On-site Sewage Management Systems Risk Assessment Criteria

• Site conducted

  Select

• Conducted on

  Date

• Prepared by

• Address

• Property File Number

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• 1. Area of property

  Less than 1.0 ha HIGH

  1.0 to 4.0 ha MED

  4.0 ha and above LOW

• 2. Distance from disposal area to nearest body of water

  Select Less than 100 metres from a permanent waterway, or 40 metres from a dam or intermittent waterway HIGH 100 to 200 metres from a waterway MED More than 200 metres LOW

  • Less than 100 metres from a permanent waterway, or 40 metres from a dam or intermittent waterway HIGH
  • 100 to 200 metres from a waterway MED
  • More than 200 metres LOW

• 3. Distance from disposal area to boundaries

  Select Less than 12m if area uphill and less than 6m if area downhill HIGH Otherwise LOW

  • Less than 12m if area uphill and less than 6m if area downhill HIGH
  • Otherwise LOW

• 4. Landfall/slope

  Select More than 20% (1 in 5) HIGH Less than 20% but more than 10% (1 in 10) MED Less than 10% LOW

  • More than 20% (1 in 5) HIGH
  • Less than 20% but more than 10% (1 in 10) MED
  • Less than 10% LOW

• 5. Nearest bore or well used for domestic water supply

  Select Less than 200 metres HIGH More than 200 metres but less than 300 metres MED More than 300 metres LOW

  • Less than 200 metres HIGH
  • More than 200 metres but less than 300 metres MED
  • More than 300 metres LOW

• 6. Arrangements for stormwater diversion

  No diversion HIGH

  Partially diverted MED

  Fully diverted LOW

• 7. Disposal method

  Select Surface disposal- HIGH Subsurface disposal, no geotech report- MED Subsurface disposal, with geotech report- LOW

  • Surface disposal- HIGH
  • Subsurface disposal, no geotech report- MED
  • Subsurface disposal, with geotech report- LOW

• 8. Proximity to human activity (eg recreational lawn areas, children's play, food gardens)

  Select Less than 6m if area is uphill and 3 m if area is downhill HIGH 6 —20 m MED More than 20m LOW

  • Less than 6m if area is uphill and 3 m if area is downhill HIGH
  • 6 —20 m MED
  • More than 20m LOW

• 9. Topographical position on slope

  In overland flow path HIGH

  Other LOW

• 10. Development serviced by system

  Select Other than single private dwelling HIGH Infrequent use (eg low load systems servicing sports facilities) MED Single private dwelling LOW

  • Other than single private dwelling HIGH
  • Infrequent use (eg low load systems servicing sports facilities) MED
  • Single private dwelling LOW

• 11. In 1% AEP flood zone

  Property inside HIGH

  Property outside LOW

• 12. Water source for domestic use

  Reticulated town supply HIGH

  Bore, dam MED

  Rainwater tanks only LOW

• 13. Surface water

  Present in disposal area HIGH

  Not present LOW

• 14. Soil erosion

  Select Present in or near disposal area HIGH Not present LOW

  • Present in or near disposal area HIGH
  • Not present LOW

• 15. Location

  Select Less than 2km upstream from the Water Filtration Plant HIGH Less than 5km upstream from the Water Filtration Plant MED More than 5km upstream from the Water Filtration Plant LOW

  • Less than 2km upstream from the Water Filtration Plant HIGH
  • Less than 5km upstream from the Water Filtration Plant MED
  • More than 5km upstream from the Water Filtration Plant LOW

Sign Off

• Risk rating

  HIGH (2 year approval)

  MEDIUM (5 year approval)

  LOW (8 year approval)

• Officers signature

  Sign

• The property/system is assigned the appropriate risk if it satisfies one or more criteria. In the case where the property may fall into two categories the higher risk category will prevail.

• Properties with two or more good inspection reports may be placed in a lower risk category.