What Nobody Tells You About Borehole Water in Paarl

A borehole feels like the end of a problem. No more restrictions, no more watching the meter, no more paying for water you use on the garden. And around Paarl it is a genuinely sensible thing to have. The farms and smallholdings out towards Windmeul and Simondium have run on groundwater for generations, and Day Zero pushed a lot of town properties in Lemoenkloof, Klein Parys and Dal Josafat onto the same idea.

What almost nobody tells you at the point of sale is what happens after the drilling rig leaves. There is a by-law you are now inside. There is a rule about how that water may reach your house that a surprising number of local installations break. And there is what the water itself does over five or ten years to a geyser, a set of pipes and a washing machine, quietly, while it looks perfectly clean coming out of the tap.

None of this is a reason not to have a borehole. It is a reason to have it set up properly. Here is the whole picture.

The registration question, and why the answer changed this year

Start here, because it is the thing most Paarl homeowners are currently confused about, and there is a lot of wrong information circulating in local groups.

There are two separate systems, national and municipal, and they have nothing to do with each other.

Nationally, a household borehole used for what the National Water Act calls "reasonable domestic use" falls under Schedule 1 of that Act. That means no water-use licence. When the Department of Water and Sanitation ran a 90-day national water-use registration drive, a great many households panicked, assuming they now had to register. In July 2026 the DWS confirmed the opposite: households using a borehole for reasonable domestic purposes are exempt, small non-commercial home gardens included, and domestic users in that category cannot be penalised or prosecuted for not registering. There is no litres-per-day threshold; the test is simply whether the use is reasonable and non-commercial. Registration is for commercial, agricultural, industrial and high-volume users.

Locally is where your actual obligations sit, and the DWS was explicit that municipal by-law requirements are separate and still apply. That is the part nobody mentions.

What the Drakenstein by-law actually requires

The relevant document is the Drakenstein Water and Sanitation Services By-law, 2023. It defines a borehole broadly, a well, a well-point, a spring or any constructed underground cavity used to collect water, so a well-point on a town plot counts exactly the same as a proper borehole on a farm. Four things in it matter to a homeowner:

• Approval before use (s.55(1)). No person may use water from a source other than the municipal supply for domestic purposes without the municipality's approval. Rainwater tanks that are not connected to your potable plumbing are exempt; a borehole is not.
• Notification within 14 days (s.55(5)). Once there is an alternative source on the property, the owner must notify the municipality within fourteen days.
• A meter on every borehole (s.56(8)). Each borehole must be fitted with a measuring device, and readings must be taken at the beginning of each month. This is the one people are most surprised by, and it is a flat requirement, not a suggestion.
• Water quality is your responsibility (s.56(6) and s.57(1)). The owner must ensure the water always complies with SANS 241, and the municipality can require sample analyses from an accredited laboratory, at the owner's cost.

And one that catches people financially: under s.56(4), having a borehole does not remove the basic charge on your municipal connection. That charge is based on the size of your municipal meter, and you keep paying it. A borehole reduces the volume you buy; it does not disconnect you from the network.

The connection rule that catches most homes

This is the big one, and it is worth reading twice.

Section 56(5) of the by-law says that water from an alternative source may under no circumstances be connected to a water installation for potable water which is connected to the municipal water supply system. Section 58(5) says the same thing about the municipality's own non-potable supply. The wording is absolute; there is no "unless" in it.

In plain terms: your borehole and your municipal supply may not share the same pipework. The common local arrangement, where a plumber tees the borehole into the house line with a changeover valve so the family runs off groundwater and flicks back to municipal when the hole is resting, is exactly what that section prohibits.

The reason is not bureaucratic. A cross-connection like that is a backflow path. If pressure in the street drops, and it does drop, during a burst or a scheduled shutdown, untreated groundwater can be drawn backwards out of your property and into the municipal main that feeds your neighbours. One badly plumbed changeover valve is a public health problem, which is why the by-law also carries general backflow-prevention duties in section 54.

There are two ways to do it properly:

1. Keep the systems physically separate. Borehole water runs its own dedicated lines to the garden, the pool, the outside taps, the toilets, wherever you have decided to use it, and never touches the potable plumbing. Simple, cheap, and the right answer for most homes whose real goal is to stop paying for garden water.
2. Feed the house through a break tank with an air gap. Where you genuinely want the house running off the borehole, the water goes into a tank and is pumped from there, with the municipal top-up discharging into that tank through a physical air gap rather than a plumbed connection. Nothing can travel backwards across an air gap. This is the arrangement that also lets you treat the water properly on its way in.

If your setup does not look like one of those two, it is worth having someone look at it. It is usually a modest change, and it is the difference between a compliant installation and one that fails the moment anyone official asks.

Why your neighbour's borehole is nothing like yours

Here is something the drilling quote will not tell you: in this specific area, borehole yield is a lottery decided by cracks in the rock, not by depth or by how good the driller is.

Paarl sits at the foot of an enormous granite dome, with the valley around it underlain by the Malmesbury Group, an old sequence of shale and metasedimentary rock. Malmesbury rock is not naturally generous with water. On its own it typically yields under half a litre a second, which is a trickle.

But a study of thirty boreholes around Paarl found yields of up to 21 litres a second where a hole happened to intersect high-yielding fractures, with the best results correlating to proximity to the inferred extension of the Wellington–Piketberg Fault and Shear Zone. Miss those fractures and you are back to under 0,5 litres a second. Two properties on the same street can therefore end up with boreholes that differ by a factor of forty.

That has three practical consequences:

• Do not size your plumbing off your neighbour's experience. The pump, the tank and the whole design should follow a proper yield test on your hole, done by the borehole contractor before anyone chooses equipment.
• An oversized pump on an underperforming hole is a fast way to burn out a motor. Over-pumping draws the level down, the pump runs dry or cycles rapidly, and it fails.
• Storage matters more here than in high-yield areas. A modest hole plus a decent tank often serves a household better than a strong pump on a weak hole.

The same geology has a second effect. Malmesbury groundwater is known for relatively higher salinity than the sandstone aquifers people picture when they think of mountain water. That shows up as dissolved solids, and dissolved solids are what end up on the inside of your geyser.

Iron and manganese: clear in the glass, orange in the basin

The single most common complaint we get about borehole water is that the water looks perfectly clean, and yet the basins, the bath, the tiles, the toilet cistern and the white washing all slowly go a rusty brown or a dirty grey-black.

There is a simple explanation. Underground, under pressure and with no oxygen, iron and manganese are dissolved and completely colourless. They are in the water when you fill the glass; you just cannot see them. The moment that water meets air, or meets chlorine, they oxidise, change form and become solid particles. Iron goes yellow then rust-brown. Manganese goes grey-black. That reaction happens in the basin, on the tiles, in the fibres of the washing, and on the inside of your pipes.

The thresholds are far lower than people expect. SANS 241 sets the aesthetic limits at 0,3 mg per litre for iron and just 0,1 mg per litre for manganese. Those are staining limits, and it takes very little to stain persistently. The health limits sit higher, at 2 mg/ℓ and 0,4 mg/ℓ respectively, so in most cases this is a nuisance-and-damage problem rather than a danger, but it is a nuisance you cannot scrub your way out of.

Removing them is a sequence, not a single cartridge: correct the pH first, then oxidise the dissolved metals into particles, then filter the particles out. A general-purpose sediment filter bought off a shelf does almost nothing to dissolved iron, which is why so many homeowners conclude that "filters don't work" after fitting the wrong one.

What it does to your geyser, your pipes and your appliances

This is the cost nobody puts on the quote, because it arrives years later.

Scale. Hard water carries dissolved calcium and magnesium. Heat it and the chemistry shifts, and those minerals come out of solution as a hard crust on the hottest surface in the system, which is your geyser element. A scaled element has to work through an insulating layer to heat the water, so it runs hotter, uses more electricity and fails early. That popping or rumbling from the geyser cupboard is scale, not air. Left alone it takes the element first and then contributes to tank corrosion. The same crust builds up inside copper, galvanised and even plastic pipes, narrowing them, dropping your pressure and wearing out taps and valves.

Warranties. This one genuinely surprises people: most geyser warranties exclude damage caused by hard or borehole water. Gas geysers in particular are explicit about it. So the failure that scale causes is very often the failure you pay for yourself. If your house runs on groundwater and you have not treated it, you are effectively self-insuring your water heating.

Corrosion, the opposite problem. Not all groundwater is hard. Some is acidic, and water below the SANS 241 pH range of 5,0 to 9,7 attacks metal from the inside. The tell-tale sign is blue-green staining around taps and fittings, which is copper dissolving out of your own pipework, and the eventual result is pinhole leaks in places that were perfectly sound.

Sediment. Sand and fine grit from the hole jams pump impellers, sticks valves, blocks the aerator screens in taps and clogs the inlet on a geyser. It also chews through pressure-reducing valves, which is why a PRV on a borehole supply often does not reach the ten to fifteen years it should.

Can you drink it?

Not until you have had it tested. That is not us being cautious; it is the standing position across the Cape since Day Zero, and the reasoning is simple: borehole water is not part of the municipal system, so nobody is testing it for you. Municipal water is monitored continuously. Your borehole is monitored by exactly nobody unless you arrange it.

A proper analysis by a SANAS-accredited laboratory against SANS 241 covers the things you cannot see or taste. The ones worth understanding:

• Bacteria (E. coli and coliforms). The reason septic tanks, kraals, old soakaways and neighbouring agricultural land matter. This is the acute risk and the reason untested groundwater should never go to a kitchen tap.
• Nitrate, limit 11 mg/ℓ as N. This is an acute health limit, and it is the one to take most seriously in farming country, where fertiliser and animal waste raise nitrate in shallow groundwater. It is tasteless, colourless, and genuinely dangerous to infants.
• pH, 5,0 to 9,7. Outside that band the water is working on your plumbing.
• Total dissolved solids, 1 200 mg/ℓ, chloride 300 mg/ℓ, sodium 200 mg/ℓ. The salinity markers, worth watching given the local geology.
• Iron and manganese as above, mostly a staining and damage question.

Budget from around R850 for a borehole suite, and nearer R2 000 for a full SANS 241 analysis. Set against a geyser, a set of pipes or a family's health, it is not the place to save money. Re-test periodically too, because groundwater quality moves with the seasons and with what happens on the land around you.

What a properly set-up borehole home looks like

Pulling all of it together, here is the checklist worth measuring your own installation against:

1. The municipality knows about it. Approval obtained, notification made, and you are not relying on nobody ever asking.
2. There is a meter on the borehole, and someone reads it at the start of each month, as s.56(8) requires.
3. The borehole water and the municipal water never share a pipe. Either fully separate lines, or a break tank with a physical air gap. No tee, no changeover valve on the potable line.
4. The pump was sized off a yield test on your hole, with a non-return valve on the discharge and a pressure tank to stop the pump short-cycling itself to death.
5. You have a lab analysis from an accredited laboratory, and the treatment you have installed matches what that analysis actually found.
6. The geyser is protected, whether that is by treating the water going into the house or by keeping the geyser on municipal supply and running the borehole to the garden, pool and toilets instead. That second option is cheaper than most people assume and solves most of the damage risk in one move.

If you are somewhere short of that list, you are in the same position as most borehole properties around Paarl, and none of the gaps are hard to close. If you want a straight assessment of how yours is plumbed, what the by-law expects of it and what treatment your water actually needs, that is a job we do regularly, with the price agreed before we start.