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Figure 10.2.4 Sewerage system overflows or leakages in discrete Indigenouscommunities, by usual population a, b10080Per cent604020050–99 100–199 200–499 500–999 1000 or morePopulation of communitya In the 12 months prior to the survey. b Data not collected in 'administered' communities with a population ofless than 50.Source: ABS 2006 CHINS, Cat. no. 4710.0; table 10A.2.5.• Figure 10.2.4 shows that between 23.5 and 52.6 per cent of discrete Indigenouscommunities (depending on the size of the community) experienced sewerageoverflows or leakages in the previous 12 months.• In 2006, 130 of the 322 discrete Indigenous communities with a population of50 or more (40.4 per cent) had experienced sewerage overflows or leakages inthe previous 12 months (table 10A.2.5).• In 2006, 142 communities reported sewerage overflows or leakages. Blockeddrains (95 communities) and equipment failure (62 communities) accounted forthe largest proportion of overflows and leakages. The total population incommunities affected by sewerage overflows or leakages was 30 140 people(table 10A.2.5).• Of the 142 communities that reported sewerage overflows or leakages,31 (21.8 per cent) had experienced 10 or more overflows or leakages in theprevious 12 months (table 10A.2.6).EFFECTIVEENVIRONMENTALHEALTH SYSTEMS10.21