Contact Harris Environmental Consulting for your on-site wastewater, stormwater, erosion & sediment control or bushfire assessment needs.

02 4236 0954
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        • Subdivisions

        • Whenever a boundary is altered (made smaller or changed) in a residential or rural residential area planning controls for subdivision is required (if two or more existing lots are consolidated this is not considered a subdivision).

        • Rezoning Reports

        • Bushfire Assessments are prepared as part of a rezoning in a bushfire prone area.

        • Infill Development

        • An Infill Development involves new house, alterations and additions in pre-existing subdivisions.

        • Special Fire Protection Purpose Developments

        • Any proposals involving schools, hospitals, bed and breakfast accommodation, eco-tourism, housing for older people, retirement villages, childcare centres, music festivals are considered particularly vulnerable during bushfires and are therefore required to meet some specific requirements. In particular, an emergency/evacuation plan is considered an important component of the strategy to plan for any bushfire risk. The consent authority is the local council but only after the RFS has issued a BUSHFIRE SAFETY AUTHORITY.

        • Complying Development

        • Check your 149 certificate to see if you need a Bushfire Attack Level (BAL) risk assessment.

  • Water Cycle Management Studies
  • On-Site Waste Water Management
  • Floating Wetlands
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On-Site Waste Water Management

Harris Environmental are On-site Wastewater Management specialists. On-Site Wastewater Management systems are used to treat on-site wastewater where there is no available reticulated sewer.

On-site Wastewater Assessments are required for domestic and non-domestic wastewater management, including:

  • Existing domestic wastewater management system needing to be upgraded, replaced or moved.
  • Residential development in un-sewered areas, including new dwellings, granny flats or secondary dwellings.
  • Commercial developments such as function centres, restaurants, places or worship, schools and childcare centre.s
  • New development that will be sewered, yet Council requires the DA to demonstrate compliance with on-site wastewater management regardless of future connection.
  • Subdivision or boundary adjustment, where a new lot is created or the existing wastewater management system is compromised.
  • Non-domestic wastewater management for mushroom farms, intensive horticulture, poultry farms, dog boarding kennels, wineries, micro breweries & cideries and intensive equine developments.
  • Tiny homes, eco-tourism, eco development and glamping developments.
  • Alternative wastewater management systems including worm farm, reedbed, compost toilets, greywater-management systems.

What Harris Environmental Offer

With over 20 years’ experience we specialise in:

    • Wastewater Management Reports: Single lots, Subdivisions, and Commercial Developments

    • Change in Residence/Dwelling Reports: (Additional Bedrooms, added dwellings or Granny flats)

    • Designs to meet WaterNSW NorBE requirements

    • Audits of existing systems for status and compliance

    • Expert witness for LEC and peer review

    • Designs for environmentally sensitive / constrained sites

    • Preliminary site investigation and options reports

    • Solutions for environmentally sensitive and unique locations

    • Viral die-off modelling

    • All treatment and disposal systems, including septic tank & trench, AWTS & irrigation and Wisconsin Sand Mounds.

    • Reports for pumpout where on site wastewater management is not an option

Getting a Quote

To get a quote:

So we can provide a quote, it would be helpful if you could email any relevant information, including:

  1. Floor plans and site plans
  2. Other development that is not shown on plans, such as sheds, pools, secondary dwellings and driveways.
  3. Other relevant reports such as biodiversity/ecologist reports, flood studies etc
  4. Relevant council correspondence if instructed to upgrade or replace a failing OSSM
  5. Existing wastewater report for existing OSSM
  6. Contour survey (as DWG if available)
  7. What is the available water supply, ie town, tank only, or bore for potable use.
  8. Name of applicant to be shown on report, or project manager if preferred.
  9. Preferred method of wastewater treatment and disposal.
  10. Preferred location of wastewater treatment system and disposal area.

Once the quote has been accepted:

  1. After we are commissioned to do the report, we will need to undertake the soil and site assessment. This includes the geotechnical soil assessment of the preferred Effluent Management Area. This assessment examines soil physical characteristics and samples are taken away for other tests as required.
  2. After our desktop and site assessment, we will send you preliminary site plans that show the size and location for wastewater disposal, with due consideration of your requirements and the assessment guidelines we must follow to obtain Council approval on your behalf.
  3. On your acceptance, we will then prepare the final report. The whole process should take 10-15 working days to complete after we are commissioned.
  4. You will need to provide Council with the specifications of the proposed treatment system and Section 68 application form. The manufacturer can provide this information, or you can find this on the NSW Health website.


Our Service Includes

  • Easy to read reports, tailored to suit the owner, consent authority and installer.
  • Preliminary advice that may be needed to adjust the development proposal to best meet the site constraints.
  • On-going consultation with the clients to best meet expectations of the preferred method of wastewater treatment and disposal and location within the property
  • Easy to interpret CAD drawn site plans using NEARMAP aerial photography
  • Soil texturing investigations
  • An interdisciplinary team of environmental scientists and engineers that can also provide stormwater (WCMS), erosion and sediment control plans (ESCP) and bushfire hazard assessments
  • Compliance with WaterNSW, AS/NZS 1547:2012 and local Council regulations (we work in more than 20 LGA's across NSW)
  • Preliminary discussions with the owner(s) to discuss options where they are available and requested
  • GIS assessment of site attributes (Biodiversity, Contours, Soil Landscapes, Groundwater Bores, Salinity, Geology, Topography, Watercourses, Acid Sulphate Risk)
  • Independent advice and recommendations
  • Network with suppliers of domestic and commercial wastewater treatment systems, plumbers and irrigation installation specialists
  • Network with other professionals that we can direct you to, including hydraulic engineers, contaminated land consultants, ecologists, archaeologists, town planners etc
  • Fixed quotes and prompt turnaround times.

Commercial on-site wastewater management

Our commercial wastewater management projects include domestic and non-domestic wastewater management. Domestic includes childcare centres and schools, function centres and tourist developments. Non-domestic includes mushroom farms, intensive horticulture, poultry farms, dog boarding kennels, wineries, micro breweries & cideries and intensive equine developments. These assessments are subject to additional assessment criteria, soil testing and design work. The domestic wastewater management systems often require installation of commercial treatment systems (Sewage Management Facility) where wastewater strength and volume exceeds the capacity of larger domestic systems (AWTS). Non-domestic wastewater management systems can also use commercially available treatment systems, but are more often designs that that are tailored to suit the specific pollutants of concern.

Some examples of our work:

  • Cobbitty Child Care Centre at Cobbitty
  • Meeks Day Care at Berkshire Park
  • Nepean Christian School at Mulgoa
  • Allied Mills at Picton
  • Berkelouw’s Book Barn/Bendooley Estate at Berrima
  • Cupitts Winery at Ulladula
  • Crooked River Winery at Gerringong
  • Mountain Spring Monastery at Bilpin
  • Murray Riverside Village at Tocumwal
  • Zen Oasis at Medway
  • Willinga Park Equestrian Centre at Bawley Point
  • Bellfield College at Rossmore
  • Bilpin Cider at Bilpin
  • The Woods Farm at Tomerong
  • BAPS Hindu Temple at Kemps Creek
  • Hubertus Re-development for Blacktown Workers Club
  • Glenbernie Orchard at Darkes Forest
  • Ampol redevelopment at Pheasants Nest
  • 45 lots subdivision for Bangadilly, Canyonleigh, Wingecarribee LGA / Sydney Water Drinking Catchment, 45 lots
  • 43 lots for Tangalla at Tapitallee, Shoalhaven LGA

Call Harris Environmental
on 02 4236 0954
to discuss your project

Recent Projects

Sydney Water Picton Sewage Treatment Plant - Trial
Upgrade to Spray Irrigation from Septic Tank

This Equestrian Centre with a residential dwelling and amenities for workers had been utilising a septic tank and trench, the system had failed and upgrade was needed.

Ropes Crossing Floating Wetland
Sydney Olympic Park Authority Northern Water Feature

Case Studies

Contact us

We'd love to hear from you

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