Information Source
What’s Really In NSW Tap Water?
A clear, easy-to-read summary based on the official WaterNSW Annual Water Quality Monitoring Report 2024–2025.
200+ monitored characteristics
PFAS investigations
82 water quality incidents
Pesticides
Heavy metals
1
The Big Misconception
“Within guidelines” does not mean contaminant-free
Understanding the report
Important context: NSW water can meet Australian Drinking Water Guidelines while still requiring continuous monitoring for chemicals, metals, pesticides, PFAS, biological risks and environmental pollutants.
i
What this means for households
Plain English
Municipal water treatment is designed to make water legally compliant and safe at scale. That does not necessarily mean the water is free from every chemical, environmental pollutant, treatment by-product, pesticide residue, or contaminant people may prefer to avoid.
This does not mean NSW water is considered unsafe or non-compliant. It means water quality is constantly monitored because water sources are exposed to real-world pressures such as rainfall, runoff, algae, land use, infrastructure and environmental contamination.
Why this monitoring existsIf the water was perfectly pure at source, there would be no need for continuous monitoring of pesticides, metals, PFAS, algae toxins, bacteria, industrial compounds, and radiological contaminants.
200+
Water Quality CharacteristicsMonitored across the NSW water network.
82
Water Quality IncidentsRecorded during the reporting period.
5M+
People SuppliedAcross Greater Sydney and surrounding regions.
2
Visual Snapshot
A simple visual breakdown of what is monitored
Infographics
Water Quality Monitoring Categories
Grouped into simple household-friendly categories.
Chemical / physical indicators
Pesticides / metals
Biological risks
Radiological screening
Common Water Quality Concerns
These are the categories households usually find most surprising.
3
What WaterNSW Monitors For
The substances and indicators customers should be aware of
Monitoring overview
Important context: The official monitoring program includes physical, chemical, biological, radiological, hydrological and environmental parameters because water quality is affected by catchments, storages, treatment processes, weather and land use.
Pesticides & Herbicides
Linked to agricultural runoff, weed control, roadside spraying and land management.
GlyphosateAtrazineChlorpyrifosSimazineDiuron2,4-DMCPAPicloram
Why it matters: Homeowners often do not realise these chemicals are part of water monitoring at all. Even when results are compliant, many families prefer to reduce unnecessary long-term exposure where possible.
Heavy Metals
Can enter water through geology, infrastructure, catchment runoff and environmental contamination.
ArsenicMercuryUraniumManganeseAluminiumSeleniumBarium
Why it matters: The report identifies deteriorating trends in some storages relating to metals, turbidity and nitrogen. This makes the issue current, not theoretical.
PFAS & Synthetic Compounds
Industrial and synthetic compounds monitored due to environmental contamination risks.
PFASBenzeneVinyl chlorideSynthetic organics
Why it matters: PFAS investigations were undertaken after elevated PFAS levels were detected in parts of the Blue Mountains catchment.
Biological Risks
Pathogens and algae-related risks can increase after environmental events.
E. coliCryptosporidiumGiardiaCyanobacteriaMicrocystins
Why it matters: Heavy rainfall and algal conditions can increase treatment pressure and water quality incident management.
Water Condition Indicators
Indicators that show when water is under pressure from sediment, organic matter and catchment events.
TurbidityTrue colourpHSuspended solidsOrganic carbon
Why it matters: These indicators can affect taste, odour, appearance, treatment difficulty and the amount of treatment required before water reaches homes.
Radiological Screening
Radiological parameters are screened as part of precautionary water quality monitoring.
Gross alphaGross betaUranium
Why it matters: Even when results are below guideline values, the fact these are screened shows how broad the monitoring program needs to be.
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How This Applies To Your Home
Daily household water exposure
Interactive scale
How often does your household use municipal water?
Select the items that apply to your household to better understand how often water is used throughout the home.
Low useRegular useHigher daily exposure
Household water useSelect the items that apply to your home to see how daily exposure builds.
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Why this matters beyond drinking water
Whole-home use
Most people think about water quality only at the kitchen tap. In reality, the same water is used for showering, bathing, cooking, cleaning, laundry, pets, appliances and brushing teeth.
Hot water also creates steam, which can increase smell and inhalation exposure from chlorine and other treatment-related odours.
5
Water Quality Events Are Real
Why monitoring and incident response protocols exist
Report highlights
7
Major IncidentsManaged under water quality response protocols.
7
Significant IncidentsRecorded during the reporting period.
68
Minor IncidentsLogged across the declared catchment.
Why this mattersThese incidents included challenges from wet weather events, algae, turbidity, pH, colour and raw water quality exceedances. This shows the water supply is constantly influenced by environmental conditions.
Heavy Rainfall
Wet weather inflows can push sediment, nutrients, colour, organic matter and other contaminants into catchments and storages.
Agricultural Runoff
Land use can contribute pesticides, herbicides, nutrients and runoff-related contaminants.
Urbanisation
Urban areas can contribute stormwater, road residue, industrial runoff, sewerage influences and higher nutrient loads.
Algal Conditions
Algae and cyanobacteria are monitored because bloom events can create toxins, taste issues, odour issues and filtration challenges.
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Why Some Families Choose Whole Home Filtration
An added layer beyond minimum compliance
Information only
Better Shower Water
Can help reduce chlorine exposure, chemical odour, dryness and irritation from daily showering.
Cleaner Drinking Water
Can help reduce sediment, taste, smell and unwanted compounds before they reach your glass.
Every Tap Protected
Kitchen, bathrooms, laundry, appliances and showers can all receive filtered water from the same system.
Peace Of Mind
Many households choose filtration as an added layer beyond standard municipal treatment and minimum compliance.
Final thought
The official WaterNSW report shows that modern water systems require constant testing, monitoring, incident management and contamination control. For many homeowners, whole home filtration is about reducing unnecessary exposure and improving the water quality of the entire home.
Source: WaterNSW Annual Water Quality Monitoring Report 2024–2025
This brochure summarises publicly available information from the WaterNSW Annual Water Quality Monitoring Report 2024–2025.
This brochure summarises publicly available information from the WaterNSW Annual Water Quality Monitoring Report 2024–2025.
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