Water supply for car washes in Ghana: GWCL, boreholes, tankers and storage

A pressure washer wash of a saloon car takes roughly 60 to 120 litres of water. A bucket and hose wash with a careless washer can take 200 or more. An SUV with a mud-caked underbody can take double that. Multiply by 25 cars a day and you are looking at somewhere between 2,000 and 5,000 litres before you have washed a single trotro.

Car wash water supply Ghana wide is the problem that shuts bays more often than any other. GWCL pressure drops to a trickle at midday, the tanker is late, the borehole pump trips, or the Poly tank was sized for ten cars a day and you now do thirty. The owners who never run dry are the ones who know their litres per car, have two sources, and store at least a day's water.

How many litres a car actually takes

Measure it once rather than guessing. Fill a known tank, wash ten saloon cars the way your washers normally do, and read the level. A good pressure washer with a trigger gun uses far less than an open hose, and a two-bucket method for the body uses less again.

Those numbers drive every other decision on this page: how big the tank, how much tanker water to order, and what GWCL will bill. They also show you where water is being wasted, which is the cheapest saving in the business and covered in Cutting car wash costs without cutting corners.

GWCL on a commercial meter

If Ghana Water Company Limited pipes reach your site, a metered connection is usually the cheapest water per litre. A car wash is normally billed as a commercial customer, at rates higher than domestic ones, and the tariff bands are revised from time to time by the regulator. Ask GWCL's district office for the current commercial tariff and the connection cost, which depends on how far you are from the main; do not rely on a figure from a neighbour's bill.

The catch is reliability, not price. In many parts of Accra, Kumasi and Takoradi, supply is rationed by area and day, and pressure during working hours can be too low to fill a tank. Treat GWCL as a source that fills your storage overnight, not as a tap you wash from directly. A float valve on the tank inlet means it fills whenever supply comes without anyone watching it.

What a borehole actually costs, and the permit

A borehole gives you independence from rationing and tankers, and for a busy wash it often pays for itself within a few years. Drilling, casing, a submersible pump, the control box and plumbing to the tank commonly come to GH₵15,000 to GH₵45,000 in 2026, and it varies a great deal with depth, rock, region and how far the driller has to travel. Coastal sites can hit salty water; parts of the north and the Volta Region need deeper holes. Get a hydrogeological survey before you pay a driller, and get two quotes.

Groundwater in Ghana is regulated by the Water Resources Commission, which generally expects commercial users to obtain a permit for drilling and abstraction, and drillers themselves are supposed to be licensed. Requirements and fees have changed over the years, so confirm with the Commission's office before drilling. Your Assembly and the EPA may also have views on a borehole at a car wash because of run-off, which is the subject of Recycling water and staying on the right side of the EPA.

Tanker water: the price swings

Tanker water fills the gap for washes with no GWCL supply and no borehole, and as a backup for everyone else. A tanker delivery of a few thousand litres in Accra might be GH₵150 to GH₵500 depending on the volume, the distance and the season; it varies, and in the dry months prices climb when demand spikes.

Three habits keep tanker costs sane. Know a reliable driver by name and phone and pay promptly so you are first on his list when water is scarce. And ask where the water comes from; some tankers fill from streams or unlined dugouts, and silt will clog your pump filter and leave marks on cars.

Sizing Poly tanks and choosing a pump

Store at least one full day's water, and two if you rely on tankers. For a wash doing 25 cars a day at an average of 100 litres, that is 2,500 litres a day, so a 5,000 litre tank or two 2,500s. Poly tanks are sold by litre capacity and prices vary by brand and town; a 5,000 litre tank commonly sits in the GH₵3,000 to GH₵6,000 range in 2026, and larger ones scale up.

Put the tank on a stand of two to three metres if you can afford the steel or block work. Gravity gives you a usable flow to buckets and hoses when the power is off, which matters more than it sounds during dumsor, as explained in Running a car wash through dumsor. For the pressure washer, a small booster or surface pump of around 0.5 to 1 horsepower feeding from the tank is the usual setup; the pressure washer needs a steady inlet flow, and starving it is a quick way to kill the pump.

A car wash water supply that never runs dry

The washes that never close for water have at least two of the three sources: GWCL filling overnight with a tanker number saved for the dry weeks, or a borehole with a tanker backup for pump failures.

Your next step is the measurement in the first section. Fill the tank, wash ten cars, read the level, and write the litres per car on the kiosk wall. Every decision after that gets easier.