross-Connected to Sewer Drain
I investigated a sewage odour reported after rain and traced a downpipe, surface drain, or sub-soil line into the sanitary sewer - an illegal cross-connection. Reference: AS/NZS 3500.3. In heavy rain the extra hydraulic load surcharges the sewer main, and in my experience sewage can back up into the house through floor wastes and gully traps. Owners also face penalties from the water authority.
Causes
- Historic illegal connection predating metered compliance inspections
- Renovator tying a new downpipe into the nearest accessible drain
- Collapsed or modified pit allowing stormwater to flow into a shared trench
Symptoms to look for
- Sewer odour from gully or floor waste during or after heavy rain
- Overflowing gully trap during storm events
- Dye or CCTV test tracing stormwater into the sanitary line
Remedies
- Engage a licensed plumber to disconnect the stormwater tie-in and reinstate a legal point of discharge
- Inspect and clean the sewer line where solids may have been displaced
- Notify the water authority where required and retain rectification paperwork
Critical
Get an inspector through this property.
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