Monitoring of inland waters The water
quality of more than 34 streams and 14 ponds in the
water catchment areas is monitored quarterly. Water
quality of the reservoirs within the water catchment
areas is jointly monitored by the Pollution Control
Department and the PUB.
Table 1 shows water quality based on dissolved
oxygen (DO), BOD and TSS between 2002 and 2010
(the data are shown as percentage of total samples
checked that meet the quality standard). Table 1 also
shows water quality in non-catchment areas. These
data are collected quarterly from 20 rivers and
streams in non-catchment areas. The data in Table 1
show that in both catchment and non-catchment
streams, water quality has remained consistently
good over these years, and also, that inland waters
are conducive to aquatic life.