1. What is NWSDB Water Bill Calculation?

The NWSDB (National Water Supply and Drainage Board) water bill calculation estimates your monthly water charges based on consumption, fixed charges, tiered rates, VAT, and service charges as per Sri Lankan water billing policies.

2. How Does the Calculator Work?

The calculator uses the NWSDB water bill formula:

Where:

• Fixed Charge — Base monthly fee (LKR)
• Consumption — Water usage in units (1 unit = 1000 liters)
• Tiered Rate — Rate per unit based on consumption tier (LKR)
• VAT — Value Added Tax percentage (typically 12%)
• Service Charge — Additional service fee (LKR)

Explanation: The calculation follows the tiered pricing structure used by NWSDB, where different consumption levels may have different rates.

3. Understanding Water Bill Components

Details: NWSDB uses a tiered pricing system where the rate per unit increases with higher consumption levels. The first 0-5 units typically have a minimum charge of LKR 150 at LKR 30 per unit.

4. Using the Calculator

Tips: Enter your water consumption in units, fixed charge, service charge, tiered rate, and VAT percentage. All values must be valid non-negative numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the minimum charge for water consumption?
A: For the first 0-5 units, there is typically a minimum charge of LKR 150 at LKR 30 per unit.

Q2: How does the tiered pricing work?
A: Different consumption ranges have different rates per unit. Higher consumption tiers have higher rates to encourage water conservation.

Q3: What is included in the fixed charge?
A: The fixed charge covers basic service availability and maintenance costs regardless of consumption.

Q4: Can VAT percentage change?
A: Yes, VAT percentage is set by the government and may change over time. The default is 12% but should be verified with current regulations.

Q5: How often are water bills generated?
A: NWSDB typically generates bills monthly, based on meter readings taken during the billing cycle.