Hong Kong Tap Water Quality: What You Need to Know

Is Hong Kong Tap Water Safe to Drink?

Hong Kong's Water Supplies Department (WSD) consistently delivers water that meets the World Health Organization's (WHO) Guidelines for Drinking Water Quality. At the treatment plant, the water is safe. However, the journey from the treatment plant to your tap — through decades-old building pipes, storage tanks, and internal plumbing — is where problems can arise.

Common Water Quality Issues in Hong Kong Homes

Lead Contamination

In 2015, elevated lead levels were detected in the drinking water of several public housing estates in Hong Kong, traced to lead solder used in internal plumbing. While the government has since launched a voluntary lead-in-drinking-water testing scheme, older buildings may still have lead-containing pipes or fittings. Lead is particularly harmful to children and pregnant women.

Chlorine and Disinfection By-Products

Chlorine is added to Hong Kong's water supply as a disinfectant — a necessary step, but one that can leave an unpleasant taste and odour. Chlorine can also react with organic matter to form disinfection by-products (DBPs) such as trihalomethanes (THMs), which are associated with health risks at high levels.

Rust and Sediment

Aging iron pipes in older buildings can leach rust and sediment into your water, causing discolouration and a metallic taste. This is especially common in buildings constructed before the 1980s.

Bacteria and Microorganisms

Rooftop water storage tanks, if not properly maintained, can become breeding grounds for bacteria. While building management is required to clean tanks regularly, the frequency and thoroughness of cleaning varies.

What Contaminants Should You Filter For?

Based on Hong Kong's specific water quality profile, the most important contaminants to filter for are:

• Lead — from aging pipes and solder
• Chlorine and chloramines — from disinfection treatment
• Trihalomethanes (THMs) — disinfection by-products
• Rust and sediment — from corroding pipes
• Bacteria — from storage tanks
• PFAS (forever chemicals) — increasingly detected in water supplies globally

The Best Filtration Technology for Hong Kong Water

Reverse Osmosis (RO)

Reverse osmosis is the gold standard for comprehensive water purification. RO membranes filter out particles as small as 0.0001 microns, removing lead, heavy metals, bacteria, PFAS, nitrates, and dissolved solids. The AquaTru Countertop Purifier and AquaTru Under-Sink RO System are NSF-certified and proven to remove over 80 contaminants — making them ideal for Hong Kong homes.

Activated Carbon Filtration

Carbon filters are highly effective at removing chlorine, chloramines, THMs, and improving taste and odour. Many premium systems combine carbon pre-filtration with RO for comprehensive protection.

UV-C Purification

UV-C light destroys bacteria and viruses without chemicals. LARQ's UV-C purification technology is built into their bottles and pitchers, making it a great complement to a home filtration system for on-the-go use.

How to Test Your Home's Water Quality

You can request a free water quality test through Hong Kong's Water Supplies Department for lead testing. For a more comprehensive analysis, third-party laboratory testing services are available. Testing is especially recommended if you live in a pre-1990s building or have noticed discolouration, odour, or taste issues.

Take Action: Protect Your Family's Water

Don't leave your family's water quality to chance. Explore our water filters curated for Hong Kong homes or browse our full drinking water filter collection to find the right solution for your household.