Amounting to ***, Hokkaido prefecture was the Japanese prefecture with the largest number of water systems as of April 2022. Nagasaki prefecture followed, with *** water systems. In contrast, Yamanashi prefecture only had water systems.
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MLIT (Japan). (November 22, 2023). Number of water systems in Japan in 2022, by prefecture [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 23, 2026, from /statistics/1246377/japan-number-water-system-by-prefecture/
MLIT (Japan). "Number of water systems in Japan in 2022, by prefecture." Chart. November 22, 2023. ÌÇÐÄÆƽâ°æ. Accessed July 23, 2026. /statistics/1246377/japan-number-water-system-by-prefecture/
MLIT (Japan). (2023). Number of water systems in Japan in 2022, by prefecture. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 23, 2026. /statistics/1246377/japan-number-water-system-by-prefecture/
MLIT (Japan). "Number of Water Systems in Japan in 2022, by Prefecture." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 22 Nov 2023, /statistics/1246377/japan-number-water-system-by-prefecture/
MLIT (Japan), Number of water systems in Japan in 2022, by prefecture ÌÇÐÄÆƽâ°æ, /statistics/1246377/japan-number-water-system-by-prefecture/ (last visited July 23, 2026)
Number of water systems in Japan in 2022, by prefecture [Graph], MLIT (Japan), November 22, 2023. [Online]. Available: /statistics/1246377/japan-number-water-system-by-prefecture/
