On-site sewage management
For further information contact an Environmental Officer on 6549 3700 during business hours.
On-site Sewage Management Strategy
(OSMS) (148kb)
OSMS Application guidelines (65kb)
OSMS1 and OSMS2 application forms (172kb)
Environmental and Health Protection
Guidelines: On-site sewage management
for single household.
AS/NZS 1547:2000 On-site domestic
wastewater management.
Simplified sizing calculator (49.5kb)
DCP Section 23 - Onsite Wastewater
Management Systems.pdf (153kb)
Work as executed form (137kb),
WAE sample (133kb)
If you live in a house that is not connected to the main sewer, then chances are that your yard contains an on-site sewage management system. If this is the case then you have a special responsibility to ensure that your system is working well. Poorly maintained systems have the potential to significantly affect you and your family’s health, as well as the local environment.
Council's role
On-site sewage management facilities which are not operating correctly have the potential to create environmental disasters. In recognising this potential, the NSW government has enacted legislation that requires approval not only for the installation of systems, but for their continued operation.
Council’s On-site Sewage Management Strategy (OSMS) details the way in which this environmental issue will be dealt with.
The legislation requires systems to be approved by Council before installation and operation of the system.
In 2003 a Shire wide audit was conducted. Many systems were found to be in less than satisfactory condition. As owners brought their systems up to standard, an Approval to Operate was inferred on the system. These Approvals to Operate are valid for five years and many are due for renewal.
Council is undertaking another Audit throughout 2009 to ensure Council’s records are up to date and Approvals to Operate are current.
When it goes wrong!
If effluent is not being effectively absorbed into the soil, it can temporarily pond on the surface where it is accessible to children and pets, putting them into contact with potentially harmful bacteria and viruses. Rainwater runoff from effluent-saturated areas can reach waterways, carrying the contamination downstream to other users and increasing the nutrient loading. Hence effective monitoring of domestic wastewater treatment systems is vital to community and environmental health.
Muswellbrook Shire Council is in the process of implementing an Approval to Operate procedure for the Shire. This will involve regular inspections of on-site wastewater treatment systems to ensure the protection of community and environmental health.
Do’s and don’ts
Do
- Minimise water use in your household.
- Select cleaning chemicals and detergents which are gentle on your wastewater treatment system and disposal area.
- Minimise the use of antibacterial chemicals and bleaches, which can kill off the bacteria treating your wastewater. Please be aware that antibiotics may reduce the effectiveness of your wastewater treatment system.
- Complete regular maintenance checks on your wastewater treatment system. Whether it’s an AWTS or a septic it will still require maintenance. Septic tanks may require desludging every 3 – 5 years to prevent solids clogging the absorption area. AWTS require servicing by a qualified technician every 3 months to ensure everything is working correctly and to ensure adequate disinfection.
- Keep a site plan indicating the location of your wastewater treatment system and disposal area.
- Keep records of installation, pumping, inspections and other maintenance.
- Install an outlet filter to your wastewater treatment system. These are available for septic tanks to protect your absorption area from suspended solids.
Don’t
- Put fats and oils down the sink as they cause blockages when they solidify.
- Put foreign materials such as sanitary napkins or other hygiene products, condoms or nappies into the system. These will not break down and will cause on-going problems with blockages.
- Switch off power to AWTS. These require a constant power supply to operate effectively.
- Drive over the disposal area or erect any structures or paths.
- Plant large trees to shade the disposal area as sunlight aids in the evaporation and transpiration of effluent.
- Use large amounts of bleach, antibacterial products or chemical cleaning products.
- Go all-out and wash everything all at one time! Your wastewater treatment system is designed and has grown to treat a constant flow of wastewater throughout the week. When excess wastewater is put through the system it may not be treated adequately.
- Ignore the maintenance requirements of your wastewater treatment system!
Will council be inspecting my septic tank/on-site sewage management system?
The OSMS outlines a range of risk categories. For any given system the highest risk category for the range of issues will determine the risk category of the system.
The risk categories are high, medium and low risk. High risk systems are likely to be inspected by Council every year while medium risk systems will be inspected every 3 years and low risk, 5 years.
Council may also undertake an inspection if information is requested by a potential purchaser or a complaint is made.
Council inspection will incur the inspection fee of $90 as set out in the current Schedule of Fees and Charges. 
If I have a septic tank will this need to be
replaced by a newer environmentally friendly system?
Many people are concerned that when Council inspects their property that they will have to spend thousands of dollars upgrading their system to a newer environmentally friendly system. This however will not be the case. When Council inspects your system, whatever type of system that it is, if it is found to be in good working order then no upgrade will be necessary. If your septic system or other system is found to have problems you will only need to repair it so that it is working efficiently.
What do I need to do when applying for approval from council?
There are essentially two types of approvals required for on-site wastewater facilitates. These are approval to install or modify and an approval to operate.
Approval to install or modify
You will need to complete and return an application to install, modify and or operate wastewater treatment system form OSMS1 and OSMS2. The application fee of $260 will include a preliminary inspection and the approval to operate for the first five years.
When lodging your application with Council you need to ensure that the following information is included:
- An On-site Wastewater Management Plan
- Details about the dwelling that the systems will serve
- The site and soil where it will be installed
- The type of system you plan to install
- The relevant NSW Health accreditation. NSW Heath Waste Water website has all the current accredited systems. The certificate for the proposed system should be supplied and read in full
- Details of the installer (only persons with the appropriate license from Department of Fair Trading are permitted to install systems)
- The method of waste water disposal
- A site map
Upon installation a further inspection will be required to allow for the issuing of the Permit to Operate; a fee of $90 will be incurred.
Application for an Approval to Operate requires the Application to install, modify and or operate wastewater treatment system form OSMS1. Council may request further information to ensure our records are complete and up to date. Information may include house plans and Works and Executed Drawings (to show where the pipes, tanks and disposal area are).
Council strongly advises that applicants seek the assistance of a suitable qualified person with experience with the Environmental and Health Protection Guidelines - On-site sewage management for single households from the Department of Local Government and the standard AS/NZS 1547:2000 On-site domestic wastewater management.
This page last updated 18 November, 2009 11:02 AM
