What Is a Private Water Supply?
A private water supply is any drinking water supply that is not provided by a regulated water utility — that is, any supply that doesn't come from a town water main. If your household, business, or accommodation property gets its drinking water from a rainwater tank, bore, dam, creek, spring, or any other independent source, you are operating a private water supply.
The term is used consistently across Australian state legislation and by health authorities including NSW Health, SA Health, and Queensland Health. Understanding whether your supply qualifies — and what obligations that creates — matters particularly if you are running a commercial operation on that supply.
What counts as a private water supply
The most common private water supplies in Australia are:
Rainwater tanks — Roof catchment systems collecting rainfall for household use. Extremely common in rural and regional Australia and increasingly used in peri-urban areas. No disinfection treatment, no regulatory monitoring.
Bore water — Groundwater accessed via a drilled bore or spear point. Used extensively across Western Australia, South Australia, Queensland, and rural NSW for household, irrigation, and stock water purposes.
Dams and surface water — On-property catchments collecting runoff from paddocks or natural watercourses. Common on rural and agricultural properties.
Springs — Natural groundwater discharge points. Less common but used on some rural and mountain properties.
Creeks and rivers — Direct surface water extraction for household or agricultural use. Uncommon for drinking purposes but still occurring on some rural properties.
All of these share a common characteristic: the operator is responsible for the safety of the water. There is no authority treating it, monitoring it, or checking it between tests. What comes out of the tap is what the source delivers.
Who the term applies to
For private households on a private water supply, the obligations are primarily a matter of personal health management. No state in Australia currently requires individual households to test and register their rainwater tank or private bore — though NSW Health, SA Health, and Queensland Health all recommend regular testing and provide guidelines to help households manage their supply safely.
The obligations shift when a private water supply is used in a commercial context. In NSW, businesses and accommodation providers not connected to town water are classified as private water suppliers under the Public Health Act 2010 and are required to develop a Quality Assurance Program. In other states, similar obligations exist under food safety legislation, local government requirements, or general public health duty of care provisions.
The clearest commercial contexts where private water supply obligations apply are:
Short-term rental and holiday accommodation (Airbnb, farm stays, eco lodges, B&Bs)
Food businesses including cafes, restaurants, and catering operations
Schools, childcare centres, and community facilities
Healthcare facilities including medical, dental, and aged care
Schools and childcare centres on private water supplies
Schools and childcare centres on private water supplies carry a higher duty of care than most other operators — and face more significant consequences if something goes wrong. Children are significantly more vulnerable than healthy adults to waterborne illness, lead exposure, nitrate toxicity, and bacterial contamination. The consequences of a water quality incident at a school are serious: illness outbreaks, regulatory investigation, reputational damage, and potential liability.
What the regulations say
In NSW, independent schools and non-government educational facilities not connected to town water are classified as private water suppliers under the Public Health Act 2010 and Public Health Regulation 2022. They are required to develop and maintain a Quality Assurance Program (QAP) — a documented risk management plan covering the water source, potential contamination risks, monitoring, and corrective actions. The NSW Private Water Supply Guidelines provide the framework for what a QAP must contain.
Queensland Health has published specific guidelines for managing private drinking water supplies in commercial and community premises that apply to schools. While Queensland has no blanket legislative mandate equivalent to NSW, local councils can impose requirements and food safety legislation applies to any food preparation using the water supply.
In all states, workplace health and safety legislation creates a general duty to provide a safe workplace — which extends to the water supply used by staff and students.
The specific risks for schools
Schools on private water supplies face several risk factors that are particularly relevant to their student population:
Lead — Schools built before 1990 may have lead-containing plumbing components, roof flashing, or solder in internal water systems. Tank water, which is naturally soft and slightly acidic, is more aggressive toward lead-containing materials than harder treated water. Children are disproportionately affected by lead exposure — developmental effects occur at concentrations too low to cause visible symptoms and there is no safe threshold.
E. coli and bacterial contamination — Tank and bore water have no disinfection treatment. Schools with tanks receiving roof runoff from bird activity, overhanging trees, or gutters in poor condition are at ongoing microbial risk. Children's immune systems are less developed than adults, and gastrointestinal illness from waterborne bacteria affects children more severely.
Nitrate — On rural and agricultural properties, bore and tank water can carry elevated nitrate from fertiliser leaching and septic systems. Nitrate is of particular concern for the youngest children — infants under three months are at serious risk from elevated nitrate concentrations, and primary schools with occasional very young visitors or siblings on site should be aware of this.
PFAS — Schools near defence bases, airports, or fire training facilities may have PFAS-affected bore or tank water. PFAS have no taste or odour and are not removed by standard filtration. The 2025 ADWG substantially tightened PFAS guideline values — schools in plausible PFAS zones should test at trace detection level.
What a compliant testing program looks like
For a school on a private water supply, the appropriate annual test panel includes at minimum:
E. coli and Thermotolerant Coliforms — with cold-chain sample transport
Lead, copper, and a full metals panel — including arsenic and any metals relevant to roof and plumbing materials
Nitrate, nitrite, and ammonia
pH, conductivity, hardness, and full water chemistry
Fluoride
Where the school is near a PFAS contamination source, a 30-compound PFAS panel at trace detection level should be added.
Testing should be conducted by a NATA-accredited laboratory under ISO/IEC 17025, with results compared against the Australian Drinking Water Guidelines. Results should be kept on file as part of the school's Quality Assurance Program and made available to the relevant local health district or council environmental health officer on request.
Frequency
Annual testing is the appropriate baseline. Schools should also test after any roof, gutter, tank, or bore maintenance; after extended dry periods followed by heavy rainfall; after changes in taste, odour, or colour; and if any student or staff illness is suspected to have a waterborne cause.
Why it matters
The distinction between a regulated utility supply and a private water supply is significant for one reason: no one else is checking. Town water supplied by a utility is treated, continuously monitored, and required to meet the Australian Drinking Water Guidelines (ADWG) before it reaches your tap. A private water supply has none of these protections.
The most serious contaminants in private water supplies — E. coli, arsenic, lead, nitrate, PFAS, and agricultural chemicals — are consistently invisible, odourless, and tasteless at concentrations that can still affect health. Testing is the only way to know what is actually in the water.
Testing a private water supply
Testing should be conducted by a NATA-accredited laboratory under ISO/IEC 17025, with results compared against the Australian Drinking Water Guidelines. For microbiology testing, cold-chain sample transport — keeping the sample chilled from collection through to laboratory receipt — is essential for accurate results.
Annual testing is the appropriate baseline for most private water supplies used for drinking. Commercial operators including accommodation providers and schools should test at minimum annually and keep results on file as documentation of due diligence.
For accommodation providers specifically, see our detailed guide to private water supply testing obligations for Airbnb and holiday accommodation.
For households on tank water, see our complete guide to rainwater tank water quality in Australia and our guide to how often tank water should be tested.
Safe Water Lab provides mail-order private water supply testing across Australia using NATA-accredited laboratory analysis (Accreditation No. 1261). All results are benchmarked against the Australian Drinking Water Guidelines. View testing kits →