There are 17 reservoirs and 9 irrigation reservoirs in Hong Kong. The Water Supplies Department closely monitors the water quality by means of physical, chemical, bacteriological and biological examinations of water samples taken at impounding reservoirs to ensure that ecological balance and good water quality in impounding reservoir are maintained. With their peaceful and scenic environments, the reservoirs are very popular fishing spots. Starting from 21 April 2022, they will be open all year round to public for fishing.