Minimum Frequency of Sampling for Drinking-Water Supply Systems for Microbiological Examination
Source and mode of Supply Population Served Minimum Frequency of Sampling
a. Level I 90 – 150 Once in three (3) months
b. Level II 600 Once in two (2) months
c. Level III Less than 5,000 1 sample monthly
5,000 – 100,000 1 sample per 5,000 population monthly
More than 100,000 20 samples and add’l one (1) sample per 10,000 population monthly
d. Emergency Supplies of Drinking Water Before delivery to users
e. Water Refilling Stations (product water) 1 sample monthly
f. Water Vending Machines (product water) 1 sample monthly
Minimum Frequency of Sampling for Drinking-Water Supply Systems for Physical and Chemical Analysis
Source and mode of Supply Minimum Frequency of Sampling
a. Level I Once a year
b. Level II
c. Level III
d. Emergency Supplies of Drinking Water
e. Water Refilling Stations Twice a year
f. Water Vending Machines

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