| Office | Zipcord | Address | Phone |
|---|---|---|---|
| Japan Water Agency, Head Office | 330-6008 | 11-2 Shintoshin, Chuo-ku, Saitama City, Saitama-pref | +81-48-600-6553 |
| Enginerring Center | 330-6008 | 11-2 Shintoshin, Chuo-ku, Saitama City, Saitama-pref | +81-48-600-6553 |
| Tone Water Transfer Canal System Reconstruction and Management Office | 361-0004 | 4369 Suka,Gyoda City,Saitama-pref | +81-48-557-1501 |
| Omoi River Development Project Office | 322-0305 | 839-2 Kuchiawano,Kanuma City,Tochigi-pref | +81-289-85-1110 |
| Numata Dam Control and Management Office | 378-0051 | 1682 Kamihara-Machi,Numata City,Gunma-pref | +81-278-24-5711 |
| Tone River Downstream Areal Management Office | 300-0732 | 3112 Kaminoshima,Inashiki City,Ibaraki-pref | +81-299-79-3311 |
| Ara River Dam Control and Management Office | 369-1801 | 4041 Arakawa-kuna,Chichibu City,Saitama-pref | +81-494-23-1431 |
| Chiba Regional Water Control and Management Office | 276-0028 | 3139 Murakami,Yachiyo City,Chiba-pref | +81-47-483-0722 |
| Shimokubo Dam Management Office | 367-0313 | 1356-3 Yanou,Kamikawa Town,Saitama-pref | +81-274-52-2746 |
| Kusaki Dam Management Office | 376-0303 | 564-6 Azumacho-zama,Midori City,Gunma-pref | +81-277-97-2131 |
| Gumma Canal System Management Office | 371-0844 | 386 Fruichi-Cho,Maebashi City,Gunma-pref | +81-27-251-4266 |
| Kasumigaura Canal System Management Office | 300-0213 | 359 Ushiwata,Kasumigaura City,Ibaraki-pref | +81-29-898-2212 |
| Chubu Regional Head Office | 460-0001 | 1-2-1 Sannomaru,Naka Ward,Nagoya City,Aichi-pref | +81-52-231-7541 |
| Toyogawa Canal System Reconstruction and Management Department | 440-0801 | 8 Imabashi-Cho,Toyohashi City,Aichi-pref | +81-532-54-6501 |
| Kiso River System Aqueduct Construction Office | 500-8367 | 4-18-10 Usa-Minami,Gifu City,Gifu-pref | +81-58-278-2161 |
| Aichi Canal System Control and Management Office | 470-0151 | 25-25 Morowa,Togo Town,Aichi-pref | +81-561-39-5460 |
| Kisogawa Canal System Control and Management Office | 495-0036 | 26-1 Sobuecho-Makai,Inazawa City,Aichi-pref | +81-587-97-3710 |
| Iwaya Dam Management Office | 509-1602 | 6-27 Kanayamacho-Unohara,Gero City,Gifu-pref | +81-576-35-2339 |
| Agigawa Dam Management Office | 509-7202 | 2271-79 Higashino,Ena City,Gifu-pref | +81-573-25-5295 |
| Nagaragawa Estuary Barrage Management Office | 511-1146 | 136 Nagashimacho-Toukadomo,Kuwana City,Mie-pref | +81-594-42-5012 |
| Misogawa Dam Management Office | 399-6203 | 2058-22 Ogiso,Kiso Village,Nagano-pref | +81-264-36-3111 |
| Tokuyama Dam Management Office | 501-0815 | 448 Kaiden,Ibigawa Town,Gifu-pref | +81-585-52-2910 |
| Mie Canal System Management Office | 510-1233 | 7961-2 Komono,Komono Town,Mie-Pref | +81-593-93-2000 |
| Kansai Regional Head Office | 540-0005 | Uemachi-Seiwa Building,A-12 Uemachi,Chuo Ward,Osaka City,Osaka-pref | +81-6-6763-5182 |
| Kawakami Dam Construction Office | 518-0294 | 251 Ao,Iga City,Mie-pref | +81-595-52-1661 |
| Niu Dam Construction Office | 529-0522 | 819 Yogocho-Sakaguchi,Nagahama City,Shiga-pref | +81-749-86-3800 |
| Lake Biwa Management Office | 520-0243 | 2-1-10 Katata,Otsu City,Shiga-pref | +81-77-574-0680 |
| Kizu Integrated Dam Control and Management Office | 518-0413 | 2811-2 Shimohinachi,Nabari City,Mie-Pref | +81-595-64-8961 |
| Hitokura Dam Management Office | 666-0153 | 4-1 Hitokura,Kawanishi City,Hyogo-pref | +81-72-794-6671 |
| Hiyoshi Dam Management Office | 629-0335 | 68 Hiyoshicho-Naka,Nantan City,Kyoto-pref | +81-771-72-0171 |
| Shikoku Regional Head Office | 760-0018 | 10-1 Tenjinmae,Takamatsu City,Kagawa-pref | +81-87-835-6600 |
| Ikeda Dam Control and Management Office | 778-0040 | 4235-1 Ikedacho-Nishiyama,Miyoshi Town,Tokushima-pref | +81-883-72-2050 |
| Kyu-Yoshinogawa Estuary Barrages Management Office | 771-0144 | 841 Kawauchicho-Enase,Tokushima City,Tokushima-pref | +81-88-665-1435 |
| Kagawa Canal System Management Office | 766-0004 | 891-2 Enai,Kotohira Town,Kagawa-pref | +81-877-73-4221 |
| Kyusyu Regional Head Office | 830-0032 | 42-21 Higashi-Machi,Kurume City,Fukuoka-pref | +81-942-34-7001 |
| Koishiwaragawa Dam Construction Office | 838-0019 | 1373-1 Kamiakizuki,Asakura City,Fukuoka-pref | +81-946-25-1100 |
| Terauchi Dam Management Office | 838-0029 | 1516-6 Inaibaru,Asakura City,Fukuoka-pref | +81-946-22-6713 |
| Ryochiku-heiya Canal Sytem Reconstruction and Management Office | 838-0012 | 1660-67 Egawa,Asakura City,Fukuoka-Pref | +81-946-25-0113 |
| Oyama Dam Construction Office | 877-0201 | 482-1 Oyamamachi-Nishioyama,Hita City,Oita-pref | +81-973-52-3300 |
| Chikugo River Areal Management Office | 830-0071 | 23-1 Yasutakemachi-Takeshima,Kurume City,Fukuoka-pref | +81-942-26-3484 |
| Chikugo Barrage Management Office | 830-0071 | 1063-2 Yasutakemachi-Takeshima,Kurume City,Fukuoka-pref | +81-942-26-4551 |