Septic Tank Day

What Is Septic Tank Day?

October 1st is "Septic Tank Day" (Johkaso no Hi) in Japan, commemorating the full enforcement of the Johkaso Act on this day in 1985. It was established in 1987 by Japan's then Ministry of Health and Welfare, Environment Agency, and Ministry of Construction.

An Unseen Piece of Infrastructure That Protects Water Quality

A johkaso (septic tank system) is essential equipment for purifying household wastewater in areas without sewer systems.

• Origin: the date commemorates the full enforcement of the Johkaso Act on October 1, 1985
• Purpose: to raise wide awareness of the importance of properly maintaining septic tank systems
• Its role: purifies household wastewater and helps protect the water quality of rivers and oceans

Why Regular Maintenance and Inspection Matter

Simply installing a septic tank system isn't enough -- without regular cleaning and legally required inspections, it can't perform its intended purification function. Proper maintenance is the key to protecting water quality.

Tips for Marking This Day

• If your home has a septic tank system, check on its maintenance status
• Learn about how septic tank systems work and what role they play
• Think about what you personally can do to help protect water quality
• Take an interest in local infrastructure like sewers and septic systems

Quietly Protecting Water and Daily Life, Out of Sight

Septic tank systems, rarely thought about day to day, quietly support the water quality of local communities. October 1st is a day to give thanks to this unassuming piece of infrastructure.