■In buildings, tap water is tested every six months! For specific buildings under the Building Sanitation Act, when drinking water is supplied from water supply facilities such as water storage tanks, management inspections continue even if the only water source is tap water. 1. Once every 6 months: 16 items including general bacteria, E. coli, lead, TOC, pH value, turbidity, etc. 2. Once a year from June 1 to September 30: 12 items 3. Once every 7 days: free residual chlorine ■What are the 12 items measured in summer? They include cyanide ions and cyanogen chloride, chlorate, chloroform, bromate, total trihalomethanes, and formaldehyde. The timing for measurement is specified by the enforcement regulations. ■Mixing well water increases the number of items tested For specific buildings that use groundwater as all or part of their water source, all items specified in the water quality standards are examined before the start of water supply. In addition to the above tests, 7 items such as trichloroethylene and benzene are tested once every three years. ■Are factory buildings included? Specific buildings are those with a total floor area of 3,000 square meters or more used for purposes such as stores, offices, or inns. Buildings used exclusively for schools must be 8,000 square meters or more. Factories are not included in the list of purposes specified by the government ordinance.

■Is well water in food factories tested at least once a year? According to the Food Sanitation Act Enforcement Regulations, when using "water suitable for drinking" other than tap water for food production, annual water quality testing is required, along with the retention of the test results for one year. A copy of the test results must also be attached when applying for a business license. Water used in processes that do not affect food safety, such as cooling, is exempt. If the test reveals that the conditions are not met, use must be immediately discontinued. If sterilization or purification devices are installed, their proper functioning must be regularly checked and recorded. ■Commercial wells are subject to national guidelines For drinking wells at business establishments that do not fall under the above categories, regular inspections must be conducted at least once a year according to the Hygiene Measures Guidelines for Drinking Wells (national guidelines). ■Organizing your own water source in four points! 1. Water source: Is it tap water, well water, or both? 2. Water storage tank: Is there one, and does it have an effective capacity exceeding 10 cubic meters? 3. Building: What is its purpose and total floor area? 4. Use: Is it used for food production? Our company accepts requests for water quality testing for drinking water, in addition to cleaning and inspecting water storage tanks. Please feel free to consult with us.