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- Obligation to measure water quality and report
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Obligation to measure water quality and report
Last Updated January 22, 2024
1.Obligation of water quality measurement (Article 12-12 of the Act (external site), Ministerial Ordinance Article 15 (outside site), Ordinance Article 11 (outside site), Rule 16 (outside site), Article 16-2 (External site)))
Business establishments that have set up specific facilities and abatement facilities must measure the water quality in the following ways, record the results, and save them.
(a) The measurement method should be performed using the measurement method specified in the ministerial ordinance on the test method of sewage water quality.
(b) For the number of measurements, perform the number of times specified by the ordinance for each item and the amount of wastewater. The number of measurements for each measurement item is shown in the following table.
(c) Specimens for measurement should be taken from the middle of the water depth at the time when the quality of the sewage to be measured is estimated to be the worst.
(e) Samples should be collected at the outlet and exits of the abatement facility.
(Ministry Ordinance, Article 15 No. 4 (external site), Ordinance Article 11 (external site))
(O) Save the measurement results for 5 years.
※Water quality measurement record table: Emission outlets → Style 13 (word: 25KB), exits such as abatement facilities → Eleventh style (word: 15KB)
2.Report obligations (Article 39-2 of the Act (External Site), Ordinance Article 12 (External Site)))
The installer of the specific facility and the installer of the abatement facility have an obligation to report when a report of the necessary limit to properly manage the sewerage system. Even if the drainage satisfies the water quality standards due to the establishment of abatement facilities, a report based on the ordinance must be made as long as the abatement facility is installed.
Penalties may also apply to those who fail to report or make a false report in violation of this provision. (Article 49 No. 5 (outside site), Ordinance Article 45 No. 5 (outside site))
＊Please refer to the following organizations for an analysis organization when requesting water quality measurement externally.
| Contact information | Phone number |
|---|---|
| Yokohama City Environmental Technology Council (http://www.yokokankyo.com/ (external site)) | 045-782-1170 |
Kanagawa Prefecture Environmental Measurement Council (http://www.shinkankyou.com/ (external site))) | 045-790-5280 |
| Water quality items | Number of measurements | |
|---|---|---|
| Cadmium and its compounds Cyanide compounds Organic phosphorus compounds Lead and its compounds Hexavalent chromium compounds Arsenic and its compounds Mercury, alkyl mercury and other mercury compounds Polychlorinated biphenyl Selenium and its compounds | At least once every drainage period not exceeding 14 days | |
Boron and its compounds | At least once for each drainage period not exceeding one month | |
Boron and its compounds | At least once every drainage period not exceeding 14 days | |
| Trichloroethylene Tetrachloroethylene Dichloromethane Carbon tetrachloride 1,2-dichloroetan 1,1-dichloroethylene Cis-1,2-dichloroethylene 1,1,1-trichloroethane 1,1,2-trichloroethane 1,3-dichloropropen Tiuram Zemadine Thiobencarb Benzene 1,4-dioxane | At least once for each drainage period not exceeding one month | |
| Dioxins (Refers to dioxins in Article 2 (outside site) of the Law Concerning Special Measures against Dioxins (Act No. 105 of 1999).) | At least once every drainage period not exceeding one year | |
| Temperature Hydrogen ion concentration | At least once a day during drainage period | |
Contains ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, etc. | At least once for each drainage period not exceeding three months | |
Contains ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, etc. | At least once for each drainage period not exceeding two months | |
Contains ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, etc. | At least once for each drainage period not exceeding one month | |
Biochemical Oxygen Demand | At least once every drainage period not exceeding one year | |
Biochemical Oxygen Demand | At least once for each drainage period not exceeding three months | |
Biochemical Oxygen Demand | At least once for each drainage period not exceeding two months | |
Biochemical Oxygen Demand | At least once every drainage period not exceeding 14 days | |
Normal hexane extractor content | At least once for each drainage period not exceeding three months | |
Normal hexane extractor content | At least once for each drainage period not exceeding one month | |
Normal hexane extractor content | At least once every drainage period not exceeding 14 days | |
Others | At least once for each drainage period not exceeding one month | |
Others | At least once every drainage period not exceeding 14 days | |
(Remarks) *1
Business sites that have an average effluent per day is 50 m3 or more and that excludes Tokyo Bay and the public water bodies flowing into it (hereinafter referred to as the “Tokyo Bay Basin”) to the water reclamation center where the water is discharged. Apply.
(Note) Water Reclamation Center with discharge destination in Tokyo Bay basin: Northern first, northern second, Kanagawa, Chubu, South, Kanazawa, Kohoku, Tsuzuki
Water reclamation center with discharge destinations outside the Tokyo Bay basin West, Sakae Daiichi and Sakae Daini
For inquiries to this page
City of Yokohama, Environmental Planning Bureau Environmental Conservation Department Water and Soil Environment Division
Phone: 045-671-2835
Phone: 045-671-2835
Fax: 045-671-2809
Email address: ks-kouhai@city.yokohama.jp
Page ID: 164-465-417
