For inquiries regarding water supply, please contact the Water Works Bureau Customer Service Center.
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Telephone: 045-847-6262 Fax: 045-848-4281
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Annual water quality test report
Last Updated September 18, 2024
The "Water Quality Test Annual Report" summarizes the results of tap water quality tests and inspections conducted in Yokohama City.
We confirm the safety of tap water quality by conducting water quality tests at inspection points established by Yokohama City.
Please refer to the water quality inspection items for explanations of 51 water quality standards.
Annual water quality test report
2023 Annual Water Quality Test Report (PDF: 3,695KB)
Past Water Quality Test Annual Report
FY2022 Water Quality Test Annual Report (Batch Download) (PDF: 3,905KB)
2021 Annual Report of Water Quality Test (Batch Download) (PDF: 4,408KB)
2020 Water Quality Test Annual Report (Batch Download) (PDF: 3,466KB)
2019 water quality test annual report (excerpt version: batch download) (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
