About the project

The Forrest township relies on privately-owned septic systems, which are currently exceeding capacity and struggle to cope with peak periods, school holidays and large events.

The main issues include frequent episodes of unpleasant odours, which are prominent during peak periods, and untreated wastewater leaking onto public and private properties.

Barwon Water is working on the business case assessing the replacement of privately-owned septic systems with a reticulated town wastewater system. Over the last two years, we have prepared a detailed concept design for the proposed solution. This work included land suitability assessments, public health and environment risk assessments, design of key project components such as the pressure sewer network and water recycling facility and preparation of a detailed cost estimate.

Work to develop a detailed business case for the project will include an updated economic assessment, and is due to be completed by mid-2026. This includes further assessment of the public health and environmental risks, understanding expected growth in the town and continued engagement to understand community views.

Subject to approval of Barwon Water's business case - that importantly secures an affordable outcome for all – the next stage would involve developing detailed designs of the sewer network, onsite pressure units and water recycling facility.

The proposed solution would involve replacing onsite septic systems with a pressure sewer system to service the Forrest township, with wastewater being sent to a local water recycling facility at Gerangamete. This would enable us to treat and re-use the recycled water.

The Forrest Wastewater Project aims to implement a wastewater management solution that:

• eliminates the public health and environmental risks associated with inadequately performing septic systems;
• removes the maintenance burden of existing onsite systems;
• improves Forrest’s amenity, creating better experiences for residents and visitors; and
• provides enabling infrastructure that will assist Forrest to become a thriving and vibrant township with increased economic activity through tourism, and sustainable development.

Business case assessment

The following elements will be considered when assessing the viability of the business case:

Quantifiable metrics

• Evidence of lower public health and environmental risks in Forrest, including reduced odours and visible discharge
• Demonstrated whole of community support
• Whether the project will contribute to improved amenities and visitor experiences that enable Forrest to be a viable alternative entrance to the Great Ocean Road
• Whether the project will contribute to a thriving and vibrant township within the Otways region

Non-quantifiable metrics

• Whether the project will support improved socio-economic outcomes, i.e. will a sustainable wastewater management system allow the region to reach its full economic and population potential.

• Whether the project will support increased tourism. i.e. Improved amenities and visitor experiences as residents and businesses expand their tourism offering.