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Trust of water quality test

Last update date March 15, 2019

In City of Yokohama, Water Works Bureau, we started duties to be given a part of the water quality test of all of water supply company and the water supply water supply companies in trust for a fee.

Trust object,

  • Alien substance which went out of water supply facilities
  • Cryptosporidium in water supply Haramizu
  • Underwater living thing

It is equal no examination.

In addition, about water supply standard of water 51 items, we provide consultation if there are any requests.

Flyer "began trust of water quality test" (PDF: 642KB)

Examination of alien substance which went out of water supply facilities

Rate (per 1 sample): 19,300 yen (consumption taxes)

Image of black rubber (packing)
Black rubber (packing)

Image of iron rust (superannuation pipe)
Iron rust (superannuation pipe)


Examination of cryptosporidium in water source, Haramizu

Rate (per 1 sample): 54,100 yen (consumption taxes)

Cryptosporidium microscope image (nucleus of suporozoido)
Microscope image (nucleus of suporozoido) of cryptosporidium

Cryptosporidium microscope image (oshisuto outer wall)
Microscope image (oshisuto outer wall) of cryptosporidium


Underwater living thing examination

Rate (per 1 sample): 19,300 yen (consumption taxes)

Image of anabaena (smell living thing)
Anabaena (smell living thing)

Image of orakoseira (filtration disorder)
orakoseira (filtration disorder)

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
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Inquiry to this page

The Water Works Bureau clean water part quality of the water section

Telephone: 045-371-5656

Telephone: 045-371-5656

Fax: 045-371-6942

E-Mail address [email protected]

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Page ID: 519-619-840

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