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Table 2

International Non-revenue Water Assessment Matrix

NRW management performance category
Non-revenue water in liters/connection/day When the system is pressurized at an average pressure of:
10 m20 m30 m40 m50 m
High income countries A1  <50 <65 <75 <85 
A2  50–100 65–125 75–150 85–175 
 100–200 125–250 150–300 175–350 
 200–350 250–450 300–500 350–650 
 >350 >450 >550 >650 
Low and middle income countries A1 <55 <80 <105 <130 <155 
A2 55–110 80–160 105–210 130–260 155–310 
110–220 160–320 210–420 260–520 310–620 
220–400 320–600 420–800 520–1,000 620–1,200 
>400 >600 >800 >1,000 >1,200 
NRW management performance category
Non-revenue water in liters/connection/day When the system is pressurized at an average pressure of:
10 m20 m30 m40 m50 m
High income countries A1  <50 <65 <75 <85 
A2  50–100 65–125 75–150 85–175 
 100–200 125–250 150–300 175–350 
 200–350 250–450 300–500 350–650 
 >350 >450 >550 >650 
Low and middle income countries A1 <55 <80 <105 <130 <155 
A2 55–110 80–160 105–210 130–260 155–310 
110–220 160–320 210–420 260–520 310–620 
220–400 320–600 420–800 520–1,000 620–1,200 
>400 >600 >800 >1,000 >1,200 
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