Borehole quotes can be hard to compare because companies bundle the job differently. Asking for each part separately is the easiest way to see what you're paying for.
The parts of a borehole job
- Siting. Choosing where to drill, by geological survey or the driller's own method. Ask how the site is chosen and whether siting is included.
- Drilling. Usually priced per metre. The final depth isn't known until water is found, so a quote is an estimate.
- Casing. Pipe that lines the top of the hole to stop it collapsing, also usually priced per metre.
- Yield test. Pumping the hole for a set time to measure how much water it delivers. This tells you what pump to buy and whether the borehole can supply your house, garden or both.
- Pump and installation. The pump, cable, control box and piping to your tank or house.
- Storage and filtration. Tanks, pressure systems and treatment, chosen after the water has been tested.
Questions to ask before you sign
- What's the price per metre for drilling and for casing?
- What depth do you expect, and what happens to the price if you go deeper?
- What happens if the hole is dry? Is there a reduced fee?
- Is a yield test included, and for how long?
- Will you arrange a water quality test?
- How long is the warranty on the pump and the workmanship?
Water quality
Borehole water can contain minerals, iron or bacteria, so have it tested by a lab before drinking it. The results decide what filtration you need.
Registration
Domestic use from a borehole is generally allowed, but larger volumes may need to be registered or licensed with the Department of Water and Sanitation. Ask your driller, or check with the department if you plan heavy irrigation.
This guide is general information. Ask each company for a written, itemised quote.