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Annual water quality test report
Last Updated January 8, 2025
The "Water Quality Test Annual Report" summarizes the results of water quality tests and inspections conducted by Yokohama City based on the water quality inspection plan.
Annual water quality test report
2023 Annual Water Quality Test Report (PDF: 3,695KB)
Past Water Quality Test Annual Report
2022 Annual Water Quality Test Report (PDF: 3,905KB)
2021 Annual Report of Water Quality Test (PDF: 4,408KB)
2020 Water Quality Test Annual Report (PDF: 3,466KB)
2019 water quality test annual report (excerpt version) (PDF: 4,418KB)
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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: 756-328-233
