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Total water quality regulation
Total amount regulation under the Water Pollution Control Law
Last Updated November 15, 2024
Total amount reduction system
Overview of the Total Amount Reduction System
- Water areas that are closed, such as Tokyo Bay, have a significant increase in pollution load due to population and concentration of industry. For this reason, the Water Pollution Control Law has established a total amount regulation in addition to concentration regulations (Article 4-2 of the Act).
- Specifically, Tokyo Bay is designated as a designated water area, and in order to secure chemical oxygen demand (COD), nitrogen, and phosphorus water quality environmental standards, the total amount of pollutant load flowing into Tokyo Bay is planned and stepwise. It is a system that tries to reduce it.
- It was introduced in 1978 by the revision of the Water Pollution Control Law, and is now the ninth.
9th Total Reduction
- On January 24, 2022, the Ministry of the Environment (MOE)Basic policy on reducing total amount of chemical oxygen demand, nitrogen content and phosphorus content (external site)(Tokyo Bay) I've decided it.
- On November 4, 2022, Kanagawa Prefecture9th Total Reduction Plan for Chemical Oxygen Demands in Tokyo Bay (outside site)I've decided it.
Subject to the total amount regulation
Of the specified business establishments that drain into public water bodies that connect to Tokyo Bay or Tokyo Bay and flow into public water bodies, the average daily discharge water volume is 50 cubic meters or more
Details of the notification
Those who are subject to the total amount regulation must submit the following notification.
| Details of notification | Notification requirements |
|---|---|
| Pollution load measurement method registration form | We will notify you in advance in the following cases.
|
| registration form of the contamination status and amount of discharged water by drainage system | If the location is newly designated area, you will be notified within 60 days. |
Please refer to the report page when submitting a report.
Measurement, recording, and reporting of pollution loads, etc.
Measurement and recording of pollutant load
- The pollutant load of the specified effluent must be measured using the prescribed measurement method and frequency, and the results must be stored for 3 years. (Article 14, Paragraph 2 of the Act)
- Specified effluents are effluents used for business activities and other human activities at a specific business site, and are subject to pollution load when used exclusively for cooling, decompression, and other purposes. Means water other than those provided for those whose amount does not increase.
- The measurement of the pollutant load measures the COD, nitrogen content, phosphorus content concentration and specified amount of discharged water, and calculates the pollutant load per day of the specified effluent.
| Pollution load | Calculation formula |
|---|---|
| Measured value (kg/day) | Specified amount of water discharged (m3/day) x concentration (mg/L) ÷ 1,000 |
| Standard value (kg/day) | Notification of specified amount of water discharged Maximum value (m3/day) x standard concentration (mg/L) / 1,000 |
Standard concentrations vary depending on the type of business and when it was installed.
For details, please check the website of Kanagawa Prefecture (outside site).
For details on measurement methods, please refer to the website of the Ministry of the Environment.
- The number of measurements varies depending on the daily average amount of water discharged.
| Daily average amount of water discharged | Number of measurements |
|---|---|
| More than 400 cubic meters | Every day |
| 200 cubic meters or more and less than 400 cubic meters | At least once every 7 days |
| 100 cubic meters or more and less than 200 cubic meters | At least once every 14 days |
| 50 cubic meters or more and less than 100 cubic meters | At least once every 30 days |
Reporting results of pollutant load measurement
Please report on the measurement results of the pollution load measurement, etc. for the purpose of understanding the measurement implementation status and the pollutant load amount, and contributing to environmental conservation in Tokyo Bay.
| Daily average amount of water discharged | Report frequency |
|---|---|
| More than 1,000 cubic meters | Every month |
| 400 cubic meters or more and less than 1,000 cubic meters | Every two months |
| 50 cubic meters or more and less than 400 cubic meters | Every 6 months |
- Report Form:Excel (Excel: 32KB)(Please submit in principle in Excel.)
- How to submit: Email (email)Electronic application (outside site)It is also possible to submit the documents in writing.
- Submission: Water and Soil Environment Division, Green Environment Bureau
- Email address: mk-mizu@city.yokohama.lg.jp
Review of automatic measuring instrument correlation, management standards and failure status reports
- Review report of correlation coefficients of UV meters, etc. in COD measurement (Number of samples used to create conversion formulas: 20 or more)
- Report on management standards for all nitrogen total phosphorus automatic measuring instruments
- Report of failure status of automatic measuring instruments
- Report frequency: Every 6 months
- Reference Form:Excel (Excel: 18KB)
- attached documents: Reference materials for the creation of correlation coefficients and conversion formulas, data on management standards, and other necessary materials
- How to submit: Email (email)Electronic application (outside site)It is also possible to submit the documents in writing.
- Submission: Water and Soil Environment Division, Green Environment Bureau
- Email address: mk-mizu@city.yokohama.lg.jp
Inquiries to this page
Water and Soil Environment Division, Environmental Conservation Department, Green Environment Bureau
Telephone: 045-671-2489
Telephone: 045-671-2489
Fax: 045-671-2809
Email address: mk-mizu@city.yokohama.lg.jp
Page ID: 437-322-529
