Council Sewage

The goal of Council is to provide an efficient and effective sewerage service to Nyngan.
The original Nyngan scheme was constructed in the 1950s and consisted of gravity reticulation, gravity trunk mains, two major and minor pumping stations, one major rising main and two minor rising mains and a conventional sedimentation and trickling filter treatment works.
Augmentation of the original scheme was completed in 1991 and consisted of sewering previously subdivided north eastern areas which had septic tank on-site disposal, and the construction of a new pumping station, rising main and replacement of the existing treatment works with an oxidation pond system adjacent to the existing sewage treatment works. The ponds are located 1km from Nyngan on the Colane Road, beyond the town's levee banks.
The oxidation ponds consist of three large shallow ponds, constructed of earth embankments. Raw sewerage is stabilised within the ponds by the natural photosynthetic process of algae in conjunction
with the oxidation processes of bacteria. Disposal of the treated effluent is by flood irrigation on adjacent land.

The Nyngan Sewage Treatment Plant is licenced by the NSW Environment Protection Authority. The licence number is 3298.

Nyngan Sewage Treatment Plant Environment Protection Licence

For more information about licences, go to the  NSW EPA Website

Effluent leaving the Nyngan Sewage Treatment Plant is monitored in accordance with the terms of the licence. Licensees are required to publish pollution monitoring data that has been collected as a result of a licence condition, in accordance with section 66(6) of the POEO Act and written requirements issued by the EPA.
The Nyngan Sewage Treatment Plant has two discharge points which are monitored quarterly. DP1 at the Effluent Reuse Pond inside the Aerodrome and DP2 at the centre of the pivot on the property "Laravoulta".

There are 5 ground water monitoring points (MB1 – MB5) which are monitored quarterly with 3 soil monitoring points (SL1 – SL3) which are monitored annually. A further 3 soil monitoring points (SA1 – SA3) inside the Aerodrome which are monitored annually if the site is used for irrigation.
A site plan of the monitoring points can be viewed here (PDF 159.6KB)

STP 24/25 test results (PDF 585.5KB)

Council has developed a Pollution Incident Response Management Plan (PIRMP) that will guide Council's response in the event of any pollution incidents that may occur at the Nyngan Sewage Treatment Plant.

The PIRMP and supporting document for the Nyngan Sewage Treatment Plant can be viewed below.

ACKNOWLEDGEMENT OF COUNTRY

Bogan Shire Council acknowledges the Traditional Custodians of the land on which we gather, the Wongaibon people.
We acknowledge that Bogan Shire covers the Wongaibon, Ngiyampaa, and Weilwan Nations.
We pay our respects to their Elders past, present, and emerging. We extend this respect to all Aboriginal and Torres Strait Islander peoples present today.