Borehole Water: Testing, Filtration and Safety

Is borehole water safe to drink? Test it first, then match any treatment to the lab result. This page covers test costs, the main treatment types and what each one cannot do.

Last reviewed 2 October 2026. Prices are market indications from public pages, not quotes.

Important: Always Test Your Borehole Water

Never assume borehole water is safe to drink without testing. Even clear, odourless water can contain harmful bacteria, nitrate, fluoride or heavy metals. Get a lab test before using borehole water for drinking or cooking.

Is borehole water safe to drink? →Find water testing services near you →

Borehole Water Testing

A lab test is the first step to understanding your borehole water. These are the common packages. Prices are indications from lab and supplier price pages and differ by lab, so ask for a quote.

Test Package	What's Included	Cost
Chemistry (SANS 241)	Metals, nitrate, nitrite, fluoride, sodium, chloride, sulphate, TDS, conductivity, pH	R1,450 - R3,000
Microbiology (SANS 241)	E. coli, total coliforms, heterotrophic plate count	R900 - R1,200
Chemistry plus microbiology (SANS 241)	The full chemical panel plus the microbiological tests	R2,200 - R3,000
Screening panel	pH, TDS, hardness, iron, manganese. Not a full SANS 241 test	Varies by lab

More detail on packages, sampling and reading results is on our water testing page, and the limits are in our water quality guide.

What Treatment Can and Cannot Do

Treatment must match your lab results. There is no single filter that fixes every borehole.
Reverse osmosis cuts dissolved salts, nitrate and fluoride, but a household unit is not a certified germ barrier.
UV works only in clear water and does not remove chemicals, so it does nothing for nitrate, fluoride or iron.
A softener removes hardness. It does not make water safe to drink.
Re-test after any treatment is installed, and again when the system or the water changes.

Borehole Water Treatment Options

Choose treatment from your lab results. Many borehole setups combine several stages. Our borehole water filters guide goes through each type in more detail.

Sediment Filters

Remove sand, silt and particles. Most boreholes benefit from a sediment filter, and it protects the treatment stages after it. UV needs clear water, so filter out turbidity first.

Best for: First-stage particle removal

SandSiltRust particles

Carbon / Activated Carbon Filters

Improve taste and odour and remove some organic chemicals. Chlorine removal matters only if you chlorinate the water yourself, because raw borehole water is not chlorinated.

Best for: Taste and odour

TasteOdourSome organic chemicals

Iron and Manganese Filters

Common where groundwater is iron-rich, for example parts of the Cape and some Table Mountain Group boreholes. Choose one from your lab result: SANS 241 sets iron at 0.3 mg/L (aesthetic) and 2.0 mg/L (chronic health), and manganese at 0.1 mg/L (aesthetic) and 0.4 mg/L (chronic health).

Best for: Boreholes with orange or brown staining water, or black staining

IronManganeseMetallic taste

Water Softeners

Reduce the calcium and magnesium that cause scale. A softener deals with hardness only. It does not make water safe to drink.

Best for: Hard water that scales pipes and appliances

CalciumMagnesium

Reverse Osmosis (RO) Systems

RO membranes substantially reduce nitrate, fluoride, dissolved salts and many metals, and how much depends on the membrane and the water (our filters guide gives ranges). A household RO unit is not a certified germ barrier: NSF/ANSI 58 certifies chemical reduction, not microbiological purification. If bacteria are a risk, add UV or chlorination.

Best for: Drinking water at one tap, after a lab test shows what must be removed

Dissolved saltsNitrateFluorideMany metals

UV Sterilisation

UV inactivates bacteria, viruses and protozoa only at the right dose and only in clear water. It does not remove chemicals and leaves no residual in the pipes, so it does nothing for nitrate, fluoride or iron.

Best for: Microbiological contamination in clear water

BacteriaVirusesProtozoa

Fluoride and Salinity Treatment

Fluoride (limit 1.5 mg/L, no taste or smell) and high TDS need specific technology, usually RO, and activated alumina or bone char are also used for fluoride. Treat only after a lab test, and re-test afterwards.

Best for: High fluoride or salty borehole water

FluorideDissolved salts

Multi-Stage and Whole-House Systems

A system built around your lab result, often a sediment stage followed by the treatments your water needs. Treatment must match the test results, so there is no standard whole-house package.

Best for: Treating all the water entering the house

Matched to your lab result

Borehole Water FAQs

Is borehole water safe to drink?

Not automatically. It depends on local geology and what is near your borehole, and nobody treats or monitors it for you. Test it at an accredited lab before drinking. Common issues include iron, manganese, nitrate, fluoride, salinity and bacterial contamination. Most borehole water can be treated to meet SANS 241, but treatment must be matched to the lab results and re-tested. Some problems, such as high fluoride, arsenic or salinity, need specific technology. See our guide on whether borehole water is safe to drink.

Where does borehole water come from?

From aquifers: underground layers of rock or sediment that hold water. Rain soaks into the ground and recharges them, but only a small share of rainfall becomes groundwater in South Africa. DWS has calculated about 9 to 13.9 percent of mean annual precipitation for the Chuniespoort dolomite. A borehole is a narrow hole drilled to reach this water, and an aquifer can be drawn down faster than it refills.

How often should I test my borehole water?

No South African rule we found sets a schedule for a private borehole. Recommended practice is a full test before first use, a microbiological test every 6 months if you drink the water, a full chemical and microbiological test every year, and a test after flooding, nearby construction, repairs or any change in taste, colour or smell.

What is the best filtration system for borehole water?

It depends on what is in your water. Many setups start with a sediment filter and then add treatment matched to the lab result, such as an iron and manganese filter, RO for nitrate, fluoride or salinity, or UV or chlorination for bacteria. Get your water tested first, then choose. See our borehole water filters guide.

Can I use borehole water in my swimming pool?

Yes, but high iron or manganese can stain pool surfaces and turn the water brown or green. Test the water first, and you may need to pre-treat it with an iron filter before filling the pool.

How much does a borehole water filtration system cost?

One publisher quotes about R5,000 for a basic system to about R20,000 for an advanced one. The price depends on what the lab finds, so get the test first and ask for itemised quotes.

Need Borehole Water Testing or Filtration?

Send one request and water testing labs and filtration suppliers in your area can quote. Ask whether the lab is SANAS accredited for the tests you need.

Request a Free Quote

Sources

SANS 241-1:2015 drinking water limits (SANAS-accredited lab transcription) (iron, manganese, fluoride and other limits)
SANS 241 packages and prices (H2O Guru) (one lab's package prices)
Cape Town borehole drilling costs 2026: regional price guide (Waterpoint SA) (water test price range)
Borehole prices 2026 (Borehole Hub) (water test price range)
Borehole drilling prices in South Africa (Enviroleg) (water test and filtration price ranges)
What NSF/ANSI 58 covers for RO systems (Water Filter Lab) (commercial summary: chemical reduction, not microbiological purification)
UWC thesis on Table Mountain Group groundwater quality (iron-rich groundwater in the Cape)
DWS Johannesburg 1:500 000 hydrogeological map brochure (recharge of the Chuniespoort dolomite)