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What is the water quality testing of tap water? Inspection under Article 20 of the Water Supply Act [Basic Knowledge]

Who tests tap water, where, and how often? This explains the inspections under Article 20 of the Water Supply Act and how to check the water from the faucet.

Water quality testing of tap water refers to the inspections conducted by water service providers based on Article 20 of the Water Supply Act. Regular and emergency tests are mandated to determine whether tap water meets water quality standards. Regular tests are conducted to continuously monitor water quality and check for any abnormalities. Emergency tests are carried out when there are anomalies in the water source, indicating a potential failure to meet standards. ■ Is water only taken from water purification plants? The water used for testing is generally taken from the water supply faucet (tap). This approach checks the water that has reached the end point after passing through distribution pipes. For certain items where it is clear that concentrations do not increase during transmission or distribution, sampling at the outlet of the purification facility is also permitted. ■ What is checked in daily tests? Color, turbidity, and the residual effect of disinfection are tested more than once a day. These are items that verify daily whether there are abnormalities in color or turbidity and whether the disinfection effect is maintained until the end point. Additionally, the regulations require that free residual chlorine be maintained at 0.1 mg/L (or 0.4 mg/L for combined residual chlorine) in tap water through chlorination. Please feel free to consult us first.