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- Obligation to measure and report water quality
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Obligation to measure and report water quality
Last updated on November 5, 2024.
1.Obligation to measure water quality (Article 12-12 of the Act (outside site), Ministerial Ordinance Article 15 (outside site), Ordinance Article 11 (outside site), Regulations Article 16 (outside site), Article 16-2 (outside site) (outside site)))
Business establishments that have specific facilities or abatement facilities must measure the water quality in the following ways, record the results, and save them.
(a) The measurement method should be performed according to the measurement method specified in the ministerial ordinance on the certification method of sewage water quality.
(b) For the number of measurements, please perform the number specified in the regulations for each item and the amount of drainage. The number of measurements for each measurement item is as shown in the following table.
(c) Samples for measurement should be taken from the middle part of the water depth at the time when the quality of the sewage to be measured is estimated to be the worst.
(d) Samples should be collected at the outlets and exits of abatement facilities.
(Ministry Ordinance Article 15 No. 4 (External Site), Ordinance Article 11 (External Site))
(o) Please keep the measurement results for 5 years.
※Water quality measurement record table: Emission outlets → Style 13th (word: 25KB), exit of abatement facilities, etc. → No. 11 style (word: 15KB)
2.Duty to report (Article 39-2 of the Act (outside site), ordinance Article 12 (outside site))
The installer of the specific facility and the installer of the abatement facility have a duty to report the necessary limit from Yokohama City to properly manage the sewer. Even if the drainage meets the water quality standards due to the establishment of an abatement facility by a non-specific business establishment, a report based on the ordinance must be made as long as the abatement facility is installed.
Penalties may be applied to those who do not report or make false reports in violation of this provision. (Act Article 49 No. 5 (outside site), Ordinance Article 45 No. 5 (outside site))
＊Please refer to the following organizations about analysis organization when requesting water quality measurement to the outside.
| Contact information | TEL |
|---|---|
| Yokohama City Environmental Technology Council (http://www.yokokankyo.com/ (outside site)) | 045-782-1170 |
Kanagawa Environmental Measurement Council (https://shinkankyou.com/ (outside 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 and alkyl mercury and other mercury compounds Polychlorinated biphenyl Selenium and its compounds | At least once every drainage period that does not exceed 14 days | |
Boron and its compounds | At least once per drainage period that does not exceed one month | |
Boron and its compounds | At least once every drainage period that does not exceed 14 days | |
| Trichloroethylene Tetrachloroethylene Dichloromethane Carbon tetrachloride 1,2-dichloroethane 1,1-dichloroethylene Cis-1,2-dichloroethylene 1,1,1-trichloroethane 1,1,2-trichloroethane 1,3-dichloropropene Chiuram Zimazine Thiobencarb Benzene 1,4-dioxane | At least once per drainage period that does not exceed one month | |
| Dioxins (Refers to dioxins in Article 2 (outside site) of the Law Concerning Special Measures against Dioxins (Act No. 105 of 1999)) | 1 or more times for each drainage period not exceeding one year | |
| Temperature Hydrogen ion concentration | At least once a day during the drainage period | |
Contains ammonia nitrogen, nitrite nitrogen, nitrite nitrogen, nitrate nitrogen, etc. | At least once every drainage period that does not exceed three months | |
Contains ammonia nitrogen, nitrite nitrogen, nitrite nitrogen, nitrate nitrogen, etc. | At least once every drainage period that does not exceed two months | |
Contains ammonia nitrogen, nitrite nitrogen, nitrite nitrogen, nitrate nitrogen, etc. | At least once per drainage period that does not exceed one month | |
Biochemical Oxygen Demand | At least once every time a drainage period not exceeding one year | |
Biochemical Oxygen Demand | At least once every drainage period that does not exceed three months | |
Biochemical Oxygen Demand | At least once every drainage period that does not exceed two months | |
Biochemical Oxygen Demand | At least once every drainage period that does not exceed 14 days | |
Normal hexane extract content | At least once every drainage period that does not exceed three months | |
Normal hexane extract content | At least once per drainage period that does not exceed one month | |
Normal hexane extract content | At least once every drainage period that does not exceed 14 days | |
Others | At least once per drainage period that does not exceed one month | |
Others | At least once every drainage period that does not exceed 14 days | |
(Remarks) *1
Business sites that exclude Tokyo Bay and public water bodies (hereinafter referred to as the "Tokyo Bay Basin") with an average daily discharge of 50 m3 or more and are discharged into the water reclamation center. Apply to
(Note) Water Reclamation Center whose discharge destination is the Tokyo Bay basin: Northern 1st, Northern 2nd, Kanagawa, Chubu, Southern, Kanazawa, Kohoku, Tsuzuki
Water Reclamation Center with discharges outside the Tokyo Bay basin: West, Sakae Daiichi, Sakae Daini
Inquiries to this page
Water Quality Division, Sewerage and Rivers Bureau Sewerage Facilities Department
Phone: 045-671-2835
Phone: 045-671-2835
Fax: 045-550-4183
E-Mail address [email protected]
Page ID: 164-465-417
