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Water quality standards
Last Updated November 5, 2024
Water quality standards for sewage that can be drained from business establishments to public sewers are stipulated by the Sewerage Law for the purpose of preserving facilities and functions of public sewers and observing the water quality standards for effluent from wastewater treatment plants. I am.
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 (outside site), Ordinance Article 8-2 (outside site))
This standard is applied to specific business establishments in preference to the standards for setting up abatement facilities, and may be punished immediately if the quality of sewage exceeds this standard. (Article 46 of the Act (outside site))
Hazardous substances such as cadmium and cyanide are irrespective of the amount of wastewater, and phenols and copper are 50 m3 / day or more, biochemical oxygen demand (BOD), suspended matter mass (SS), Normal hexane extract content (limited to animal and vegetable oils and fats) For business establishments with a drainage amount of 2,000m3 / day or more are eligible.
(b) Abatement facility setting standards (Article 12 of the Act (outside site), Article 12-11 of the Act (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, abatement facilities must be set up. 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 will be punished if you do not comply with the disposition. (Article 45 of the Act (outside site)）
| Items | Direct punishment standard | Standards for setting up abatement facilities |
|---|---|---|
| Cadmium and its compounds | 0.03mg/L or less | 0.03mg/L or less |
| Cyanide compounds | 1mg/L or less | 1mg/L or less |
| Organic phosphorus compounds (pesticides) | 0.2mg/L or less | 0.2mg/L or less |
| Lead and its compounds | 0.1mg/L or less | 0.1mg/L or less |
| Hexavalent chromium compounds | 0.2mg/L or less (*1) | 0.2mg/L or less |
| Arsenic and its compounds | 0.1mg/L or less | 0.1mg/L or less |
| Mercury and alkyl mercury and other mercury compounds | 0.005mg/L or less | 0.005mg/L or less |
| Alkyl mercury compounds | Not detected | Not detected |
| Polychlorinated biphenyl | 0.003mg/L or less | 0.003mg/L or less |
| Trichloroethylene | 0.1mg/L or less | 0.1mg/L or less |
| Tetrachloroethylene | 0.1mg/L or less | 0.1mg/L or less |
| Dichloromethane | 0.2mg/L or less | 0.2mg/L or less |
| Carbon tetrachloride | 0.02mg/L or less | 0.02mg/L or less |
| 1,2-dichloroethane | 0.04mg/L or less | 0.04mg/L or less |
| 1,1-dichloroethylene | 1mg/L or less | 1mg/L or less |
| Cis-1,2-dichloroethylene | 0.4mg/L or less | 0.4mg/L or less |
| 1,1,1-trichloroethane | 3mg/L or less | 3mg/L or less |
| 1,1,2-trichloroethane | 0.06mg/L or less | 0.06mg/L or less |
| 1,3-dichloropropene | 0.02mg/L or less | 0.02mg/L or less |
| Chiuram | 0.06mg/L or less | 0.06mg/L or less |
| Zimazine | 0.03mg/L or less | 0.03mg/L or less |
| Thiobencarb | 0.2mg/L or less | 0.2mg/L or less |
| Benzene | 0.1mg/L or less | 0.1mg/L or less |
| Selenium and its compounds | 0.1mg/L or less | 0.1mg/L or less |
| Boron and its compounds | 10mg/L [230mg/L (*2)] below (*1) | 10mg/L [230mg/L(*2)] or less |
| Fluorine and its compounds | 8mg/L [15mg/L(*2)] below (*1) | 8mg/L [15mg/L(*2)] or less |
| Ammonia nitrogen, nitrite nitrogen, nitrite nitrogen and nitrate nitrogen content | Less than 380mg/L (*1) | Less than 380mg/L (*1) |
| 1,4-dioxane | 0.5mg/L or less | 0.5mg/L or less |
| Phenols | 0.5mg/L or less (*3) | 0.5mg/L or less |
| Copper and its compounds | 1mg/L <3mg/L (*4)> Below (*3) | 1mg/L <3mg/L(*5)> or less |
| Zinc and its compounds | 1mg/L <2mg/L (*4)> Below (*3) | 1mg/L <2mg/L(*5)> or less |
| Iron and its compounds (solubility) | 3mg/L <10mg/L (*4)> Below (*3) | 3mg/L <10mg/L(*5)> or less |
| Manganese and its compounds (solubility) | 1mg/L or less (*3) | 1mg/L or less |
| Chromium and its compounds | 2mg/L or less (*3) | 2mg/L or less |
| Hydrogen ion concentration (pH) | More than 5 and less than 9 (*3) | More than 5 and less than 9 |
| Biochemical Oxygen Demand (BOD) | Less than 600mg/L (*6) | Less than 600mg/L (*6) |
| Suspended matter mass (SS) | Less than 600mg/L (*6) | Less than 600mg/L (*6) |
| Normal hexane extract substance content (mine oil content) | 5mg/L or less (*3) | 5mg/L or less |
| Normal hexane extract content (contents of flora and fauna oils) | 30mg/L or less (*6) | 30mg/L or less (*6) |
| Nitrogen content | Less than 120 mg/L (*7) | Less than 120 mg/L (*7) |
| Phosphorus content | Less than 16mg/L (*7) | Less than 16mg/L (*7) |
| Dioxins | 10pg-TEQ/L or less (*8) | 10pg-TEQ/L or less (*8) |
| Nickel and its compounds | --- | 1mg/L or less |
| Appearance | --- | There must be no color or turbidity that significantly changes the accepted sewage or color that increases turbidity. |
| Temperature | --- | Less than 45 degrees |
| Amount of fertile consumption | --- | Less than 220 mg/L (*3) |
(Remarks)
*1
As a transitional measure, provisional standards based on the Water Pollution Control Law have been set for some industries for a certain period of time.
*2
The water quality standards in [] apply to business sites that are excluded to water reclamation centers (Note 1) where the water is discharged from the sea area.
(Note 1) Water Reclamation Centers where the waters are discharged: Northern second, central and southern regions
*3
Applicable to business sites with an average amount of effluent of 50m3 or more per day.
*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 new water reclamation center (Note 3) (Kanagawa Prefecture Ordinance (Note 4) Applies to specific business establishments other than "new establishment" specified in 1 (1) Remarks 4 of 3). However, regarding the water quality standards for zinc and its compounds, the existing specified business sites to which the provisional standards apply are "3 mg / L" (until December 10, 2024).
(Note 2) Existing Water Reclamation Center: Central, Southern, Northern First, Sakae Second, Kohoku
(Note 3) New Water Reclamation Center: Tsuzuki, Kanagawa, Kanazawa, Western, Northern Second, Sakae Daiichi
(Note 4) Kanagawa Prefecture Ordinance: Ordinances that stipulate emission standards pursuant to the provisions of Article 4, Paragraph 1 of the Air Pollution Control Law and drainage standards pursuant to Article 3, Paragraph 3 of the Water Pollution Control Law
*5
Water quality standards in this <> shall be applied to business sites that are excluded to existing water reclamation centers (Note 2).
*6
Apply to business establishments with an average daily discharge of 2,000 m3 or more.
*7
Applies to the water reclamation center (Note 5) where the average amount of effluent per day is 50 m3 or more and Tokyo Bay and public water bodies flowing into it (hereinafter referred to as the “Tokyo Bay Basin”) are discharged.
(Note 5) Water Reclamation Center with the Tokyo Bay Basin as its discharge destination: Northern 1st, Northern 2nd, Kanagawa, Chubu, Southern, 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 standard: 10pg-TEQ/L |
| Other business sites | Standards for setting up 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 or sewage containing wastewater from facilities subject to water quality standards or sewage discharged from facilities where air standard application facilities (*c) are installed (hereinafter referred to as “Dioxin drainage standards apply”) Applicable only when excluding to the water reclamation center).
[Water Reclamation Center to which dioxin wastewater standards apply]
Northern second, Kanagawa, Kohoku, Tsuzuki, Kanazawa, Southern
*c
Facilities listed in Appendix 1 of the Enforcement Ordinance on Special Measures against Dioxins, which are limited to those installed on or after April 1, 2003.
Inquiries to this page
Sewer River Bureau Sewerage Facilities Department Water Quality Section Factory Drainage
Telephone: 045-671-2835
Telephone: 045-671-2835
Fax: 045-550-4183
Email address: gk-kouhai@city.yokohama.lg.jp
Page ID: 419-339-161
