Fukuoka City ― Practical Application of the Secondary Water System Mid-1990s The practical application of the secondary water system in Fukuoka City during the mid-1990s symbolized the era when Japanese cities were confronted with water resource constraints as a real problem. In 1994, northern Kyushu suffered a record drought, leading to prolonged water supply restrictions. As water outages and reduced pressure became commonplace in many cities, the inherent vulnerability of water-intensive urban life was laid bare. This experience fundamentally challenged the long-held assumption of a constant, abundant water supply.

Fukuoka City ― Practical Application of the Secondary Water System Mid-1990s The practical application of the secondary water system in Fukuoka City during the mid-1990s symbolized the era when Japanese cities were confronted with water resource constraints as a real problem. In 1994, northern Kyushu suffered a record drought, leading to prolonged water supply restrictions. As water outages and reduced pressure became commonplace in many cities, the inherent vulnerability of water-intensive urban life was laid bare. This experience fundamentally challenged the long-held assumption of a constant, abundant water supply.

Amid this crisis, the reclaimed water system introduced by Fukuoka City drew significant attention. Reclaimed water involves highly purifying treated sewage water for reuse in non-potable applications. In Fukuoka, this reclaimed water was supplied primarily to apartment buildings and large-scale commercial buildings for toilet flushing and irrigation. It is emphasized that even during the drought, toilets in these buildings functioned normally, significantly mitigating disruption to daily life.

A crucial historical context was Japan's water administration shifting focus from securing quantity to transforming usage. Since the high-growth era, increased demand had been met through dam construction and water source development. However, by the 1990s, securing new water sources began showing limitations in terms of environmental impact and cost.

Amid this context, the secondary water system embodied a paradigm shift: instead of seeking new water, it focused on circulating water already used. The concept of redefining sewage not merely as waste but as a reusable resource within the city also represented an attempt to link environmental technology with urban planning.

Fukuoka City's recycled water system was a pioneering mid-1990s initiative that redesigned urban infrastructure with water resource constraints as a fundamental premise. Its effectiveness became visible through the emergency of drought, positioning recycled water as a practical infrastructure that enhances urban resilience.