Observed arrival · 2026-09-30
WaterBalanceCalc: a water-loss ledger
A free calculator for water utilities to build an IWA-standard water balance, estimate leakage and losses, and report costs, carbon, and uncertainty.
- For
- Water utility staff preparing loss balances
- Worth noticing
- Its sample assistant proposes a 4% meter under-registration estimate with a ±40% band and explains the reasoning.
Field notes
The workflow separates water sources, billed and unbilled consumption, apparent losses, and real losses, then uses mains, connections, service-pipe length, and pressure to estimate unavoidable leakage. Its worked example shows NRW at 29.3% and ILI at 3.07; the page also links country guides for 13 regions. The sample assistant response gives a 4% meter under-registration starting estimate with a ±40% band and explains why local meter age and low-flow losses matter.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue