Sewage treatment and monitoring
Review of Environmental Monitoring Programs - Dubbo Sewage Treatment Plant, Ballimore and Wongarbon (Pine Avon)
Review of Environmental Monitoring Programs (PDF 1.3MB)
OPERATIONAL ENVIRONMENTAL MANAGEMENT PLAN FOR SEWERAGE SERVICES
Council provides sewerage reticulation and treatment services to 32,537 Dubbo residents and 687 Wongarbon residents. Sewage is transferred from the residential properties, through a series of pipelines and pump stations to the Dubbo and Wongarbon Sewage Treatment Plant.
An Operational Environmental Management Plan (PDF 1MB) has been prepared to document the following:
- Regulatory requirements
- Management system components including reporting, document control, training, complaints and review, and
- Environmental risk identification, monitoring and management strategies associated with the sewer operations.
ENVIRONMENTAL DISCHARGE MONITORING
Dubbo Regional Council's Sewage Treatment Plants are licenced by the NSW Environment Protection Authority.
Dubbo Sewage Treatment Plant - EPA Licence 3850 (PDF 143.7KB)
Wellington Sewage Treatment Plant - EPA Licence 3370 (PDF 140.6KB)
Effluent leaving the Sewage Treatment Plants are monitored in accordance with the terms of the licence. Licencees 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.
Dubbo Sewage Treatment Plant
The Dubbo Sewage Treatment Plant has two discharge points. The documents below refer to Point 1, which is the point of discharge to the Macquarie River. The monitoring frequency for this point is weekly when it is necessary to discharge effluent to the River.
Sewage Treatment Plant Point 1 - 2019/2020 (PDF 133.1KB)
Sewage Treatment Plant Point 1 - 2018/2019 (PDF 133.1KB)
Sewage Treatment Plant Point 1 - 2017/2018 (PDF 243.4KB)
Sewage Treatment Plant Point 1 - 2016/2017 (PDF 249.3KB)
Sewage Treatment Plant Point 1 - 2015/2016 (PDF232.8KB)
Point 2 refers to monthly discharge of effluent to effluent irrigation. The licence does not state acceptable ranges for pollutants at this Point. Note that fewer pollutants are required to be monitored at Point 2 as compared to Point 1.
Sewage Treatment Plant Point 2 - 2019/2020 (PDF 104KB)
Sewage Treatment Plant Point 2 - 2018/2019 (PDF 103KB)
Sewage Treatment Plant Point 2 - 2017/2018 (PDF 192.6KB)
Sewage Treatment Plant Point 2 - 2016/2017 (PDF 204.3KB)
Sewage Treatment Plant Point 2 - 2015/2016 (PDF190KB)
WELLINGTON Sewage Treatment Plant
The Wellington Sewage Treatment Plant has three discharge points. The documents below refer to Point 1, which is the point of discharge to Bushranger Creek. The monitoring frequency for this point is monthly.
Wellington Sewage Treatment Plant Point 1 - 2019/2020 (PDF 120.2KB)
Wellington Sewage Treatment Plant Point 1 - 2018/2019 (PDF 117.8KB)
Wellington Sewage Treatment Plant Point 1 - 2017/2018 (PDF 231.3KB)
Wellington Sewage Treatment Plant Point 1 - 2016/2017 (PDF 207.8KB)
Wellington Sewage Treatment Plant Point 1 - 2015/2016 (PDF 196.1KB)
Point 3 is the discharge downstream, and Point 4 upstream of the confluence of Bushranger Creek and the Macquarie River. The monitoring frequency for both points is yearly.
Wellington Sewage Treatment Plant Point 3 & 4 (PDF 107.8KB)
Pollution Incident Response Management Plan (PIRMP)
Council has developed Pollution Incident Response Management Plans which will guide Council's response in the event of any pollution incidents that may occur at the Dubbo Sewage Treatment Plant (PDF 615.6KB) and Wellington Sewage Treatment Plant. (PDF 135.4KB)
The following table indicates some parameters of sewage received at the Dubbo Sewage Treatment Plant, called "influent", and the quality of the water after treatment, when it leaves the plant, called “effluent”.
|| Typical Effluent
|BOD – 5 Day
|Ammonia – N
|Nitrogen – Oxidised
|Nitrogen – Total Kjeldahl
|Nitrogen – Total
|Phosphorus – Total
|Oil and Grease
The unit “cfu/100 mL” refers to the number of colony forming units in a 100 millilitre sample. It is a biological measure of viable bacterial cells in the water.
Electrical conductivity is measured in units of micro Siemens per centimetre (µS/cm). It is an indication of the amount of nutrient, impurities or salts in solution.
Last Edited: 18 May 2020