Greywater Diversion in Cape Town: What's Actually Legal in 2026

During the 2017–2018 Day Zero crisis, thousands of Cape Town households rigged temporary greywater diversions — washing machine hoses into buckets, bath plugs feeding garden hoses, even drilled bath traps. Eight years on, many of those "temporary" installations are still in place, and the City has tightened its bylaws. Here's where you actually stand.

What counts as greywater

Under the Cape Town Water By-law (as amended 2023), greywater is wastewater from:

• Hand basins, baths and showers
• Washing machines (laundry only — no nappies, no chemical-heavy loads)
• Kitchen sinks are explicitly NOT greywater — they're blackwater because of food solids and grease

Dishwasher water is also classified as blackwater in CoCT's interpretation.

What's allowed without approval

• Bucket reuse — manually carrying greywater to the garden. No restrictions.
• Direct-to-soil subsurface irrigation of greywater under 100 L/day, provided it doesn't pond, run off, or reach the property boundary.
• A diverter valve on the washing machine outlet that lets you switch between sewer and garden, provided the garden line discharges below mulch level.

What requires plumber sign-off and council notification

• Any permanently plumbed system delivering more than 100 L/day
• Any system with a storage tank (regardless of size)
• Any system serving multiple fixtures through a manifold

The installation must comply with SANS 10252-2 for non-potable water, including:

• Purple-coded pipes (or clearly marked) for all non-potable runs
• Backflow prevention between greywater and potable supply (RPZ valve, not just a check valve)
• No spray irrigation — drip or subsurface only
• 24-hour maximum storage before discharge or treatment (greywater turns septic fast)

What gets you fined

• Greywater pooling on the surface or running into a stormwater drain — R1 500 first offence, escalating
• Cross-connection between greywater and potable lines — R5 000 + mandatory remediation
• Discharging greywater into a neighbour's property — civil and bylaw exposure
• Untreated greywater storage tanks visible to inspectors (a tank with the wrong colour or no label)

CoCT inspectors do drive-bys in known DIY-diversion suburbs (Pinelands, Newlands, Constantia). Don't assume invisibility.

Practical 2026 setup that's compliant

For a typical 3-bed home running washing machine + 2 showers to garden:

1. Stainless three-way diverter valves on each fixture's waste — R350–R600 each
2. 50 mm purple-marked HDPE manifold to a 200 L surge tank with overflow back to sewer
3. Pump (small Mono or DAB) + 5-micron filter feeding subsurface drip lines
4. RPZ valve on the potable top-up if you're filling the tank
5. Plumber's compliance certificate (PIRB) and a courtesy notification to CoCT

Budget R12 000–R28 000 installed. Payback at current Cape Town water tariffs is 3–6 years for a household using 25 kL/month.

What's coming

CoCT's draft 2027 amendments propose requiring PIRB sign-off on all greywater installs over 50 L/day and registration on the property's water account. If you've got a grey-area Day Zero install, regularising it now is cheaper than retrofitting after the bylaw lands.