Water balance by country · Updated 2026-09-29
Non-revenue water in Indonesia: PDAM water balances, the 20% national target and WB-EasyCalc
How Indonesian PDAMs calculate air tak berekening (NRW) with the IWA water balance, the national NRW target, BPKP performance audits, and running WB-EasyCalc files online in Bahasa-friendly units.
Calculator settings for Indonesia
- Units
- Metric
- Benchmark category
- Low & middle income
- Meter location
- Mostly at the house frontage; 2–5 m service pipe typical
- Supply
- Continuous in larger PDAMs; intermittent in many smaller ones
- Reporting
- PDAM performance evaluation (BPPSPAM/BPKP); national target NRW 20%; Kementerian PUPR
Indonesia's more than 400 PDAMs (regional water utilities) report non-revenue water — air tak berekening — through annual performance evaluations, against a long-standing national target of 20%. Actual levels average around 30–35% nationally with many PDAMs above 40%. WB-EasyCalc, available in Bahasa Indonesia, has been the standard calculation tool for years and is cited in BPKP audit reports and university studies across the archipelago.
Importing your EasyCalc file
If your PDAM already has a WB-EasyCalc workbook, use 'Import EasyCalc file' on the calculator page. The importer reads the System Input, Billed Consumption, Unauthorised, Meter Errors, Network, Pressure and Financial sheets directly, so last year's balance is on screen in seconds and can be saved as version 1 before you update it.
Indonesian specifics
- Customer meters are usually at the front of the property with a short service pipe: enter 2–5 m.
- Meter age is the dominant apparent-loss driver. PDAM fleets often include a large share of meters over 8 years old; bench tests in Indonesia commonly show 5–10% under-registration. Carry ±30–40%.
- Illegal connections and meter tampering are material in dense kampung areas. Field survey data from the PDAM's pengawasan team is the best source; without it, 1–3% of connections with ±50% is a defensible starting assumption.
- Pressure is often low (10–20 m) in gravity systems; choose the low-and-middle-income category so the bands are meaningful.
- Treatment is 'traditional' for IPA (conventional plants); spring and deep-well sources with chlorination only are 'basic'.
Typical results
PDAMs in band C or D on the ILI matrix are common, with real losses of 300–600 litres per connection per day. The good news is that these systems respond quickly to DMA formation and pressure management, and the calculator's what-if table lets you quantify a pilot zone's projected impact for the Bupati or the PDAM board in rupiah as well as cubic metres.