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Northern Ireland Water (NI Water) supplies water and sewerage services to Northern Ireland businesses. It also sets the charges based on usage or property value.

Types of water charges for businesses

Metered water charges for businesses

If your business has a water meter, you pay a fixed standing charge based on your supply pipe size plus a variable charge depending on the actual water used. For more information, see .

Unmetered water charges for businesses

If you do not have a water meter, charges are based on your property's rateable value plus a standing charge. For more information, see .

Domestic allowance for eligible businesses

Businesses that pay business rates may qualify for a domestic allowance of 100m³ of water every six months. This allowance reduces your metered water bill but cannot be carried over to the next billing period. To apply for the domestic allowance, and provide proof of your rateable status. 

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Assessed water charges for non-metered properties

If installing a water meter isn't possible, you can request an assessed charge. This includes a standing charge and a variable charge calculated from the water-using appliances on your property. Domestic allowance may also apply here if you pay business rates.

Large user tariff

Large water users may qualify for a reduced tariff reflecting lower service costs. Contact NI Water to see if your business qualifies. For more information, see .

Regulation of water charges

The oversees water and sewerage charges in Northern Ireland. It sets limits on price increases, monitors service quality, and ensures fair pricing for all customers.

Using non-mains water sources

If your business uses water from wells, boreholes, or reservoirs, you must notify NI Water. You may need permission from the Northern Ireland Environment Agency to abstract or impound water. This helps ensure your sewerage charges are calculated correctly. See .

How to reduce your water and sewerage costs

Lowering your water use can reduce your bills. You can reduce water use by:

• monitoring your water meter regularly
• identifying and fixing leaks promptly
• installing water-efficient appliances and fixtures
• considering water reuse or alternative sources like rainwater

For further tips and ideas on how to reduce water use in your business, see reduce your water, sewerage, and effluent costs and .