Japan. Kankyōshō. Mizu Kankyōka

• Heisei 19-nendo suishitsu odaku busshitsu haishutsuryō sōgō chōsa
• Heisei 20-nendo suishitsu kankyō kijun seikatsu kankyō kōmoku (shinki kōmoku) kentō chōsa gyōmu hōkokusho
• Heisei 21-nendo suishitsu kankyō kijun seikatsu kankyō kōmoku (shinki kōmoku settei tō) kentō chōsa gyōmu hōkokusho