Nitrates are nitrogen-oxygen chemical compounds that naturally occur in soil, water, and air. In Perth's water supply, nitrates primarily come from agricultural runoff, septic systems, and natural geological deposits. While tightly regulated by water authorities, understanding nitrate levels is important for residents with specific health concerns or private water sources.
This page is part of our comprehensive guide to water contaminants in Perth. For an overview of Perth's water sources and treatment process, see our guide to Perth's drinking water supply.
Understanding Nitrates in Perth's Water
Nitrates (NO₃) are inorganic compounds that can enter Perth's water supply through several pathways. The primary sources include:
- Agricultural fertilisers that leach into groundwater
- Animal waste runoff from farms and livestock areas
- Septic system leakage in areas without proper sewage infrastructure
- Natural deposits in soil that dissolve in rainwater
- Industrial waste and wastewater treatment effluent
In Perth's metropolitan area, Water Corporation maintains nitrate levels well below the Australian Drinking Water Guidelines of 50 mg/L (as nitrate). However, residents using bore water or those in agricultural regions may experience higher concentrations, particularly after heavy rainfall events that increase runoff into groundwater supplies.
The sandy soil profile of Perth's coastal plain allows nitrates to move relatively easily through the soil and into the groundwater, which serves as a source for some of Perth's drinking water. This geological feature makes ongoing monitoring particularly important for our region.
Potential Risks of Nitrates in Perth's Water
While most Perth residents receive water with safe nitrate levels, elevated concentrations can pose health risks to specific populations:
Health Impacts:
- Infants under six months are particularly vulnerable to nitrates because their digestive systems convert nitrates to nitrites more readily, potentially causing methaemoglobinaemia (blue baby syndrome)
- Pregnant women may be advised to monitor nitrate intake
- Individuals with specific medical conditions affecting oxygen transport in the bloodistry
Home System Impacts:
- Contributing to algae growth in pools, spas, and water features
- Affecting the taste of drinking water (sometimes described as slightly sweet or metallic)
- Potentially interfering with some industrial or brewing processes that require precise water chemistry
Recommended Filtration Solutions
Best Option: Reverse Osmosis System + Whole-House Filtration
This premium combination provides comprehensive protection against nitrates and other contaminants. The reverse osmosis system uses advanced technology to reject up to 96% of dissolved impurities, including nitrates, while the whole-house system provides protection for all other water uses throughout your home.
Key features:
- Eliminates up to 96% of nitrates and other dissolved contaminants
- Multi-stage filtration process ensures the highest quality drinking water
- Whole-house protection with comprehensive filtration
- Easy maintenance with quick-change cartridges
- Complete home protection against nitrates

Better Option: Dual-Stage Under-Sink System + Whole-House Filtration
This powerful combination offers excellent nitrate reduction for your drinking water while providing whole-house filtration for all other water uses.
Key features:
- 1-micron filtration for drinking water at your kitchen tap
- Targeted carbon filtration to reduce nitrates where you need it most
- Dual filter whole-house system provides protection for showering and appliances
- Cost-effective solution with excellent performance
- Balanced approach to nitrate reduction

Good Option: Under-Sink Drinking Water System
For households primarily concerned with nitrates in their drinking water, an under-sink system offers an affordable, effective solution that connects to your existing tap.
Key features:
- Easily installs under your sink
- Reduces nitrates in drinking and cooking water
- 1-micron filtration designed for Perth's water conditions
- Economical option with excellent results
- Targeted protection where it matters most

Concerned about nitrates in your water? Call us at (08) 9315 5545 or book a free consultation to discuss filtration solutions!
How We Can Help
As Perth's water quality specialists, we provide comprehensive solutions for nitrate concerns:
- Local expertise: Our technicians understand Perth's unique water quality challenges, including seasonal variations in nitrate levels across different suburbs
- Customised solutions: We assess your specific needs and water quality before recommending the right filtration system for your home
- Professional installation: Our licensed plumbers ensure your system is installed correctly for optimal performance
- Ongoing support: We provide maintenance services, replacement filters, and water quality testing to ensure your system continues to perform
We take pride in helping local families enjoy clean, safe water throughout their homes with filtration systems specifically designed for Perth's water conditions.
Protecting Your Home from Nitrates
While Perth's drinking water is generally safe and well-regulated, nitrate levels can vary, particularly for those using bore water or living in agricultural areas. Investing in a quality filtration system provides peace of mind and ensures your household has access to the purest water possible for drinking, cooking, and bathing.
The right filtration solution depends on your specific circumstances, water source, and budget. Our team is committed to helping you find the perfect system to address your nitrate concerns while also tackling other potential contaminants in your water supply.
Questions about nitrate filtration? Call us at (08) 9315 5545 or book an appointment online for personalised advice.
FAQs About Nitrates in Perth's Water
Nitrates primarily enter our water through agricultural runoff, septic system leakage, and natural soil deposits. Perth's sandy soil allows these compounds to move relatively easily into groundwater sources.
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