Water Pollution Control Law: A law enacted in 1970 to prevent water pollution by regulating the discharge of polluted water into public water bodies and groundwater.

Water Pollution Control Law: A law enacted in 1970 to prevent water pollution by regulating the discharge of polluted water into public water bodies and groundwater.
Public water bodies: refers to water bodies used for public purposes such as rivers, lakes, marshes, harbors, irrigation canals, and public waterways.
Groundwater remediation measures: Measures to prevent and remedy groundwater contamination, which were strengthened by the Basic Plan for Water Environment.
Effluent standards: Standards that specify the permissible limits of hazardous substances contained in discharged water; there are uniform standards and additional standards.
Hazardous substances: Substances that may adversely affect human health or the environment, as defined in the Water Pollution Control Law.
Living environment items: Items of substances that affect the human living environment, such as pH in wastewater.
Boron and its compounds: Newly regulated substances, mainly contained in industrial wastewater.
Fluorine and its compounds: Newly regulated substances, used in the electronics industry, etc.
Ammonia and ammonium compounds: Newly regulated substances, contained in fertilizers and industrial wastewater.
Nitrous acid and its compounds: Newly regulated substances, contained in food processing and industrial wastewater.
Additional standards: Effluent standards that are stricter than the uniform standards and are set independently by prefectural governments.
Biochemical Oxygen Demand (BOD): An indicator to evaluate water quality by measuring the amount of oxygen consumed by microorganisms during the decomposition of organic matter in water.
Suspended solids (SS): Minute solid substances suspended in water, an indicator of water pollution.
Horizontal displacement standard: A regulatory standard by prefectural ordinance that applies to workplaces without specific facilities.
Designated water areas: Areas where particularly strict effluent standards are set for specific water areas. Includes Tokyo Bay, Ise Bay, and the Seto Inland Sea.
Cadmium and its compounds: Heavy metals and toxic substances that are regulated particularly strictly by standards for groundwater seepage water.
Cyanide compounds: toxic compounds, strictly regulated by groundwater seepage water standards.
Specific facility: A business site or facility that discharges wastewater, as defined in the Water Pollution Control Law.
Effluent volume: The amount of water discharged from a business site, which serves as the basis for determining the scope of application of regulations.
Water Quality Environmental Standards: Standards set under the Water Pollution Control Law to maintain and improve water quality.