Water Bill Calculator Sri Lanka – NWSDB
Estimate your NWSDB water bill from monthly units used. Compare domestic and Samurdhi categories, with usage charges, fixed charges and VAT.
What this tool helps you do
Water Bill Calculator Sri Lanka – NWSDB lets you enter the relevant details and get a clear result or breakdown in your browser. Use it to compare realistic scenarios before taking the next step.
How to use it
- Enter or select the details requested by the tool.
- Review the result, breakdown and any assumptions shown on the page.
- Change one value at a time to compare another scenario.
Accuracy, privacy and limitations
Most calculations run locally in your browser. Results are practical estimates, so confirm important figures with the relevant provider or authority before relying on them.
NWSDB domestic water tariff used by this calculator
The calculator uses the NWSDB tariff effective August 21, 2024. One unit is one cubic metre, or 1,000 litres. The fixed charge comes from the highest usage block reached, and 18% VAT applies to usage plus the fixed charge.
| Monthly use | Rate per unit | Fixed charge |
|---|---|---|
| 0-5 units | Rs. 50 | Rs. 300 |
| 6-10 units | Rs. 70 | Rs. 300 |
| 11-15 units | Rs. 90 | Rs. 300 |
| 16-20 units | Rs. 100 | Rs. 400 |
| 21-30 units | Rs. 120-150 | Rs. 500-600 |
| 31-50 units | Rs. 170-195 | Rs. 1,500-3,000 |
| Above 50 units | Rs. 225-280 | Rs. 3,500-4,500 |
Example: 20 domestic units
For 20 domestic units, the usage charge is Rs. 1,550, the fixed charge is Rs. 400, and VAT is Rs. 351. The estimated total is Rs. 2,301.