Construction drainage (drainage to public sewers)

Notification may be required to drain the drainage generated during construction to sewer pipes (public sewers).
In particular, a notification is required when alkaline wastewater generated by concrete casting work, etc., is drained into sewer pipes (public sewers).

• When draining construction wastewater with a maximum of 50 m3 or more per day
• Drainage of construction wastewater exceeding pH 9 (alkaline) (Water quality standard: 5 and less than 9)

If the above applies, a notification is required.

When we install abatement facilities (water treatment facilities) such as neutralization treatment facilities newly, report is necessary.

If you do not know the necessary report, please contact the Sewerage River Bureau Water Quality Division Factory Drainage Section.

When draining construction drainage to public sewer temporarily, presentation of "public sewer temporary use permission application" is necessary to each ward Public Works Office. For more information, please visit Public Works Office.