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Telephone: 045-847-6262 Fax: 045-848-4281
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Water quality inspection plan
Last Updated March 28, 2024
Based on the water safety plan, Yokohama City conducts integrated water quality management from water sources to hydrants. Water quality testing is essential to ensure that tap water meets water quality standards and is safe, and is at the core of tap water quality management. The water quality inspection plan stipulates points, items, frequency, and temporary water quality inspection policies from the water source to the hydrant in order to perform appropriate water quality management.
According to the provisions of the Water Supply Law, water utilities are required to formulate a water quality inspection plan before the start of each business year and provide information to customers.
2024 water examination plan (PDF: 3,234KB)
Contents of water quality inspection plan
- Basic Policy
- Outline of water supply business
- Water quality of raw water, purified water and faucet (water tap)
- Periodic inspection items, inspection frequency, inspection points and reasons
- Temporary water quality inspection
- Water quality inspection method
- Quality inspection accuracy and reliability assurance
- Publication of water quality inspection plans and test results
- Evaluation of test results and review of water quality inspection plans
- Cooperation with related parties
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Inquiries to this page
Water Quality Division, Water Works Bureau Water Purification Department
Telephone: 045-371-5656
Telephone: 045-371-5656
Fax: 045-371-6942
Email address: su-suishitsu@city.yokohama.lg.jp
Page ID: 626-856-557
