A few disease organisms in a single glass of water can cause illness. Thus water quality testing is done quite frequently. A new system typically samples four times a year or once a quarter for each quarter the system is open. The number of sample taken is based on the population and the configuration of the system . Chemical Monitoring Water quality testing for chemicals contaminant on the other hand is much less frequent.
Chronic exposure is over a long period is usually necessary to experience a risk to health.
Nitrate sampling is required once a year and nitrate sampling needs to be done once every three years. The Water Supply Engineering Bureau staff inspect all NCWS every five years. There is no cost for this inspection. The system owner is responsible for payment of all water quality testing associated with the field inspection. Design Approval of Changes to The Existing System Design review approval is needed for all changes to the water system.