How Do I Get Water Pressure Back After an Outage? (SA Guide 2026)

Quick answer

90% of post-outage pressure problems are an airlock or a blocked aerator clogged by sediment that the restart pushed through the pipes. Both are 5-minute DIY fixes.

Step 1: Clear the airlock

1. Open every tap in the house, hot and cold, top floor first.
2. Open the garden tap fully.
3. Wait 3-5 minutes. You'll hear spluttering, then a steady flow.
4. Close from the lowest tap upward.

Step 2: Clean the aerators

Unscrew the mesh tip from each tap. You'll find sand, rust flakes, and limescale. Rinse, soak in vinegar for 15 minutes, refit. Pressure usually doubles immediately.

Step 3: Check the geyser

If only hot water is weak, your geyser cold inlet vacuum breaker may have stuck. Tap it gently. Still weak? The pressure reducing valve has failed (common in Cape Town after the 2018 drought repairs).

Step 4: Test the main

Open the garden tap closest to the meter at full bore. Weak flow there means it's still a municipal problem, not yours. Phone the municipal hotline before paying a plumber.

When it IS your pipes

Persistent low pressure on one tap = galvanised pipe corroded internally. Persistent low pressure house-wide after the above = failed PRV (R650 part, R1,400 fitted).

Need help? Book a water pressure specialist in Durban or Johannesburg.