Is Perth tap water safe to drink, and what's in it?

Yes. Water Corporation scheme tap water in Perth is treated, disinfected and tested against the Australian Drinking Water Guidelines. In 2024–25, all 28 Perth supply localities met the health-related E. coli and Naegleria requirements in the official tables. Chemical health results, including fluoride where it is added, also sat within the limits used in that report.

What changes from suburb to suburb is how the water feels and tastes: hardness, salts, and a slight chlorine smell. Those are mostly aesthetic issues, not a sign that the water is unsafe to drink. Look up your suburb on the map or the Western Australia directory, then use this guide for the Perth-wide picture. The About page explains how WaterWatch reads the official tables.

This guide uses the Water Corporation Drinking Water Quality Annual Report for 1 July 2024 to 30 June 2025. As of 12 November 2026, WaterWatch suburb pages still display the 2023–24 report. The figures here are the newer official set.

How to read these figures

A locality is a water quality zone, not always the same thing as a suburb. Many Perth suburbs are not sampled on their own. WaterWatch has a nearest-supply page for those places. It is a useful proxy, not a guarantee of the exact blend reaching one street, because much of Perth is fed by the blended Integrated Water Supply Scheme.

A typical reading is the mean of the year's samples. Aesthetic figures such as hardness, sodium and total dissolved solids are often based on only two to five samples for the whole year, taken in the supply network, not at your kitchen tap. The peak is the highest sample.

Health and aesthetic limits are different. Health guidelines are about safety over a lifetime of drinking the water. Aesthetic guidelines are about taste, appearance and wear on plumbing. Going over an aesthetic limit is not a health failure.

Is Perth tap water safe to drink?

The Department of Health regulates drinking water quality in Western Australia against the Australian Drinking Water Guidelines, published by the National Health and Medical Research Council. Water Corporation's work sits under a memorandum of understanding with the Department of Health. In 2024–25, Water Corporation took almost 70,000 samples from sources, treatment plants and pipe networks, with more than 365,800 analyses by contracted independent laboratories. HealthyWA notes that almost all Western Australians receive water from licensed scheme suppliers, and that the state has one of the lowest rates of water-borne disease in the world.

What was tested in Perth in 2024–25

The published Perth tables cover microbial indicators, fluoride, metals, hydrocarbons, nitrate, pesticides, PFAS, radiological measures, trihalomethanes and a long list of aesthetic characteristics. In those tables:

• Every Perth locality recorded zero E. coli detections, and zero detections of thermophilic Naegleria.
• Fluoridated supplies were sampled about weekly. Typical fluoride readings in those localities sat between 0.78 and 0.86 mg/L, inside the Perth target range of 0.7 to 1.0 mg/L set by the Department of Health, and well under the Australian health guideline of 1.5 mg/L.
• Nitrate typical readings were well under the infant health guideline of 50 mg/L as nitrate. The highest Perth typical readings were 7.0 mg/L at Neerabup and Yanchep.
• Trihalomethanes, which can form when chlorine reacts with natural organic matter, are assessed as a yearly mean against a health guideline of 0.25 mg/L. Every Perth locality met that test. The highest typical reading was 0.139 mg/L at West Yokine.
• PFAS samples were reported for all 28 Perth localities, and each was marked as meeting the guideline. Water Corporation's public PFAS monitoring page states that all scheme drinking water it supplies is fully compliant with the Australian Drinking Water Guidelines limits for PFAS, and that current sampling shows no detections above those limits in scheme water supplied to customers.
• Pesticides and the metals suites were marked as meeting the guideline where samples were required.

A "guideline met" tick in the official tables is usually based on the yearly mean for chemicals. It describes the scheme, not a tank, a bore, or a tap downstream of household pipes.

Chlorine, taste and smell

Chlorine is added to all Water Corporation schemes, including Perth, so a disinfectant residual remains in the pipes. The Department of Health says normal chlorine concentrations in scheme drinking water in Western Australia usually range from 0.5 to 1.5 mg/L, and may vary with flow, distance from the treatment plant, and maintenance. Most people can smell chlorine from about 0.6 mg/L. Some people notice it from 0.2 mg/L. The Australian health guideline for total chlorine is 5 mg/L. The aesthetic value of 0.6 mg/L is an odour threshold. The national guidelines note that a residual above that threshold may be needed to keep disinfection effective.

A chlorine smell is not, by itself, a sign that the water is unsafe. The Department of Health says chlorinated drinking water is safe to drink, and that householders do not need to add more chlorine to licensed scheme water. If the smell bothers you, the same advice suggests placing a jug of water in the fridge, uncovered. HealthyWA says an activated carbon filter can also reduce chlorine taste and odour. That is about comfort, not a safety requirement.

Water Corporation combines chlorine with ammonia to make monochloramine on most of the Goldfields and Agricultural scheme, where long pipelines need a longer-lasting residual. That is not how the Perth metropolitan tables describe the local supply. This guide does not treat Perth tap water as chloraminated.

Naegleria, showers and nasal rinses

Thermophilic Naegleria, including the species Naegleria fowleri, can cause amoebic meningitis if contaminated warm fresh water is forced up the nose. It is not a drinking risk in the same way. The Water Corporation report notes that the organism is safe to drink, and that adequate chlorine can control it in water. There were no thermophilic Naegleria detections in the 2024–25 Perth locality tables.

HealthyWA says chlorinated scheme drinking water supplied to urban properties is safe to drink and use, including for ordinary showering and bathing. It also says not to use untreated tap water for nasal irrigation, and not to sniff water up the nose when bathing or washing your face. For a nasal rinse, use boiled and cooled tap water, distilled or sterile water, or water passed through a filter with an absolute pore size of 1 micron or smaller. Run shower and bath taps for a few minutes to flush the pipes, and run hoses and sprinklers until cool water flows before children play with them. Those steps matter in warm weather. They do not mean the water is unsafe to drink.

Bores, tanks, old pipes and boil water alerts

The official Perth results describe Water Corporation scheme water. They do not describe a rainwater tank, a household bore, or the plumbing inside a house.

HealthyWA says bore water should not be used for drinking, bathing, watering edible plants, filling pools, or food preparation unless it has been tested and treated for that use. If bore water is your drinking supply, it should be tested at least once a year by a NATA-accredited laboratory. Rainwater tanks have their own risks, including roof debris, lead flashing and animal droppings. HealthyWA says routine testing of a domestic tank is not normal practice and is often unnecessary, but if you drink tank water and want it tested, use the Department of Health Standard Drinking Water Test. The home water testing guide explains when a lab test is worth it, and how to read the results.

Household pipes and fittings can add metals, including lead, after the water has left the scheme. The 2024–25 Water Corporation report lists a lead health guideline of 0.01 mg/L, and scheme metals suites are sampled in the network, not at every kitchen tap. If you are concerned about old pipes or fittings, a laboratory test of water from the tap is the way to measure it.

If a boil water alert is issued for your area, follow it. HealthyWA says boiling will not remove chemical contamination. Those alerts are uncommon for Perth scheme water, and none is implied by the 2024–25 annual tables summarised here. After a disaster, HealthyWA also advises checking with your local council before using mains water, and running taps for a few minutes if pipes or storage may have been damaged.

Vulnerable groups, visitors and infant formula

Visitors can drink Perth scheme tap water, based on the same official results, unless a boil water alert or a local supplier notice says otherwise. This guide does not rank other Australian cities, or claim to have tested supplies outside Water Corporation's published tables.

For bottle-fed infants, the nitrate health guideline is 50 mg/L as nitrate. Perth typical readings in 2024–25 were far below that. HealthyWA advises against using distilled or demineralised water when reconstituting infant formula, and says anyone planning to drink mainly distilled water should discuss that with their doctor. Fluoride in Perth scheme water, where it is added, is a directed public health measure with a legal maximum of 1.0 mg/L after dosing.

If you have a medical condition that makes you cautious about drinking water, ask your doctor. The scheme standard is the Australian Drinking Water Guidelines for the general population. This guide does not invent a separate restriction for Perth mains water.

Do you need to filter Perth scheme water?

HealthyWA says it is not necessary to filter scheme drinking water in Western Australia for safety, unless you live in an area where you may want to soften hard water. Routine sampling is reported to the Department of Health. A filter can improve taste or reduce chlorine odour. Simple carbon filters should not be relied on to disinfect water, and household filters or ultraviolet units will not, in most cases, make water safe in relation to amoeba unless chlorine is also used. WaterWatch does not sell filters. If taste or scale is the issue, start with your locality reading and the hardness guides linked below.

What's in Perth tap water?

Perth scheme water is a blend, and the blend is not the same everywhere. In 2024–25, Water Corporation reported that the Integrated Water Supply Scheme was made up of 43.6 per cent groundwater, including water recharged through groundwater replenishment, 41.5 per cent desalinated seawater, and 13.8 per cent surface water from dams. Just over 308 billion litres were delivered to more than 997,000 property connections in Perth. Two Rocks is a separate, independent groundwater scheme, not part of that blended scheme.

The northern part of the integrated scheme is largely supplied from groundwater. The central system draws on the Perth Seawater Desalination Plant at Kwinana, groundwater treated at Jandakot, and metropolitan dams, and also receives water from the north. The southern system draws on the Southern Seawater Desalination Plant, north of Binningup, and the southern dams. In 2024–25 the Perth plant produced almost 45.5 billion litres, and the southern plant more than 95.7 billion litres. Surface water supplied 46.83 billion litres into the scheme. Groundwater replenishment, in which treated wastewater is further treated and recharged into confined aquifers before later abstraction and treatment, recharged 21.1 billion litres in 2024–25. That volume sits inside the groundwater percentage, not as a fourth official share.

The mix changes through the year with rainfall, demand and operations. That is a major reason taste, hardness and saltiness differ between suburbs, and why a nearest-supply page is a guide rather than a street-level source certificate.

Fluoride

Fluoride is added to most Perth metropolitan supplies, as directed by the Minister for Health under the Fluoridation of Public Water Supplies Act 1966. HealthyWA, last reviewed on 10 November 2025, says the optimum for the Perth metropolitan area is 0.9 mg/L, with a range of 0.7 to 1.0 mg/L, and a legal maximum of 1.0 mg/L. The Australian health guideline is 1.5 mg/L. Fluoridated Perth localities in the 2024–25 tables had typical readings between 0.78 and 0.86 mg/L.

Not every Perth locality is fluoridated in those tables. Dwellingup had a typical reading below 0.1 mg/L. Two Rocks had 0.15 mg/L. North Dandalup had 0.45 mg/L. Those three do not carry the official note used for fluoridated supplies. Check your WaterWatch locality page rather than assuming every Perth suburb is dosed.

Chlorine

Chlorine is the disinfectant used in all Water Corporation schemes. It is not a leftover contaminant. It is added so the water stays protected in the pipes. See the taste and smell section above for the Department of Health's usual residual range, the odour threshold, and the health guideline of 5 mg/L. Typical residual figures are not published in the Perth locality tables, so this guide does not invent a suburb-by-suburb chlorine number.

Sodium, chloride and total dissolved solids

These are the salts that most affect taste. The Australian aesthetic guidelines are 180 mg/L for sodium, 250 mg/L for chloride, and 600 mg/L for total dissolved solids, with the TDS limit based on taste. Water Corporation reports TDS as total filterable solids by summation.

In 2024–25, the unweighted mean of the 28 Perth locality typical readings was 81 mg/L for sodium, 137 mg/L for chloride, and 382 mg/L for TDS. Every Perth typical sodium and TDS reading sat under its aesthetic guideline. The saltiest typical sodium was 127 mg/L at Mount Hawthorn. The highest typical TDS was 576 mg/L at Yanchep, still inside the guidelines' "good quality" palatability band of 0 to 600 mg/L. The lowest typical TDS readings were 129 mg/L at Tamworth Hill, 130 mg/L at Pinjarra and 140 mg/L at North Dandalup. Water with low TDS can taste flat. Water with higher TDS can taste saltier.

Hardness

Hardness is dissolved calcium and magnesium, reported as mg/L of calcium carbonate. It has no health guideline. The aesthetic guideline is 200 mg/L. Official 2024–25 typical readings in Perth ranged from 29 mg/L in Dwellingup to 228 mg/L in Two Rocks. Most localities sat in the Australian "good quality for all domestic uses" band of 60 to 200 mg/L. Only Two Rocks had a typical reading above 200 mg/L. Yanchep's typical reading was 198 mg/L, with a peak of 210 mg/L.

Hard water can leave spots on glass, make soap harder to lather, and form scale in kettles and hot water systems. For the full Perth ranking, see Does Perth have hard water? For the mg/L scale, and for why some online charts call readings above 180 mg/L "very hard" when the Australian table does not, see water hardness explained. If scale in a storage tank or continuous-flow unit is the practical issue, continue to hard water and your hot water system.