Water quality is one indicator of how well the environment is faring in a particular area.
In September 2006 LEG commenced monitoring water quality in the Coxs River and all major tributaries, from its birthplace in Ben Bullen State Forest to about 40 kilometres downstream in the Kanimbla Valley.
The aim was to measure how development in the Lithgow area was affecting water quality over that distance.
This has shown that a small regional centre with a population of just 20,000 people can have a marked impact on water quality within a catchment.
Some disturbing data has been recorded at various sites, such as:
LEG is one of 250 groups that are involved in the StreamWatch programme.
The groups are monitoring the health of the state's waterways at some 600 sites.
The sites that LEG is monitoring are shown on this map (96KB PDF).
The collected data is shown in this document (428KB PDF). The data is added to the StreamWatch database.