Enterprises or sewage systems that may dilute wastewater or sewage under permission shall mix and dilute such wastewater or sewage using the blending facilities in the wastewater or sewage treatment/pre-treatment facilities.
Independent and exclusive cumulative inflow water measurement facilities shall be set up for the blending facilities referred to in the preceding paragraph.
In case dilution is made to rescue personnel or salvage major treatment facilities recognized by the competent authority in an emergency specified in Paragraph 3, Article 18-1 of the Act, the start and end times of the dilution, the reason for the dilution, the volume of water, and the reporting time shall be recorded, and a written report on the measures taken during the dilution shall be submitted to the municipality or county (city) competent authority and the Issuing Authority within 20 days.
The written report referred to in the preceding paragraph shall contain the following information:
I. The reason for and time of the dilution.
II. The receiving party of the report and the reporting method and time.
III. Measures taken during the dilution.
IV. Personnel involved in the measures and their tasks.
V. The water monitoring result as a measure to the dilution.
VI. Sequential measures and improvements.
VII. Others.

Enterprises or sewage systems that remove or transport wastewater or sewage to a place outside the work environment using barrels, tank trucks or other non-pipe means or ditches shall set up storage facilities in the work environment to store the wastewater or sewage that has not been removed or transported.
Storage facilities for collection of landfill leachate, water pumping facilities, and intercepting ditches for runoff wastewater shall be set up in case of landfill leachate recirculation to its surface.

For the enterprises or sewage systems taking storage measures, independent and exclusive cumulative inflow and outflow water measurement facilities or measurement facilities with automatic fluid level recording and storage volume displaying functions shall be set up for the storage facilities.
Enterprises and sewage systems shall, by day and by batch, record the wastewater or sewage storage time, transport (delivery) method, water volume and treated water volume, and shall retain the record as a reference for three years.
Storage facilities used for the emergency response pursuant to Paragraph 1, Article 18 or Paragraph 1, Article 31 shall be subject to the preceding two paragraphs.
Where stored wastewater or sewage does not meet the effluent standard and is to be removed to a place outside the work environment using barrels, tank trucks or other non-pipe means or ditches, production of wastewater or sewage shall stop when the wastewater or sewage is stored in the work environment for more than 30 days and approval of other pollution control measures is not acquired from the Issuing Authority.

Enterprises and sewage systems shall have storage facilities with a capacity that can meet the requirements of emergency response.