The MEA offices in Thonburi, Bangkhuntian, Samsen, Yannawa, and Bangkhen won the honour.
Somboon Somdulkanok, MEA deputy director-general, received the honorary plaques from the representative of the Pollution Control Department at the Ministry of Natural Resources.
The MEA said it remained committed to providing quality service to customers in metropolitan areas while promoting environment conservation and sustainable management of water resources.