How much does water tank waterproofing cost in Ghana?

Internal waterproofing of a concrete water tank in Ghana costs GHS 180-280 per square metre of internal surface using a food-safe system. A typical 10,000 litre underground tank has roughly 30 square metres of internal surface, giving GHS 5,400-8,400. External-only repairs to seams and fittings are far cheaper, from around GHS 800.

Why does potable water tank waterproofing cost more?

Drinking water tanks require a certified food-safe system, which costs more than construction-grade material. The tank must also be fully drained, cleaned, dried, treated, cured and then flushed before being returned to service — so the labour and downtime are greater than for a non-potable tank.

Can you waterproof a water tank without emptying it?

Only for external repairs. A small external seam or fitting leak can be sealed with butyl tape after draining below the leak level. Internal waterproofing always requires the tank to be fully emptied, cleaned and dried — no internal system will bond to a wet surface.

How do I know if my water tank is leaking?

Fill the tank, mark the level, and turn off all outlets overnight. Any measurable drop by morning that cannot be explained by usage indicates a leak. Other signs are persistent damp on the external wall or surrounding ground, unexplained increases in pumping frequency, and rising water bills.

Water Tank Waterproofing Cost in Ghana — 2026 Price Guide

August 30, 2026

Water Tank Waterproofing Cost in Ghana — 2026

Internal waterproofing of a concrete water tank costs GHS 180–280 per m² of internal surface using a food-safe system. External seam and fitting repairs start from around GHS 800. A typical 10,000 litre underground tank comes to GHS 5,400–8,400.

Cost by Tank Size

Tank capacity	Internal surface	Cost range
5,000 litres	~20 m²	GHS 3,600–5,600
10,000 litres	~30 m²	GHS 5,400–8,400
20,000 litres	~48 m²	GHS 8,600–13,400
50,000 litres	~90 m²	GHS 16,200–25,200
External seam / fitting repair	Localised	From GHS 800

Surface areas are approximate and depend on tank proportions. We measure on site.

What's Included

Drain, clean and dry the tank
Remove loose material, scale and old failed coating
Crack repair and structural patching
Treatment of active leaks with hydraulic cement
Food-safe waterproofing system, applied to full internal surface
Detail treatment at inlet, outlet, overflow and construction joints
Full cure period
Flush and refill
Flood test and 3-year workmanship warranty

Why Potable Tanks Cost More

Three reasons, and all of them are legitimate:

Certified food-safe material. Construction-grade waterproofing must not be used inside a drinking water tank. Certified systems cost more per litre.
Longer process. Drain, clean, dry, treat, cure, flush, refill. Each step takes time and the tank is out of service throughout.
Full cure before contact. The system must be fully cured and flushed before water returns — no shortcuts.

If a quote for a drinking water tank looks unusually cheap, ask which certified food-safe product is being used. If there is no clear answer, do not proceed.

What a Leaking Tank Actually Costs You

A slow leak is easy to ignore. Over a year it rarely is.

Consequence	Impact
Water loss	Continuous; you pay for water that leaves the tank
Pump cycling	More running hours, higher electricity, shorter pump life
Ground saturation	Undermines foundations around an underground tank
Contamination	A crack that lets water out also lets groundwater in
Structural	Reinforcement corrodes; repair cost multiplies

The contamination point is the serious one. A leak is a two-way path. Groundwater entering a potable tank is a health issue, not a maintenance issue.

Test Your Tank Tonight

Fill the tank and mark the water level clearly
Turn off every outlet and the inlet
Leave overnight, at least 8 hours
Check the mark in the morning

Any drop that usage cannot explain means a leak. Note the level it settles at — that usually tells you the height of the defect.

Book a Tank Survey

Free assessment, written fixed-price quote, food-safe systems for potable storage, 3-year workmanship warranty and 20-year design life.

👉 Book Free Assessment · 0555 548 001

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