What is a water quality inspection for dedicated water supply and simple dedicated water supply? 【Basic Knowledge】

basic information

■Dedicated water supply is tested for all water quality standards! Dedicated water supplies are subject to the water quality inspection regulations of water supply operators. The main frequencies are as follows: 1. Daily: Color, turbidity, and residual disinfection effects at least once a day. 2. Generally at least once a month: General bacteria, E. coli, organic matter (TOC), chloride ions, pH value, taste, odor, color, turbidity. 3. Generally at least once every three months: Many other items not mentioned above. PFOS and PFOA are also generally tested at least once every three months. ■Record keeping and outsourcing, inspection plans Records of inspections must be kept for five years from the date of inspection. Inspections can be conducted by oneself, and outsourcing to local government agencies or registered water quality inspection organizations is also permitted. It is also required to establish a water quality inspection plan before the start of each business year. ■When can the frequency be reduced? If there is little risk of significant changes in the quality of the raw water and if the results from the past three years are all below one-fifth of the standard values, some items can be tested generally once a year. If they are below one-tenth, then generally once every three years. However, this does not apply if the type of water source, water intake location, or water purification method has changed in the past three years.

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■Is the simple dedicated water supply not one of the 52 items? The installer of a simple dedicated water supply must undergo inspection by a local government agency or a nationally registered agency at least once a year. According to national notifications, inspections are generally defined as follows: 1. Facilities: Confirm the risk of wastewater entering without draining the water from the tank and check for the presence of sediment. 2. Water from the supply faucet: Ensure there are no abnormalities in odor, taste, or color; color should be below 5 degrees; turbidity below 2 degrees; and residual chlorine should be detectable. 3. Documents: Drawings of the facilities, records of tank cleaning, etc. ■Reason for checking residual chlorine Residual chlorine is an item that focuses on its consumption due to long-term stagnation of water, contamination of tanks and pipes, and the mixing of wastewater. ■Annual cleaning is also a requirement! As a management standard, it is stipulated that tank cleaning must be conducted regularly at least once a year. If any abnormalities are recognized in the color, turbidity, odor, or taste of the water from the supply faucet, necessary items from the water quality standards will be inspected. Additionally, for buildings subject to the Building Sanitation Act, inspections can also be conducted based on documents prepared by the installer. ■Cleaning and water quality inspection Torii handles the cleaning and inspection of water storage tanks along with water quality testing. Please feel free to consult us first.