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Water quality standards
Last update date April 1, 2024
Sewage water quality standards that can be drained from business establishments to public sewers are determined by the Sewerage Law for the purpose of preserving the facilities and functions of public sewerage and observing the water quality standards for effluent from wastewater treatment plants. .
In addition, specific water quality standards are as shown in the following table and are regulated as follows.
(a) Direct punishment standards (Article 12-2 of the Act (External Site), Ordinance Article 8-2 (External Site))
This standard is applied to specific business establishments in preference to the standards for setting up abatement facilities, and if sewage quality exceeds this standard, it may be immediately punished. (Article 46-2, Paragraphs 1 and 2 of the Act)
Regarding harmful substances such as cadmium and cyanide, regardless of the amount of wastewater, for phenols and copper, etc., the wastewater discharge is 50 m3 / day or more, and biochemical oxygen demand (BOD), suspended solids (SS), and normal hexane extract substance content (limited to animal and plant fat content) Business sites with a drainage volume of 2,000 m3 / day or more are eligible.
(b) Abatement facility setting standards (Article 12 (outside site), law Article 12-11 (outside site), ordinance Article 6 (outside site))
It is intended for all establishments that use the public sewer continuously, and if the quality of sewage exceeds this standard, it must install abatement facilities. If you exceed the standard, you will not be punished immediately, but you will be subject to supervision (Article 38, Paragraph 1 of the Act (external site)), and if you do not comply with the disposition, you will be punished. (Article 46 of the Act (External Site)）
| Items | Direct Punishment Standards | Standards for setting up abatement facilities |
|---|---|---|
| Cadmium and its compounds | 0.03 mg/L or less | 0.03 mg/L or less |
| Cyanide compounds | 1 mg/L or less | 1 mg/L or less |
| Organic phosphorus compounds (pesticides) | 0.2 mg/L or less | 0.2 mg/L or less |
| Lead and its compounds | 0.1 mg/L or less | 0.1 mg/L or less |
| Hexavalent chromium compounds | 0.2 mg/L or less (*2) | 0.2 mg/L or less |
| Arsenic and its compounds | 0.1 mg/L or less | 0.1 mg/L or less |
| Mercury, alkyl mercury and other mercury compounds | 0.005 mg/L or less | 0.005 mg/L or less |
| Alkyl hydrocarbon compound | Not detected | Not detected |
| Polychlorinated biphenyl | 0.003 mg/L or less | 0.003 mg/L or less |
| Trichloroethylene | 0.1 mg/L or less | 0.1 mg/L or less |
| Tetrachloroethylene | 0.1 mg/L or less | 0.1 mg/L or less |
| Dichloromethane | 0.2 mg/L or less | 0.2 mg/L or less |
| Carbon tetrachloride | 0.02 mg/L or less | 0.02 mg/L or less |
| 1,2-dichloroetan | 0.04 mg/L or less | 0.04 mg/L or less |
| 1,1-dichloroethylene | 1 mg/L or less | 1 mg/L or less |
| Cis-1,2-dichloroethylene | 0.4 mg/L or less | 0.4 mg/L or less |
| 1,1,1-trichloroethane | 3mg/L or less | 3mg/L or less |
| 1,1,2-trichloroethane | 0.06 mg/L or less | 0.06 mg/L or less |
| 1,3-dichloropropen | 0.02 mg/L or less | 0.02 mg/L or less |
| Tiuram | 0.06 mg/L or less | 0.06 mg/L or less |
| Zemadine | 0.03 mg/L or less | 0.03 mg/L or less |
| Thiobencarb | 0.2 mg/L or less | 0.2 mg/L or less |
| Benzene | 0.1 mg/L or less | 0.1 mg/L or less |
| Selenium and its compounds | 0.1 mg/L or less | 0.1 mg/L or less |
| Boron and its compounds | 10 mg/L [230 mg/L (*1)] or less (*2) | 10 mg/L [230 mg/L(*1)] or less |
| Fluorine and its compounds | 8 mg/L [15 mg/L (*1)] or less (*2) | 8mg/L [15mg/L (*1)] or less |
| Ammonia nitrogen, nitrite nitrogen and nitrate nitrogen content | Less than 380 mg/L (*2) | Less than 380 mg/L (*2) |
| 1,4-dioxane | 0.5 mg/L or less | 0.5 mg/L or less |
| Phenols | 0.5 mg/L or less (*3) | 0.5 mg/L or less |
| Copper and its compounds | 1 mg/L <3 mg/L (*4)> or below (*3) | 1 mg/L <3 mg/L (*5)> or less |
| Zinc and its compounds | 1mg/L <2mg/L (*4)> or below (*3) | 1 mg/L <2 mg/L (*5)> or less |
| Iron and its compounds (soluble) | 3mg/L <10mg/L (*4)> or below (*3) | 3mg/L <10mg/L(*5)> or less |
| Manganese and its compounds (soluble) | 1 mg/L or less (*3) | 1 mg/L or less |
| Chromium and its compounds | 2 mg/L or less (*3) | 2 mg/L or less |
| Hydrogen ion concentration (pH) | Beyond 5 and less than 9 (*3) | More than 5 and less than 9 |
| Biochemical Oxygen Demand (BOD) | Less than 600 mg/L (*6) | Less than 600 mg/L (*6) |
| Suspended Substances (SS) | Less than 600 mg/L (*6) | Less than 600 mg/L (*6) |
| Normal hexane extractor content (mine oil content) | 5 mg/L or less (*3) | 5 mg/L or less |
| Normal hexane extractor content (content of animal and fats) | 30 mg/L or less (*6) | 30 mg/L or less (*6) |
| Nitrogen content | Less than 120 mg/L (*7) | Less than 120 mg/L (*7) |
| Phosphorus content | Less than 16 mg/L (*7) | Less than 16 mg/L (*7) |
| Dioxins | 10pg-TEQ/L or less (*8) | 10pg-TEQ/L or less (*8) |
| Nickel and its compounds | --- | 1 mg/L or less |
| Appearance | --- | There must be no color or turbidity that significantly change the receiving sewage to be accepted or color or turbidity that increases turbidity |
| Temperature | --- | Less than 45 degrees |
| Orogenic consumption | --- | Less than 220 mg/L (*3) |
(Remarks)
*1
The water quality standards in this [] apply to business sites that are excluded from the water reclamation center(Note 1) where the water is discharged.
(Note 1) Water reclamation centers where the water is discharged. Northern second, central, southern part
*2
As a transitional measure, some industries have a provisional standard based on the Water Pollution Control Law for a certain period of time.
*3
Applicable to business establishments with an average daily discharge of 50 m3 or more.
*4
The water quality standards in this <> are specified business establishments excluded from the existing water reclamation center (Note 2) and existing specific business establishments excluded from the newly established water reclamation center (Note 3) Appended to specific business establishments other than "new establishment" prescribed in 1 (1) Remark 4). However, regarding the water quality standards for zinc and its compounds, the existing specific business sites to which the provisional standards apply are “3 mg / L” (until December 10, 2024).
(Note 2) Existing Water Reclamation Center: Central, South, Northern First, Sakae No.2, Kohoku
(Note 3) New Water Reclamation Center: Tsuzuki, Kanagawa, Kanazawa, West, Northern No. 2, Sakae Daiichi
(Note 4) Kanagawa Prefecture Ordinance: Ordinances that stipulate emission standards according to the provisions of Article 4, Paragraph 1 of the Air Pollution Control Law and drainage standards according to the provisions of Article 3, Paragraph 3 of the Water Pollution Control Law
*5
The water quality standards in this <> apply to business sites excluded from the existing water reclamation center (Note 2).
*6
Applies to business sites with an average daily discharge of 2,000 m3 or more.
*7
Water Reclamation Center (Note 5) where the average amount of effluent per day is 50 m3 or more and is discharged to Tokyo Bay and the public water bodies flowing into it (hereinafter referred to as the “Tokyo Bay Basin”) Applies to business sites to be excluded.
(Note 5) Water reclamation centers with the Tokyo Bay basin. Northern first, northern second, Kanagawa, Chubu, South, Kanazawa, Kohoku, Tsuzuki
*8
| Type of business sites | Applicable standards and water quality standards |
|---|---|
| Business establishments that set up facilities subject to water quality standards (*a) | Direct Punishment Criteria: 10pg-TEQ/L |
| Other business sites | Standards for installation of abatement facilities: 10pg-TEQ/L(*b) |
*a
Facilities listed in Appendix 2 of the Enforcement Order of the Law Concerning Special Measures against Dioxins
*b
A water reclamation center that treats sewage containing sewage or wastewater from facilities subject to water quality standards or sewage discharged from business sites where facilities subject to air standards (*c) are installed (hereinafter referred to as `` Water to which dioxin wastewater standards apply) Applicable only when excluded to the recycling center).
[Water reclamation center to which dioxin wastewater standards are applied]
Northern second, Kanagawa, Kohoku, Tsuzuki, Kanazawa, southern part
*c
Facilities listed in Appendix 1 of the Ordinance for Enforcement of the Special Measures against Dioxins, which were installed after April 1, 2003.
For inquiries to this page
Yokohama City Sewerage River Bureau Water Quality Section Factory
Phone: 045-671-2835
Phone: 045-671-2835
Fax: 045-550-4183
Email address: gk-kouhai@city.yokohama.lg.jp
Page ID: 419-339-161
