Small-Scale Water Supply Project in Suzu City, Ishikawa (2024)
This article introduces a case study of a small-scale water supply system installed in Suzu City, Ishikawa Prefecture, in 2024.
Small-scale water supply facility in Suzu City, Ishikawa
Project Overview
📍 Location: Suzu City, Ishikawa Prefecture
📅 Installation Date: June 2024
💧 Water Supply Start: July 2024
System Outline
🏗️ Water Treatment: Upflow gravel filtration + biological filtration
👥 Target Population: 15 residents
Background
The Noto Peninsula earthquake in January 2024 caused catastrophic damage to water infrastructure in Suzu City.
The target area was particularly delayed in recovery efforts, with no timeline for restoration while other regions progressed.
Amid this crisis, our director, who was involved in local relief efforts, learned from residents of a perennial mountain spring.
The source typically delivered clean water but occasionally became turbid during rainfall.
At the request of local residents, we proposed and secured approval to install a small-scale supply system using this natural source, providing essential water until the municipal system could be restored.
Key Features
The system uses mountain stream water and operates with a non-powered, chemical-free filtration process.
Water is delivered by gravity to coastal residential areas, eliminating the need for pumps or electricity.
By focusing solely on non-potable household water, the system achieves low cost and long-term sustainability.
Water Supply During the Noto Heavy Rainfall
In late September 2024, torrential rains affected the region. Although our facility was briefly impacted, water supply resumed the next day after simple maintenance.
Meanwhile, municipal water service was suspended for over a month in the area due to flood damage.
During this period, our system became a vital source of household water, supporting the local community’s daily life.
Looking Ahead
This project highlights the effectiveness of non-electric, chemical-free water systems in disaster-prone or resource-limited areas.
At the Water Future Research Institute, we continue to promote sustainable, small-scale water infrastructure nationwide, adapting to the unique water challenges of each region.
If you’re interested in this system or considering implementation in your area, feel free to contact us.