Water insecurity is doing for plumbers what load-shedding did for electricians. Crumbling municipal infrastructure, Day Zero scares and persistent droughts have made rainwater harvesting, boreholes, greywater reuse and tank installations a genuine growth market. The good news for installers: rooftop rainwater needs no national water licence, only municipal installation approval. The rules tighten as you move to groundwater.
The opportunity
The City of Cape Town actively promotes alternative water sources, and eThekwini and Gqeberha have both lived through severe supply crises. That translates directly into work for plumbers, civil contractors and specialist installers: tanks, pumps, filtration, backflow protection and the plumbing that ties it together. Unlike solar, much of this work needs no new qualification, just plumbing competency applied to a booming niche.
The regulatory picture, simply
- Rainwater harvesting. No national water-use licence is required to collect rain off a roof. Cape Town, for example, requires approval for the installation (the plumbing connection to the house), not a licence for the water itself. Greywater reuse is treated the same way: installation approval, no Department of Water and Sanitation (DWS) licence.
- Boreholes, Schedule 1 use. Small domestic use, non-commercial gardening and livestock watering need no registration if abstraction stays under 10 m3 a day.
- Boreholes, General Authorisation (GA). Commercial or larger use must be registered with the DWS. The GA volume is calculated as the quaternary catchment's allocation (m3 per hectare per year) multiplied by the property size, capped at 40,000 m3 a year for any single property.
- Water Use Licence (WUL). Required when abstraction exceeds the GA limit or the site sits in a sensitive catchment (within 500 m of a wetland or 100 m of a watercourse). Budget realistically: the full WUL process takes six months to over a year.
Groundwater is regulated nationally under the National Water Act 36 of 1998, and municipal by-laws cannot override it. Useful practitioner guidance is published by GEOSS and Umvoto.
The skills you need
For rainwater and greywater systems: plumbing competency to SANS 10252 and SANS 10106, the ability to install RPZ (reduced pressure zone) backflow preventers wherever an alternative supply meets the municipal supply, and pipe colour-coding knowledge, because non-potable lines must be clearly marked. Tank installation itself is generally open to a competent builder or plumber. Borehole drilling is specialist work for a licensed driller with the rig to match; plumbers typically take over at the pump-and-pipe stage once the hole is drilled.
Worked example: the tank job done right
A plumber in a coastal city is asked to install a 5,000-litre JoJo tank fed from the roof for a residential client. The clean sequence:
- Confirm no DWS licence is needed (rainwater, domestic use).
- Obtain the municipality's installation approval.
- Install an RPZ backflow preventer on any connection to the municipal supply.
- Colour-code the non-potable pipework.
- Sign off with a plumbing Certificate of Compliance under SANS 10252.
No CIDB grading is needed for private residential work. One honest caveat: municipal by-law requirements for tank installations vary significantly between municipalities, so check the specific water by-law before you quote, not after.
Common mistakes
- Skipping the RPZ valve. Cross-connection between rainwater and municipal supply is the classic compliance failure and a health risk.
- Treating borehole work as licence-free. Schedule 1 is narrow. Commercial use, irrigation at scale or sensitive catchments trigger GA registration or a full WUL.
- Quoting before checking the local water by-law. Requirements differ by municipality, and rework eats the margin.
- Unmarked non-potable pipes. Colour-coding is a compliance requirement, not decoration.
- Promising WUL timelines you cannot control. Tell commercial clients the licence can take a year.
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