Is rainwater harvesting worth it in Nigeria?

In high-rainfall states it commonly replaces most non-drinking water use, cutting tanker and pumping costs. Payback on a basic system is typically two to four years.

Can I drink harvested rainwater?

Only after filtration and disinfection. Add a first-flush diverter, sediment and carbon filtration and UV treatment before any drinking use.

What tank size do I need?

Size it against the dry days you want to cover. The calculator on this page converts your roof area and local rainfall into a recommended tank volume.

Does it work with an existing borehole?

Yes. Most homes use rainwater as the primary wet-season source and fall back to the borehole in the dry season, which extends pump life.

Cost guide

How much does rainwater harvesting cost in Nigeria?

With 1,200–3,000mm of annual rainfall across most of southern Nigeria, an average 120m² roof can capture well over 100,000 litres a year. A basic gutter-and-tank setup starts around ₦250,000; a filtered, pumped system feeding the house plumbing runs ₦1.5m and up. The calculator below estimates your roof yield and the tank size you need to ride out the dry season.

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Prices updated August 2026 · Nigeria

Typical price ranges

Item	Typical cost	Notes
Gutters and downpipes (per 30m run)	₦120,000 – ₦350,000	uPVC or aluminium, including brackets and labour.
First-flush diverter and leaf filter	₦45,000 – ₦180,000	Essential for keeping stored water clean.
Storage tank (2,500 litres)	₦180,000 – ₦380,000	Poly tank; underground concrete costs more.
Storage tank (10,000 litres)	₦600,000 – ₦1,300,000	Best value per litre for dry-season cover.
Pump and pressure set	₦150,000 – ₦600,000	Needed to feed taps, cisterns or irrigation.
Full filtered household system	₦1,500,000 – ₦4,000,000	Gutters, diverter, tanks, pump and UV/carbon polishing.

Ranges reflect quotes commonly seen on SustifyHomes across Nigerian states. Final pricing depends on site conditions and equipment availability.

Rainwater harvesting calculator

Estimate how much rain your roof can capture.

Roof catchment area (m²)

Average monthly rainfall (mm)

Dry days to cover (days)

Monthly harvest: 15,300 litres
Recommended tank: 15,300 litres
Yearly potential: 122,400 litres

Indicative project budget

₦3,546,000 – ₦5,142,000

Estimate only. Verified providers confirm the final quote after a site assessment.

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What changes the price

Roof area and material

Yield scales directly with catchment area. Metal and tile roofs collect cleaner water than asbestos or thatch.

Dry-season length

Northern states need far more storage per litre of demand than the south because of longer dry spells.

End use

Flushing and irrigation need only filtration; drinking-quality water adds UV or RO polishing and lifts cost.

Tank siting

Underground cisterns cost more to build but save space and keep water cooler; overhead tanks need a stand.

Frequently asked questions

Is rainwater harvesting worth it in Nigeria?: In high-rainfall states it commonly replaces most non-drinking water use, cutting tanker and pumping costs. Payback on a basic system is typically two to four years.
Can I drink harvested rainwater?: Only after filtration and disinfection. Add a first-flush diverter, sediment and carbon filtration and UV treatment before any drinking use.
What tank size do I need?: Size it against the dry days you want to cover. The calculator on this page converts your roof area and local rainfall into a recommended tank volume.
Does it work with an existing borehole?: Yes. Most homes use rainwater as the primary wet-season source and fall back to the borehole in the dry season, which extends pump life.

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