According to the AI summary below, and maybe not surprisingly, it would be a long, costly and massive undertaking...

I wonder how many mega cities in Asia have sanitary sewage systems? Just maybe Singapore and those in Japan/Korea?

 

Replacing all septic systems in Bangkok with a sanitary sewage system would be a massive, multi-decade project, not a simple residential replacement. The process involves a combination of city-wide infrastructure expansion, individual household connections, and significant investment. Therefore, there is no single timeline, but the overall project is a long-term urban development goal with a timeline that depends on funding, engineering, and execution, and is likely to take many decades to complete. 

 

Factors that make this a long-term project

 

• Scale: 

  Bangkok is a megacity, and replacing every individual septic system with a connection to a centralized sewer is an undertaking of city-wide proportions.
• Existing infrastructure: 

  Much of the city's infrastructure is not designed to support a city-wide sewer system, meaning new pipes, treatment plants, and connections must be built from the ground up.
• Urban complexity: 

  Bangkok's dense and complex urban environment presents significant engineering challenges for laying new pipes and connecting all buildings.
• Cost: 

  The financial investment required for this type of large-scale public works project is enormous and would be spread out over many years.
• Ongoing maintenance: 

  Once a centralized system is in place, the city will also have the ongoing cost of maintaining and upgrading the infrastructure, including treatment plants and a network of pipes. 

   

Therefore, the replacement is a multi-decade, ongoing urban development goal, rather than a project with a fixed timeline.

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