Q2-3 Consultation on Water Pollution

When washing water containing paint (paint) or concrete (mortar) is washed away, even a small amount of water is covered and becomes cloudy. Yokohama City conducts on-site surveys to determine the presence of hazards such as harms, and arranges the collection of contaminants as necessary. In addition, we perform identification of cause person and guidance such as appropriate drainage method.
Penalties may be subject to penalties under laws and regulations or claim restoration costs.

＊Flyer Please dispose of paint and oil waste liquids so as not to pollute the river and the sea (PDF: 781KB)
Road gutters immediately drain rainwater on the road to the rainwater pipe. If paint is poured into road gutters, river pollution will adversely affect creatures such as fish and the river environment due to river pollution. For this reason, do not flush the paint on the road gutter.

In addition, the river may turn brown as a natural phenomenon. Kind water, commonly found on river seawalls, is caused by the iron contained in the soil melts out and is oxidized by bacteria. Also, the sea and rivers may turn reddish due to the red tide.

(River manager: Public Works Office each ward, Yokohama Kawasaki flood control office (outside site), Keihin River Office (outside site))
(Water and Soil Environment Division, Phone number: 045-671-4244)

When waste oil or fuel oil is washed away, even a small amount of water is covered and becomes an oil film. Yokohama City conducts on-site surveys to determine if there is any danger such as ignition, and arrange oil recovery work as necessary. In addition, we perform identification of cause person and guidance such as appropriate drainage method.
Penalties may be subject to penalties under laws and regulations or claim restoration costs.

＊Flyer Please dispose of paint and oil waste liquids so as not to pollute the river and the sea (PDF: 781KB)
Road gutters immediately drain rainwater on the road to the rainwater pipe. Flushing oil into road gutters can adversely affect creatures such as fish and the river environment due to river pollution. For this reason, do not allow oil to flow into road gutters.

(In case of emergency such as flammable oils and fats, police: 110, fire department: 119, Japan Coast Guard: 118)
(River manager: Public Works Office each ward, Yokohama Kawasaki flood control office (outside site), Keihin River Office (outside site))
(Port manager: Port and Harbor Bureau)
(Water and Soil Environment Division, Phone number: 045-671-4244)

In order to investigate the cause of the death of the fish, Yokohama City will conduct water quality tests and fish inspections according to the situation. If harmful substances are detected, we will investigate the cause and investigate the impact on the surrounding area, and take necessary measures in cooperation with related organizations.
Dischargeers of harmful substances, etc. may be subject to penalties under laws and regulations or require restoration costs.

Regarding carp death, carp herpes has also been confirmed to cause death. In this case, measures such as prohibiting the movement of fish to prevent infection in other waters.
About carp herpes, please see information (outside site) about carp herpes virus disease of Ministry of Agriculture, Forestry and Fisheries.

(In case of emergency, police: 110, fire department: 119, Japan Coast Guard: 118)
(River manager: Public Works Office each ward, Yokohama Kawasaki flood control office (outside site), Keihin River Office (outside site))
(Port manager: Port and Harbor Bureau)
(Water and Soil Environment Division, Phone number: 045-671-4244)

Please see the list of water quality accidents that occurred in the city.

As of July 27, 2023, the pond of Tomioka General Park and the area of Minamidai River were designated as a range of carp removal prohibited waters based on the instructions of the Kanagawa Prefectural Water Surface Fisheries Management Committee.
For more information, please refer to the following web page.

About carp herpes virus (KHV) disease (Kanagawa Prefecture) (outside site)
About range of water system to affect carp removal prohibition (Kanagawa) (outside site)