Sewer Smell and Drain Smell Repairs in Randburg

A client in Fairland called us about a sewage smell in their guest bathroom. They'd had the bathroom professionally cleaned twice. The smell always came back within a few days. Turns out, the P-trap under the basin had dried out completely — the bathroom hadn't been used in months, and the water seal in the trap had evaporated. A simple fix once you know what to look for.

Most drain smells have straightforward causes. The trick is knowing where to look.

Sewer gas is always present in your drainage pipes. The reason you don't normally smell it is because of water seals in your traps and proper ventilation. When either of those fail, the smell escapes into your home.

Common causes:

• Dry P-traps — every drain has a U-shaped trap that holds water to block sewer gas. If a drain isn't used for weeks, the water evaporates and the smell comes through.
• Broken or loose seals — the wax ring under a toilet or the rubber seals on basin wastes can crack or shift over time, letting gas bypass the trap.
• Blocked vent pipes — every drainage system has vent pipes that go through the roof. If they're blocked by birds' nests, leaves or debris, the system can't breathe properly and sewer gas gets pushed back into the house.
• Damaged sewer connections — cracked pipes, tree root intrusion or failed joints underground can allow gas to seep up through the floor or walls.
• Missing or faulty floor drain traps — floor drains in garages, laundries and bathrooms are common culprits, especially in older Randburg homes.

Randburg's suburbs have a mix of home ages and drainage systems. Here's what we see most often:

In Fairland, many homes were built in the 1970s and 80s with clay sewer pipes. These crack and shift over time, especially where tree roots have grown into the joints. The smell often comes up through the garage floor drain or the main bathroom.

Northcliff homes tend to be newer with PVC drainage, but we still find problems — usually blocked roof vents or guest bathrooms where the traps have dried out.

Across Randburg, floor drains are a common issue. Garages, outdoor bathrooms and servant's quarters often have floor drains that go unused for months. One cup of water poured down the drain is usually enough to restore the trap seal.

We don't guess. We follow a systematic process:

1. Check every trap — we inspect all P-traps, bottle traps and floor drains in the affected area. Dry traps are the most common cause and the easiest fix.
2. Test the seals — we check toilet wax rings, basin waste seals, and bath trap connections for any gaps.
3. Inspect the vent system — if traps are fine, we check the vent pipes for blockages. A blocked vent causes the whole system to malfunction.
4. Camera inspection if needed — for persistent smells or suspected underground damage, we run a drain camera to see inside the pipes without digging.
5. Fix it right — once we find the source, we fix it properly. No masking the smell with chemicals — we eliminate the cause.

Once we've fixed the problem, here's how to keep it from coming back:

• Run water in every drain at least once a week — even unused guest bathrooms, garage floor drains and outdoor basins
• Don't pour cooking oil down drains — it coats the inside of pipes and traps bacteria
• Check your vent pipes after storms — debris can block them
• If you smell gas after being away on holiday, run all your taps for a minute to refill the traps

Simple habits go a long way. And if the smell comes back, we're a phone call away.