For inquiries about water supply, please contact Water Works Bureau Customer Service Center.
Water Works Bureau Customer Service Center
Telephone: 045-847-6262 Fax: 045-848-4281
※Please be careful not to make a mistake.
Water quality test results
Final update date April 19, 2021
About water quality inspection
Water quality inspections have confirmed that tap water delivered to customers conforms to the water quality standards of the Water Supply Law. In Yokohama City, we conduct water quality tests not only at water taps (faucets) that are required as places for water quality inspections, but also at entrances and water sources at water purification plants.
Water quality test results
Monthly water taps and water quality test results at water purification plants are divided into Excel workbook sheets.
The number (frequency) of inspections differs for each inspection location and item. Please refer to the water quality inspection plan for details on the location, items, number of inspections, etc. of the water quality inspection.
Please refer to here for commentary on 51 water quality standards.
Water tap (faucet)
2020 Water quality test results (water tap) (Excel: 97KB)
2019 water quality test result (water tap) (Excel: 92KB)
2018 water quality test result (water tap) (Excel: 90KB)
Water Purification Plant
2020 Water Quality Test Results (Water Purification Plant) (Excel: 89KB)
2019 Water Quality Test Results (Water Purification Plant) (Excel: 84KB)
2018 Water Quality Test Results (Water Purification Plant) (Excel: 84KB)
Inquiries to this page
Water Works Bureau Water Purification Department Water Quality Division
Telephone: 045-37-5656
Telephone: 045-37-5656
Fax: 045-37-6942
Email address: [email protected]
