2025-2027
PWA
Chiang Rai Project
Water supply improvement and expansion, PWA Mae Sai–(Huai Takhrai)–(Mae Chan)–(Chiang Saen) branches, Chiang Rai
฿976M
Project value
24,000 m³/day
Treatment capacity
62 km
Pipe transmission
630 mm
Largest pipe
the challenge
Meet demand in the existing service area and the Chiang Rai Special Economic Development Zone by expanding production and distribution across Mae Sai, Mae Chan and Chiang Saen.
what we delivered
Scope covers a Mekong raw-water intake, Chiang Saen 2 treatment plant, Pa Sak, Chan Chwa and Pong Ngam distribution stations, Mae Chan service unit, 62 km of mains, and automation systems.
how it was built
Pipe by HDD, pipe jacking and open-cut over 62 km — including steel 600 mm (19.7 km), multiple HDPE sizes, HDD 400–630 mm, and 0.50 km of pontoon-weighted HDPE 630 mm.
Impact
Addresses household water shortages across Mae Sai, Mae Chan and Chiang Saen, with supply planned for the next 10 years.
