Water quality measurement data

Water reclamation centers in the city conduct water quality tests for sewage flowing into the water reclamation center and water discharged into rivers and sea areas. In particular, discharge standards have been established for water discharged from water reclamation centers, and we confirm that the treatment can meet those standards.
This section makes an annual water quality test report summarizing the results of water quality tests every year.

Annual water quality tests have been released since 2004 and since 1970, 55, 1990, 7, and 12.
For other annual reports, please contact us.

Annual Report on Water Quality Test

Maps are color-coded for each water reclamation center treatment zone.

In addition to introducing the role of sewers in the water environment and the mechanism to clean dirty water, it also explains in an easy-to-understand manner using sewage water quality data until dirty water is cleared.

• Yokohama Sewer in terms of water quality (issued in March 2021) (PDF: 3,474KB)
• English Version(2016)（PDF：3,929KB）

In addition to introducing the role of sewers in the water environment and the mechanism to clean dirty water, it also explains in an easy-to-understand manner using sewage water quality data until dirty water is cleared.

Yokohama sewer Q & A (2016 version) to see in water quality (PDF: 1,597KB)

The summary of the survey and research on sewerage announced by this section (including the old affiliation name) has announced so far at the national sewerage research presentation and staff work presentations in the bureau. (Unauthorized reproduction and secondary use of the published summary is prohibited.)

Outline of research and research