| Facility | Location | Reviewing Organization |
|---|---|---|
| Head office | Saitama City, Saitama | DNV GL |
| Maebashi Factory | Maebashi City, Gunma | |
| Maebashi Factory, Ota Plant | Ota City, Gunma | |
| Koriyama Factory | Koriyama City, Fukushima | |
| Model Development Center Karasuyama | Karasuyama City, Tochigi | |
| Kameyama Factory | Kameyama City, Mie | |
| Kameyama Factory, Nakatsu Plant |
Nakatsu City, Oita | |
| Kameyama Factory, Konan Plant |
Konan City, Shiga | |
| Development & Engineering Center | Koriyama City, Fukushima |
H-ONE has acquired international certification for quality assurance, ISO9001 as an important policy to enhance our corporate constitution.
