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2020 "delicious water of Yokohama" official approval

Last update date June 1, 2020

What's New

List of latest information
Update day Contents
May 7, 2020 We released summary of "delicious water of Yokohama" official approval in 2020.
June 1, 2020

We cancel holding of 1.2 grade official approval (venue examination). We carry out the third grade official approval (communication test by mail) sequentially.


With "delicious water of Yokohama" official approval

Modern water supply begins for the first time in Yokohama in Japan in 1887 (Meiji 20) and is sending safe, delicious water to customer now.
It has you know thing about overall tap water and various approaches of City of Yokohama, Water Works Bureau, and, also, it carries out "delicious water of Yokohama" official approval for the purpose of having it be in understanding person, cheering party for water supply business to have more customers understand "safety, taste" of tap water of Yokohama.

Official approval summary

2020 "delicious water of Yokohama" official approval

The third grade official approval (communication test by mail) [is carrying out]

Implementation period

From Thursday, May 7, 2020 to Friday, July 31

Undergoing an examination charges

Free of charge

Undergoing an examination qualification

The third grade official approval can have an examination in anyone.

Official approval summary

As for problem, the summary of the third grade official approval, please see leaflet (PDF: 916KB).

1.2 grade official approval (venue examination) [was called off]

Conduct day

Sunday, June 21, 2020
※For prevention of infection spread of new coronavirus, it should be cancellation.

Undergoing an examination charges

Free of charge

Undergoing an examination venue

The west public hall
(10-minute walk from Yokohama-sta.-nishiguchi, Sotetsu Line Hiranumabashi Station 8-minute walk)

Undergoing an examination qualification

We carry out the first grade official approval targeting at the second grade official approval passers until 2019.
We carry out the second grade official approval targeting at the third grade official approval passers until 2019.

Application reception desk period

From Thursday, May 7, 2020 to Friday, May 29 (effective postmark on that day)

Official approval summary

As for the summary of 1.2 grade official approval, please see this.

Reference page of undergoing an examination

  • Trip of hama pyon water(the third grade questions range)
  • Yokohama Channel guide (questions range of 1.2 grade)
  • City of Yokohama, Water Works Bureau press release material (for from April to September) (the first grade questions range)
  • City of Yokohama, Water Works Bureau press release material (for from October to February) (the first grade questions range)


Inquiry about water supply to Water Works Bureau customer Service Center

Water Works Bureau customer Service Center

Telephone: 045-847-6262 fax: 045-848-4281
※You run, and please be careful not to make any mistake

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Inquiry to this page

The "delicious water of Yokohama" official approval secretariat (the City of Yokohama, Water Works Bureau Planning Division)

Telephone: 045-671-3061

Telephone: 045-671-3061

Fax: 045-212-1158

E-Mail address [email protected]

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