Bore Water Testing in Perth — Drinking Water Safety
Perth is unusual among Australian capital cities. While most major urban centres rely on dams and desalination, Perth sits above one of the most productive shallow aquifer systems in Australia — and a significant number of households outside the reticulated scheme use bore water for drinking, cooking, and household use.
This article is specifically about bore water used for drinking and household purposes. If you're on scheme water for drinking and using your bore purely for garden irrigation, this isn't the right article — see our Perth bore water irrigation testing guide instead.
Who this applies to
Most Perth metropolitan residents on the Water Corporation's reticulated network use scheme water for drinking and bore water for garden irrigation only. If that's you, drinking water safety testing isn't what you need.
This article is for:
Properties in outer metropolitan Perth, semi-rural areas, and rural WA that rely on bore water as a primary or supplementary drinking supply
Households in areas including Bullsbrook, Gingin, Chittering, Serpentine-Jarrahdale, and the outer Swan Valley where scheme water is not available or bore water supplements it
Anyone who drinks bore water — even occasionally — and has never had it tested
Buyers or renters moving onto a property with a bore supply and no testing history
If you use your bore for drinking at all — even for a glass here and there, for making coffee, or for filling a filtered jug — this article applies to you.
Perth's groundwater — the basics
The Superficial Aquifer underlies most of the Swan Coastal Plain from Mandurah to Two Rocks. It's accessible at depths as shallow as 3–10 metres across large parts of the metropolitan area, making bore installation straightforward and relatively inexpensive.
This aquifer is unconfined — there's no impermeable layer above it separating it from the surface. Rainfall percolates directly through Perth's sandy soils and recharges the aquifer, which is why Perth's groundwater is generally fresh and accessible at shallow depth.
That same connectivity to the surface is the key vulnerability. The same pathways that allow rainfall recharge also allow surface contaminants — fertilisers, pesticides, petroleum hydrocarbons, septic system effluent, and industrial chemicals — to migrate downward into the water table.
What's in Perth bore water used for drinking
Microbiology — the first concern
Bore water has no disinfection treatment and no regulatory monitoring. E. coli and Thermotolerant Coliforms are the primary indicators of faecal contamination — and in urban and peri-urban Perth, the most common sources are compromised bore casings, proximity to septic systems, and surface water infiltration.
The ADWG guideline for E. coli is zero detectable organisms per 100 mL. There is no safe threshold. A bore that tested clean on microbiology last year may not be clean today — casing condition, rainfall events, and nearby land use all affect microbial risk over time.
Iron and manganese
Iron and manganese are the most commonly elevated parameters in Perth's Superficial Aquifer. Most bore water users are aware of iron through visible orange-brown staining on pavers and garden infrastructure — but drinking water exposure to elevated iron and manganese is a separate concern.
The ADWG health guideline for manganese is 0.5 mg/L. At concentrations above this level, long-term exposure is associated with neurological effects. The aesthetic guideline is 0.1 mg/L — water above this level may taste metallic and stain laundry and fixtures. Iron has an aesthetic guideline of 0.3 mg/L. Neither has a taste or colour sign at low concentrations of concern.
Nitrate
Nitrate in Perth's Superficial Aquifer is widespread and well-documented. The primary sources are residential and horticultural fertiliser application and septic system effluent across older suburbs without reticulated sewerage.
The ADWG health guideline for nitrate is 50 mg/L as NO3. Elevated nitrate is of particular concern for households with infants under three months — at high concentrations it can cause methaemoglobinaemia by interfering with the blood's ability to carry oxygen. Studies of Perth's Superficial Aquifer have found nitrate concentrations exceeding the ADWG guideline in parts of the northern and southern suburbs.
PFAS — the growing concern in Perth
Perth has a significant number of PFAS contamination sites associated with defence facilities, airports, and fire training grounds where aqueous film-forming foam was historically used.
Known PFAS investigation areas in the Perth metropolitan region include:
RAAF Base Pearce (Bullsbrook) — one of the largest PFAS investigation areas in Western Australia, with groundwater contamination extending into surrounding rural and residential areas
RAAF Base Gin Gin (Two Rocks area)
Perth Airport — PFAS investigation ongoing in surrounding groundwater
Jandakot Airport — PFAS detected in surrounding groundwater
Multiple metropolitan fire stations across the city
The 2025 ADWG substantially tightened PFAS guideline values — PFOS is now limited at 0.00007 mg/L, a reduction of more than 90% from previous guidance. Standard laboratory reporting limits (0.01–0.05 µg/L) are no longer sufficient to assess compliance. Trace-level detection at 0.001–0.005 µg/L is required for a meaningful result.
If your property is within several kilometres of any of these sites, PFAS testing at trace detection level is warranted.
Arsenic and geological metals
Arsenic occurs naturally in some Perth aquifer formations, particularly in areas with lateritic soils. The ADWG health guideline for arsenic is 0.01 mg/L — a concentration with no visible sign in water. Other metals including barium, boron, and selenium can also be naturally elevated depending on the geological unit your bore draws from.
Fluoride
Some Perth aquifer units — particularly deeper confined aquifers — can be naturally elevated in fluoride. Unlike scheme water, which is fluoridated to a controlled level of approximately 0.6–0.7 mg/L, bore water fluoride is entirely determined by local geology and can vary significantly between aquifers and even between adjacent bores. The ADWG health guideline for fluoride is 1.5 mg/L.
Water chemistry
pH, hardness, alkalinity, conductivity, and the full cation/anion balance are relevant for understanding how bore water behaves in plumbing, how corrosive it is to fittings and hot water systems, and its overall suitability for household use. Highly saline or mineralised water that is borderline acceptable for irrigation may be unsuitable for drinking on taste grounds alone.
What's regulated — and what isn't
The Water Corporation monitors the Superficial Aquifer at a network level for resource management. This monitoring is not designed to assess the safety of individual private bores for drinking water.
The Department of Water and Environmental Regulation (DWER) licenses bore construction and sets casing requirements, but does not routinely test the water quality of private bores used for domestic purposes.
Individual bore owners in Western Australia are responsible for confirming the safety of the water their bore produces. There is no authority checking your supply between tests.
Which test panel is right for Perth drinking bore water
Bore Essentials — A$499 The right starting point for any Perth bore used for drinking. Covers microbiology, 22 metals and trace elements (including arsenic, iron, manganese, and uranium), full water chemistry, nitrate/nitrite/ammonia, turbidity, apparent colour, and fluoride. Approximately 42 parameters benchmarked against the ADWG.
Bore Advanced — A$699 Everything in Essentials, plus 30 PFAS compounds at trace detection level (0.001–0.005 µg/L). Recommended for any property within a plausible PFAS migration zone — Bullsbrook, Two Rocks, properties near Perth Airport, Jandakot, or any metropolitan fire station with historical foam use.
Bore Complete — A$1,099 Everything in Advanced, plus 53 volatile organic compounds (SIM scan), 36 organochlorine and organophosphate pesticides at trace level, and 10 triazine herbicides. Relevant for rural and peri-urban properties adjacent to agricultural land use, historical market gardens, or industrial activity.
How often should Perth bore water be tested
For a bore used as a primary drinking supply, annual testing is appropriate as a baseline. Also test:
When first commissioning a bore or moving to a property with an existing bore
After any maintenance work on the bore, pump, or pressure system
After heavy rainfall following an extended dry period
If taste, colour, or odour changes
If you receive a PFAS advisory or notice for your area
If nearby land use changes
Perth's Superficial Aquifer is a dynamic system. Nitrate concentrations in particular can change seasonally with irrigation patterns and rainfall recharge.
Using your bore for irrigation rather than drinking?
If you're on the Water Corporation's reticulated scheme for drinking water and using your bore exclusively for garden irrigation, lawn care, or agricultural use, a drinking water safety panel isn't what you need.
Our Bore Irrigation Screen tests 21 parameters relevant to irrigation performance — salinity, sodium, SAR, iron, manganese, hardness, bicarbonate, and nutrients — benchmarked against ANZECC/ARMCANZ 2000 irrigation water quality guidelines. It's designed for the large majority of Perth metropolitan bore users whose primary concern is lawn health, dripper scale, and staining rather than drinking water safety.
Frequently asked questions
My bore water looks and tastes fine. Do I still need to test?
Yes. The contaminants most relevant to bore water drinking safety — E. coli, arsenic, nitrate, PFAS, and manganese — are consistently undetectable by taste, colour, or smell at concentrations that may still exceed ADWG guideline values. Clear, fresh-tasting bore water can simultaneously contain elevated arsenic or a positive E. coli result.
The Water Corporation tests the aquifer — doesn't that mean my bore is monitored?
No. Water Corporation monitoring covers the aquifer resource at a network scale for planning and management purposes. It does not assess the water quality at individual private bores, and the results are not reported to bore owners. Your bore is your responsibility.
How is Perth bore water different from town water?
Perth scheme water is treated, chlorinated or chloraminated, fluoridated to a controlled level, continuously monitored, and required to meet ADWG guideline values at the point of supply. Perth bore water has none of these protections. What comes out of your bore tap is untreated groundwater — its chemistry is determined entirely by the geology it's drawn from and the land use above it.
Do I need a plumber or consultant to collect the sample?
No. The sampling kit contains everything you need — sterile collection bottles, step-by-step instructions, and a pre-paid express return label. You collect the sample yourself at your bore outlet or tap, seal the bottles, and post the kit back. No site visit required.
What happens if my results exceed an ADWG guideline?
Your report will identify which parameter exceeded the guideline value, the most likely source, and the health implications at that concentration. Common responses include UV disinfection or chlorination for bacterial contamination, reverse osmosis for elevated metals and nitrate, and specific media filters for arsenic. We recommend using your results to guide a conversation with a licensed plumber or water treatment specialist.
Safe Water Lab provides mail-order bore water testing for Perth and Western Australia using NATA-accredited laboratory analysis (Accreditation No. 1261). All results are benchmarked against the Australian Drinking Water Guidelines with plain-language explanations of any exceedances. View our bore water drinking kits →