title: Golden Plains Domestic Wastewater Management Plan 2023 council: golden-plains state: vic category: infrastructure classification: MINOR status: unknown last_compiled: 2026-05-30 source_docs:

Att 7.5 Golden Plains DWMP 2023 FINAL.pdf

Golden Plains Domestic Wastewater Management Plan 2023

Golden Plains’ 2023 Domestic Wastewater Management Plan is not mainly a sewer infrastructure program; it is a risk-control framework for a municipality where most dwellings remain outside reticulated sewer areas and where growth pressure is increasing the number and concentration of onsite wastewater management systems. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.6) Its planning significance is that wastewater capacity becomes a practical settlement constraint: if a lot cannot treat and retain wastewater within its boundary, subdivision or dwelling development should not proceed unless sewer or an approved alternative is available. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.13)

Background

Golden Plains Shire sits between Ballarat and Geelong, had a population of 24,879, covered more than 270,000 hectares, and contained more than 9,000 dwellings at the time of the plan. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.9) Only three towns were identified as sewered: Bannockburn, Smythesdale and Enfield, and these sewered areas together covered less than 0.5% of the Shire. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.9) The plan estimated more than 8,500 onsite wastewater management systems across the Shire, up from 6,700 identified in the 2015 spatial risk assessment. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.16)

The plan is the third Domestic Wastewater Management Plan for Golden Plains Shire and was prepared after review of the 2015 plan. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.7) It responds to the Environment Protection Act 2017, Environment Protection Regulations 2021, EPA guidance and planning scheme requirements that place owner, occupier and council responsibilities around onsite wastewater design, installation, operation, maintenance, records and enforcement. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.11-12)

Analysis

Wastewater as a Settlement Constraint

The core mechanism is simple: where reticulated sewerage is not available, each dwelling must treat and retain all wastewater within the lot, and if that cannot be demonstrated, the land should not be subdivided for that use. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.13) This makes lot size, soil performance, slope, groundwater depth, flood exposure and proximity to waterways practical controls on residential development in unsewered towns. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.15-17)

The plan records strong growth pressure, with the Shire growing by more than 6,000 people since 2011 at 2.5-3% per year and annual growth forecast at 2-3% over the next 30 years. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.11) The same section forecasts 7,300-14,700 additional dwellings and 21,000-42,800 additional people by 2051, meaning the wastewater question is tied directly to the Shire’s settlement planning and Growing Places Strategy. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.11)

The plan identifies Low Density Residential Zone and Township Zone areas as higher concern because they combine existing onsite systems, smaller lots and growth potential. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.9) The main towns and localities in this risk group include Bannockburn’s unsewered surrounds, Teesdale, Inverleigh, Lethbridge, Meredith, Batesford, Smythes Creek, Haddon, Scarsdale and Linton. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.9)

Risk Profile and Inspection Logic

The 2015 spatial risk assessment remains the base risk tool for the 2023 plan, using council records, sewer boundaries, potable water supply catchments, soils, topography, waterways and rainfall to classify existing and potential future onsite wastewater risk. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.15) The 2023 plan carries that assessment forward rather than replacing it, which means the plan’s operational quality depends heavily on whether the 2015 spatial data remains accurate after several years of growth. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.15-17)

The risk profile is materially uneven. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.16-17) About 75% of onsite systems were estimated to be on parcels larger than 1 hectare and generally lower risk, while about 820 systems, or 12%, were on parcels smaller than 0.4 hectares and correlated with older housing in Inverleigh, Teesdale, Lethbridge, Maude, Meredith, Rokewood, Linton and Scarsdale. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.16) About 17% of onsite systems were on parcels whose centroid overlaid high-risk soil types, 31% were on medium-risk soils and 52% were on low-risk soils, although the plan warns that broad soil mapping is not detailed enough to determine site-level land capability. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.16)

The inspection program is the main control action. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.20-22) Council proposes to select from up to 1,000 high-risk sites using four criteria: systems in the potable water supply catchment, systems on lots under 4,000 square metres in areas above 40 houses per square kilometre, systems on lots under 10,000 square metres with high-risk ASRIS soils, and systems in areas with groundwater depth under 5 metres and groundwater salinity under 1,000 mg/L total dissolved solids. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.20) The plan sets a reasonable target of inspecting 20% of high-risk sites, or 200 sites, each year, with at least 500 high-risk sites inspected over the life of the plan. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.20)

This inspection target is proportionate but incomplete as a risk-control mechanism. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.20-22) It prioritises the highest-risk systems, but it does not by itself resolve the underlying settlement issue where growth adds more onsite systems into locations already flagged for density, small lots or complaints. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.16-17)

Small Lots and Subdivision Control

The plan’s most important planning rule is the default 4,000 square metre minimum lot size for subdivision in unsewered areas, especially in Township Zone land where a mandatory minimum may not otherwise apply. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.26-27) The plan states that Council will continue to target lot sizes above 4,000 square metres for new subdivisions. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.27)

The 4,000 square metre default is not treated as automatically safe. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.27) For a 4,000 square metre lot, the plan applies controls including a maximum 15% land application area, a suitable onsite wastewater envelope, house size and water-reduction measures to achieve 750 litres per day wastewater generation, secondary treatment and drip irrigation with at least 375 square metres of land application area, increasing to at least 420 square metres where average rainfall exceeds 600 millimetres per year. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.27)

Existing small lots are a separate planning problem because subdivision controls cannot retrospectively enlarge them. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.27) The plan identifies existing vacant lots under 4,000 square metres in older towns such as Meredith and Linton, and states that new development on existing small lots reliant on onsite systems will be restricted to sites with evidence of better soil permeability or reduced wastewater generation through measures such as limiting house size or greywater reuse. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.27)

Township Risk Pattern

Meredith is the clearest candidate for escalation beyond ordinary onsite-system management. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.36-37) The plan identifies Meredith as high-risk because it has a relatively large Township Zone area near a tributary creek, historic and recent complaints about onsite systems discharging offsite, demand for growth, and recent infill development on small 2,000-3,000 square metre lots that increased onsite system density. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.36) The plan recommends that Council take steps toward a case for sewerage in Meredith, including confirming the highest-priority Golden Plains town for sewerage, gauging community support, engaging Barwon Water and, if successful, working toward a proposal in the next water plan. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.37)

Inverleigh is treated as a monitor-and-review case rather than an immediate sewer case. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.34-35) The plan records older housing, many small lots under 4,000 square metres, past effluent runoff issues and flood exposure near the Barwon and Leigh Rivers, but it also records that a stormwater study found poor Leigh River water quality without obvious signs of contamination from onsite wastewater failure. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.35) The plan therefore recommends ongoing monitoring of Inverleigh’s domestic wastewater risks and further action only where necessary. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.35)

Teesdale is a growth-pressure risk rather than a confirmed sewer-priority case. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.34) The plan records 10% population growth since 2016, recent greenfield growth on about 4,500 square metre lots, further Low Density Residential Zone growth potential, and a relatively high number of 2022 complaints about onsite systems in the Low Density Residential Zone. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.34) The plan also records lower soil, slope, groundwater and waterway proximity risks than other townships and past opposition to sewerage in Teesdale. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.34)

Lethbridge and Maude are identified as having existing high-risk systems within the inspection program, with Lethbridge experiencing recent infill and small-to-moderate greenfield growth near Geelong. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.35-36) Scarsdale, Linton and Rokewood are also included in the high-risk inspection program, but the plan presents them as lower-priority sewer candidates because of smaller scale, lower growth pressure or insufficient justification for sewerage. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.37-38)

Potable Water Supply Catchment

The potable water supply catchment is the most sensitive receiving environment in the plan. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.39-41) It includes the Moorabool River inner catchment within 3 kilometres upstream of the She Oaks Weir river offtake and part of the Upper Stoney Creek Reservoir inner catchment within 3 kilometres upstream of the reservoirs. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.39) The plan estimates about 57 existing houses in the open potable water supply catchment, with about 20-30 within the Moorabool River inner catchment. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.40)

The planning mechanism is stricter than elsewhere because Ministerial Guidelines for open potable water supply catchments generally seek no more than one dwelling per 40 hectares unless an exemption applies. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.14) The plan states that Barwon Water indicated it would not provide planning approval for developments under 40 hectares unless Council can demonstrate best-practice domestic wastewater management to reduce the risk from existing onsite systems in the inner catchment. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.40)

The plan also records that the private land in the catchment is zoned Farming Zone or Rural Conservation Zone Schedule 3, with subdivision minimums of 100 hectares and 60 hectares respectively. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.41) This means subdivision controls are broadly protective, but dwelling permits and onsite wastewater performance remain active risks where existing density already exceeds one house per 40 hectares in parts of the southern catchment. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.41)

Sewered Areas and Water Authority Dependencies

The plan identifies 10.3 square kilometres of sewered area across Smythesdale, Enfield and Bannockburn, equal to 0.4% of the Shire, leaving 2,695 square kilometres or 99.6% unsewered. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.31) Bannockburn is the largest sewer scheme at 6.7 square kilometres, Smythesdale covers 1.2 square kilometres and Enfield covers 2.4 square kilometres. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.31)

Two water corporations are relevant: Barwon Water in the south and east and Central Highlands Water in the north and west. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.9) The plan depends on data sharing with these water corporations to identify houses in sewered or sewerable areas that remain on onsite systems and to avoid new onsite systems where sewer connection is available. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, p.33)

Current Status

The source document is a March 2023 final report with an action plan assigning most implementation actions to 2023 and 2024. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.42-43) The available source does not confirm whether Council formally adopted the plan, whether the inspection program has commenced, or whether the Meredith sewerage case has progressed. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf)

Dependencies

Blocks: Further subdivision or dwelling development in unsewered areas where wastewater cannot be treated and retained onsite, particularly on small lots, high-risk soils, steep land, flood-prone land, shallow good-quality groundwater areas and potable water supply catchment land. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.13, 26-29, 40-41)
Blocked by: Accurate onsite-system records, resourcing for the inspection program, occupier consent for onsite inspections except where statutory entry exceptions apply, water corporation servicing priorities, and site-specific Land Capability Assessments. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.17-21, 28-29, 33)
Informed by: The 2015 DWMP spatial risk assessment, the 2015 land capability assessment manual, township structure plans, water quality studies and a 2022 pathogen risk assessment for the Moorabool River catchment. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.15, 24, 35-36, 40)
Implements: Local government responsibilities under the Environment Protection Act 2017, Environment Protection Regulations 2021, EPA guidance, Victorian Planning Provisions and open potable water supply catchment guidelines. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.11-14)
Conflicts with: Pressure for smaller-lot infill development in unsewered townships where onsite wastewater needs larger land application areas and buffers. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.25-27)

Cross-Jurisdictional Links

The plan is cross-jurisdictional because wastewater outcomes depend on Barwon Water, Central Highlands Water, EPA, Corangamite Catchment Management Authority and neighbouring growth pressures from Geelong and Ballarat. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.9, 19, 40) Barwon Water is especially important for Meredith, Teesdale, Inverleigh, Lethbridge, Maude and the potable water supply catchment because the plan records Barwon Water’s role in sewerage prioritisation, planning referrals and catchment protection. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.34-37, 40)

Gaps in This Analysis

This page is based on one source document, so several referenced primary documents remain analytical gaps. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf) The missing documents include the 2015 DWMP Volume 1, the 2015 DWMP Volume 2 technical reports, the Land Capability for Onsite Domestic Wastewater Assessment Manual, the Teesdale Structure Plan, Inverleigh Structure Plan Review, Meredith Structure Plan Review, the 2017 Meredith and Inverleigh surface water quality assessment, Barwon Water’s sewerage prioritisation policy and the 2022 Moorabool River pathogen risk assessment. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.7, 15, 24, 34-36, 40) Without those documents, this page can identify the mechanisms and risk hierarchy, but it cannot independently test the spatial risk model, water quality conclusions, lot-level constraints or water corporation servicing economics. (Source: Att 7.5 Golden Plains DWMP 2023 FINAL.pdf, pp.15-17, 35-37, 40)

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