Scheme performance

The Hunter River Salinity Trading Scheme has proved tremendously successful and is widely supported by the community that contributed to its creation.

The EPA administers the scheme with guidance from an operations committee with representatives of the community, industry and the government.

Scheme performance in 2018-19

Due to the dry weather, during 2018-19 the scheme participants had only one opportunity to discharge saline water in the Middle and Lower Sectors of the Hunter River. The potential discharge event occurred in April 2019, however no industries took the opportunity to discharge during this event.

Instead of discharging, the mines retained this low quality water to process coal and supress dust, keeping more good quality water in the Hunter for other uses such as agriculture, town water supply and power generation.

This map of the Scheme shows the three sectors of the Hunter River, and the associated compliance levels for 2018-19. Each sector was 100% compliant with the salinity goal.

map showing the three secotrs of the HunterRiver and the associated compliance levels for 2018-19

Scheme performance reports

Each year the EPA assesses the performance of the scheme and produces a report.

Longer term scheme performance

While the scheme operates to manage salinity levels in the river as a result of industry discharge, occasional exceedances still occur, caused by diffuse sources of saline runoff. New mines can readily be granted discharge licences, with significant economic and employment benefits for the valley.

However since the scheme started, river salinity has more consistently been below the salinity target.

These improvements have occurred despite a drier-than-average weather pattern since the scheme began. The graph below shows that in previous dry spells (early 1980s and around the turn of the decade) salinity levels were very high. These have not been repeated during the time the scheme has been in operation (which has been similarly dry).

Hunter River Salinity Trading Scheme - electrical conductivity at Singleton

Electrical conductivity at Singleton 1980 to 2002

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