The NSW Department of Planning, Industry and Environment (DPIE) announced that there is now enough water resource to allocate to general security entitlement holders.

This is the first allocation since August 2017.

In the DPIE's water allocation statement, it was noted that high security entitlement will increase by 0.10 megalitres per unit share for a cumulative allocation of 100 per cent for the current water year.

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General security entitlement will increase by 0.50 megalitres per unit share in the Upper Namoi, for a cumulative allocation of 50 per cent for the current water year.

General security entitlement will also increase by 0.042 megalitres per unit share in the Lower Namoi, for a cumulative allocation of 4.2 per cent for the current water year.

It comes after average rainfall during August, where the Namoi Valley received about 25-100mm.

"Net inflow into the storages during this period was about 1.7 gigalitres (GL) for Split Rock Dam and 28 GL for Keepit Dam," the DPIE statement read.

"Split Rock and Keepit storage volumes increased by approximately 1.4 GL and 27.2 GL respectively.

"Catchment conditions continue to improve in response to periodic rainfall, producing reasonable streamflow responses and connectivity to the Barwon River."

Split Rock Dam is sitting at 4.9 per cent, holding about 23,000 megalitres, as at Tuesday afternoon.

Keepit Dam is at 24.8 per cent, holding about 111,000 megalitres.