■Is the number of inspections uniform nationwide? The frequency of inspections is generally determined for each water quality standard item. Items such as E. coli, general bacteria, turbidity, and TOC (organic matter) are generally inspected at least once a month, while many other items are inspected at least once every three months. However, if the quality of the raw water is unlikely to change due to the conditions of the water source, or if past results are significantly below the standard values, the frequency can be reduced or omitted. Therefore, even for the same item, the frequency may differ among water service providers. ■Does the inspection for musty odor change with the season? The inspection for geosmin and 2-methylisoborneol, which cause musty odors, is generally conducted at least once a month. Periods when the algae that produce these substances are scarce and do not require inspection are excluded. ■Inspection plans are made annually Water service providers create a water quality inspection plan before the start of each business year. The plan includes the items to be inspected, the sampling locations, the frequency and reasons for inspections, items to be omitted and their reasons, and details of any outsourcing. ■Self-operated inspection facilities or outsourcing? The principle is to establish inspection facilities independently. There is also the option to entrust inspections to registered water quality inspection organizations or local government agencies.

■Where can I see the results? Water suppliers are obligated to provide information in a way that is easily accessible to consumers. The water quality testing plan must be provided before the start of the fiscal year, results of regular tests must be provided at least once a year, and results of emergency tests must be promptly provided when necessary. ■What should I do if I want the tap water to be tested? According to Article 18 of the Water Supply Act, individuals receiving water supply can request water quality testing from the water supplier. The water supplier will promptly conduct the test and notify the results. The same article allows for requests for inspections of water supply equipment. Please check with each water supplier for the procedures. ■Buildings with water storage tanks also require management by the installer In buildings supplied with water through a water storage tank, the responsibilities of the water supplier and the installer of the water storage tank are defined by each water supplier's supply regulations. The water quality beyond the water storage tank is also influenced by the management conditions of the installer. ■Simple measurements are the starting point for judgment Tests to determine compliance with water quality standards are conducted according to methods established by the Minister of the Environment. If a simple measurement yields concerning values, there are ways to consult with organizations that can conduct tests using that method. Our company also accepts inquiries about water quality testing in conjunction with inspections and cleaning of water storage tanks. Please feel free to contact us first.