Why Nigerian Homeowners Need a Borehole
Unreliable mains water supply affects millions of Nigerian households. A private borehole is one of the most impactful infrastructure investments a homeowner can make — delivering independence, reliability, and long-term cost savings. But done poorly, it's expensive and short-lived. Done right, it serves your property for 20–30 years.
Site Selection: The Most Critical Step
Before a single metre of ground is broken, a proper geological survey must be conducted. This determines where water-bearing rock formations lie, at what depth, and whether the yield will be adequate for your household size. Skipping this step is the number one mistake homeowners make when drilling goes badly.
Key factors our technicians assess during site selection:
- Geological composition — clay, laterite, and basement rock all behave differently
- Water table depth — typically 30–150ft in southern Nigeria, 100–300ft in the north
- Distance from septic tanks and waste pits — minimum 30 metres is essential
- Surface accessibility — drilling rigs are large; routes must be planned
The Drilling Process Explained
Modern rotary drilling uses a rotating drill bit to penetrate geological layers. As the bit descends, drilling fluid is circulated to carry cuttings to the surface and stabilise the borehole wall. The entire process typically takes 2–5 days depending on depth and ground conditions.
Stage 1: Surface Casing
The first 10–15 metres are lined with large-diameter steel or PVC casing to prevent surface contamination and collapse of the upper soil layers. This is grouted in place with cement to create a watertight seal.
Stage 2: Drilling to Water-Bearing Formation
Drilling continues through rock until a productive aquifer is reached. Your technician will monitor drill cuttings and water returns to identify when this occurs.
Stage 3: Casing and Screening
Once depth is reached, production casing is installed. A well screen (slotted PVC or stainless steel) is placed at the aquifer zone to allow water in while keeping sand out. The annular space between casing and borehole wall is filled with gravel pack.
Stage 4: Development and Pump Testing
The new borehole is developed by pumping to remove fine particles. A pump test is then run for 4–8 hours to determine the borehole yield in litres per hour — essential data for selecting the right pump.
Choosing the Right Pump System
Submersible pumps are standard for boreholes deeper than 20 metres. Pump selection depends on three things: borehole yield, your household's peak water demand, and the total head (depth + pipe friction losses). Over-sized pumps waste electricity and shorten borehole life. Under-sized pumps leave you without adequate pressure.
A well-sized system for a 5-bedroom home in Abuja typically requires a 0.75–1.5kW submersible pump capable of delivering 3,000–6,000 litres per hour.
Water Quality Testing
Every borehole Domptima commissions undergoes laboratory water quality testing before handover. We test for coliform bacteria, nitrates, iron, manganese, pH, hardness, and turbidity. If any parameter exceeds WHO guidelines, we recommend and install appropriate treatment — UV disinfection, sediment filtration, or iron removal units.
What It Actually Costs in 2025
Pricing varies by depth, location, and material quality. Rough ranges for reputable installations in Nigeria:
- Shallow borehole (30–60ft): ₦350,000 – ₦550,000
- Medium borehole (60–150ft): ₦550,000 – ₦900,000
- Deep borehole (150–300ft): ₦900,000 – ₦1,800,000
These figures include drilling, casing, pump, pressure tank, and surface works. Be extremely cautious of quotes below ₦300,000 — corners will be cut on materials or depth, and you'll pay again within 2–3 years.
Maintenance Schedule
A well-maintained borehole should last 25+ years. Key maintenance activities:
- Every 6 months: Check pump performance, water level, and electrical connections
- Every 2 years: Full water quality re-test, check casing integrity
- Every 5–7 years: Pull and inspect pump; replace impellers if worn
- Every 10–15 years: Full pump replacement and borehole re-development
How to Choose a Contractor
This is where most homeowners get burned. Look for contractors who provide a written borehole log (geological record of the drilling), conduct a formal pump test with documented results, supply a certificate of completion with casing specification, and offer a minimum 2-year workmanship guarantee. If a contractor can't provide all of these, walk away — regardless of price.
