Grading System of Beaches
Gazetted beaches in Hong Kong are classified into four grades ( Grades 1 – 4 ) according to the level of E. coli in the water of the beaches. This is done by the Environmental Protection Department. Every week, water samples of each beach are collected for analysis to find out their bacterial level.
Grade 1 means that the water qualities of the beaches are good. The amount of E. coli is no more than 24 counts per 100 mL of beach water. Also no related case of skin and gastrointestinal illnesses has been reported by swimmers who have swum at these beaches.
Grade 2 means that the water qualities of the beaches are fair. The amount of E. coli is about 25 – 180 counts per 100 mL of beach water. Also the rate of skin and gastrointestinal illnesses is no more than 10 cases per 1000 swimmers.
Grade 3 means that the water qualities of the beaches are poor. The amount of E. coli is about 181 – 610 counts per 100 mL of beach water. Also the rate of skin and gastrointestinal illnesses is about 11 – 15 cases per 1000 swimmers.
Grade 4 means that the water quality is very poor. The amount of E. coli is greater than 610 counts per 100 mL of beach water. Also the rate of skin and gastrointestinal illnesses is greater than 15 cases per 1000 swimmers. As a result, swimmers are advised not to swim at Grade 4 beaches.
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