Pollution Source Assessment Tool

Pollution Source Assessment Tool

What is it?

The Pollution Source Assessment Tool (PSAT) is a geographic information system that brings together data on the sources, causes and pathways for pollutants.

We use PSAT to understand where the high risk pollution sources are in the catchment. This allows us to prioritise our catchment actions to protect water quality.

How is it used?

PSAT is used to pinpoint the most significant potential sources of primary pollutants in our catchments. It aims to:

  • improve our knowledge of pollution source risks in the catchments
  • increase our confidence in the scientific methods we use to assess the risk of key pollution sources and types
  • inform our strategic priorities for catchment management.

PSAT map

Assessing risks using PSAT

PSAT uses technical information, spatial data, modelling, expert knowledge and best management practices to analyse the relative risk of four priority pollutants (nitrogen, phosphorus, pathogens and suspended solids) that may impact on local waterways.

Risks are assessed against 14 land use activities or "modules" which cover most of the significant pollution sources in the catchment:

  1. Grazing
  2. Gully erosion
  3. Horticulture and cropping
  4. Intensive animal production
  5. Industry
  6. Landfills
  7. Mines and quarries
  8. Onsite wastewater management systems
  9. Roads
  10. Sewage treatment plants
  11. Sewers and pumping stations
  12. Streambank erosion
  13. Urban stormwater
  14. Forests

What have we learned so far?

The five most significant pollution sources for all priority pollutants are:

  1. grazing
  2. intensive animal production
  3. forests
  4. urban stormwater
  5. other urban landuses.


Saturday 02 July
2,529,499 ML
2,618,706 ML
8,828 ML
1,262 ML
5,351 ML
Saturday 02 July