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FAQs - Water Quality


What is the radiological monitoring arrangement for water supply in Hong Kong?

The Water Supplies Department (WSD) monitors continuously the radioactivity levels of the Dongjiang water supply 24 hours round the clock through the On-line Water Contamination Monitoring System installed at Muk Wu Pumping Stations. Furthermore, regular samples are also taken from the entire water supply system including Muk Wu Pumping Stations, local catchwaters, impounding reservoirs, water treatment works and distribution networks including consumers' taps for radiological analysis. Every year, the WSD takes about 1,200 raw water and 1,600 treated water samples from the entire water supply system for radiological analysis.  

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 In the aftermath of the nuclear power plants incident in Fukushima Prefecture of Japan, is there any impact on the quality of water supply in Hong Kong?

Since 11 March, the WSD has stepped up the radiological monitoring by taking raw and treated water samples from water treatment works and impounding reservoirs for radiological analysis. Our monitoring results indicate that artificial radionuclides are not detected in the Dongjiang water, impounding reservoirs and treated water samples. There are no observable changes in the radioactivity levels before and after the nuclear power plants incident in Fukushima Prefecture. The radioactivity levels of water supply are well below the safety limits recommended by the International Atomic Energy Agency. The radiological quality of drinking water in Hong Kong is perfectly safe for consumption.

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Is the tap water at my home potable?

copper pipe
copper pipe
lined galvanized steel pipe
lined galvanized steel pipe
polyethylene pipe
polyethylene pipe
rusty unlined galvanized steel pipe
rusty unlined galvanized steel pipe
double sealed tank cover with lock
double sealed tank cover with lock
damaged water tank cover
damaged water tank cover
water tank not cleaned
water tank not cleaned
rusty water tank cover
rusty water tank cover
storage tank without proper maintenance and management
storage tank without proper
maintenance and management
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Is Hong Kong's treated water safe for consumption?

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Why does the tap water contain a smell of chlorine?

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Why are sediments always found in my electric kettle?

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Is it necessary to install a domestic water filter (including that incorporated in a drinking fountain or other similar water using apparatus)?

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Why does tap water at my home appear milky? Is there something wrong with the water quality?

Water in the plumbing system under pressure will contain more dissolved air. When the pressure drops, the dissolved air in water will be released into the water body forming numerous air bubbles, which makes the water look like milky in colour. When this condition occurs, try allowing the tap water to run for a moment or let the water stand in a container for a while. The water will become clear again as the air bubble escapes. Such phenomenon will not affect the quality of the drinking water.

 

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Why water supply from Water Supplies Department becomes turbid and yellowish when the supply resumes from a period of suspension?

When water supply from Water Supplies Department (WSD) resumes from a period of suspension, the sediments inside water mains may be stirred up resulting in water supply with slightly higher turbidity than normal. The contents of sediments accumulated in water mains are mainly lime, traces of iron or minerals but these sediments will not pose risks to our health or safety of water supply. In case the incident occurs, the WSD will flush our water mains at the fire hydrants in the affected areas so as to drain away the water until its clarity resumes normal. If the situation persists, the WSD will arrange water wagons to provide temporary water supply to the public in the affected areas. Management Offices of premises can also inspect their roof tanks and inside service. If water with high turbidity is observed, the Management Offices can drain the roof tanks to allow the intake of clear water as soon as possible.