Quick answer
A professional rain water harvesting system collects roof runoff, stores it safely and supplies water for suitable uses such as garden irrigation or toilet flushing. For a Springs property, the design should match your roof catchment, available space and water demand, with a stable tank base, controlled overflow and protection for the municipal drinking-water supply.
When a rain water harvesting system makes sense
Harvesting is worth considering if you regularly use municipal water outdoors, want stored water for non-drinking uses or already have a tank that is difficult to use. Start with a clear purpose: supplying a garden hose is a different job from supplying toilets inside the house.
An existing installation may need attention if the tank leans, the pump repeatedly switches on and off, or overflow collects against a wall. A tank can capture some runoff, but it cannot replace properly designed stormwater drainage, particularly once it is full.
- You have accessible roof downpipes and space for supported storage.
- Your garden or other non-drinking uses create regular water demand.
- Your existing tank has no useful outlet pressure or reliable overflow route.
- You want to reduce municipal water use without assuming rainfall will provide a year-round supply.
What affects installation cost
Cost depends on the collection area, storage capacity and where the water needs to go. Tank size should reflect both potential roof runoff and how quickly you will use the stored water; a larger tank is not automatically the better choice.
Ask for a scope that separates the tank and base, collection pipework, pump, treatment and any internal plumbing alterations. Confirm whether electrical work, difficult access and reinstatement are included before agreeing to proceed.
- Tank capacity, shape, number of tanks and delivery access.
- Ground preparation and a base that meets the tank manufacturer's requirements.
- Gutter repairs, downpipe alterations, debris screens and first-flush diversion.
- Pump flow and pressure requirements, controls and electrical provision.
- Pipe distances, filtration, backflow protection and municipal top-up arrangements.
- Overflow drainage and access for future cleaning and maintenance.
Planning for Springs rainfall and dry spells
Springs receives summer rainfall, so the system needs to handle concentrated inflow during storms as well as periods with little rain. Gutters, inlets and overflow outlets must work together. Once storage is full, excess water still needs a suitable drainage route that does not undermine the base, wet foundations or create a nuisance for neighbours.
Choose a tank position with room to inspect fittings, clean screens and service the pump. Keep lids secure and screen openings against insects. If municipal water will top up the tank, the connection needs appropriate separation and backflow protection; a simple valve between the two supplies is not a safe substitute.
- Check roof materials and contamination risks before choosing how to use the water.
- Use an opaque, covered tank intended for water storage.
- Label non-potable outlets clearly.
- Confirm applicable City of Ekurhuleni requirements before altering supply connections.
Discuss your Springs installation with Fox Plumbing
Fox Plumbing is based in Benoni and serves the East Rand and greater Gauteng. Owner Evan Pretorius is a qualified registered plumber with more than 20 years of experience and remains on the tools. Fox Plumbing is a member of IOPSA and PIRB and issues Certificates of Compliance; ask which certification applies to your proposed work.
The price is agreed upfront, the call-out fee includes the first hour of work, and every job is insured. Pensioners receive a special rate. Phone 084 368 1879 to discuss your Springs property, Monday to Friday from 08:00 to 17:00, or arrange a Saturday appointment.
- Have photos of the roof, downpipes and proposed tank position ready.
- Explain whether you want garden water only or connections to indoor fixtures.
- Mention existing tanks, pumps and any access restrictions.
How we do the job
- 1
Assess the property and intended use
Inspect the roof catchment, gutters, downpipes, drainage and available space. Identify which outlets will use harvested water and whether the roof is suitable for that purpose.
- 2
Size the storage and specify the system
Balance rainfall, usable roof area and expected demand. Specify the tank, debris screening, first-flush diversion, pump and treatment needed for the intended use.
- 3
Prepare the support and overflow route
Provide a level, load-bearing base to the tank manufacturer's specifications. Plan where excess water will discharge safely before placing the tank.
- 4
Connect collection and storage
Fit collection pipework, accessible screens and the first-flush device. Secure tank lids and fittings, and protect openings against insects.
- 5
Install the delivery plumbing
Connect the selected outlets, pump and controls where required. Keep non-potable plumbing separate from drinking-water plumbing, with compliant protection for any municipal top-up.
- 6
Test and explain maintenance
Check for leaks, confirm pump operation and test overflow flow paths. Explain isolation points, screen cleaning, filter servicing and the limits of the water's intended use.
Common questions
Can I drink harvested rain water? +
Do not assume tank water is safe to drink. Roof runoff can contain microorganisms and chemical contaminants. Drinking-water use needs a suitably designed treatment system, water-quality testing and ongoing maintenance; a leaf screen or first-flush diverter does not make it potable.
Will a rain water tank supply water during an outage? +
Only if it contains enough usable water and can deliver it to the intended outlets. An electric pump will also need power. Rain-fed storage is not a guaranteed backup supply, especially during dry periods.
Do I need a pump? +
It depends on the tank position and required flow and pressure. A low outlet may fill a watering can by gravity, while irrigation equipment or toilet supply may need a pump. Avoid raising a heavy tank on an improvised stand to gain pressure.
Can harvested water be used to flush toilets? +
Yes, with suitable dedicated plumbing and water quality for that use. The installation must prevent harvested water entering the municipal drinking-water supply. Any top-up arrangement should be designed as part of the system.
What maintenance does the system need? +
Remove debris from gutters and screens, check that the first-flush device drains as designed, and inspect lids, insect screens and overflow outlets. Service pumps and filters according to their manufacturers' instructions, and assess sediment build-up periodically. Do not enter a tank yourself.
