Reference
·Primary source
Thailand wastewater treatment coverage
~34% safely treated
Approximately 34% of Thailand's domestic wastewater is safely treated as of 2024, per UN SDG 6.3.1 data and the Thai-German cooperation DSPOT programme. The country operates roughly 100 central domestic wastewater treatment systems with combined capacity of about 2.7 million m3/day, equating to roughly 27% of total domestic wastewater generated. The gap to safe-treatment coverage is bridged partially by on-site septic systems and decentralised treatment, but uncollected/untreated discharge remains a material surface-water pollution driver — particularly in Bangkok canals and the Chao Phraya estuary.
Figure in context
Approximately 34% of Thailand's domestic wastewater is safely treated as of 2024, per UN SDG 6.3.1 data and the Thai-German cooperation DSPOT programme. The country operates roughly 100 central domestic wastewater treatment systems with combined capacity of about 2.7 million m3/day, equating to roughly 27% of total domestic wastewater generated. The gap to safe-treatment coverage is bridged partially by on-site septic systems and decentralised treatment, but uncollected/untreated discharge remains a material surface-water pollution driver — particularly in Bangkok canals and the Chao Phraya estuary.
Approximately 34% of Thailand's domestic wastewater is safely treated as of 2024, per UN SDG 6.3.1 data and the Thai-German cooperation DSPOT programme. The country operates roughly 100 central domestic wastewater treatment systems with combined capacity of about 2.7 million m3/day, equating to roughly 27% of total domestic wastewater generated. The gap to safe-treatment coverage is bridged partially by on-site septic systems and decentralised treatment, but uncollected/untreated discharge remains a material surface-water pollution driver — particularly in Bangkok canals and the Chao Phraya estuary.
Time scope
FY2024
Source basis
Primary source
Interpretation notes
What this tells you
Approximately 34% of Thailand's domestic wastewater is safely treated as of 2024, per UN SDG 6.3.1 data and the Thai-German cooperation DSPOT programme. The country operates roughly 100 central domestic wastewater treatment systems with combined capacity of about 2.7 million m3/day, equating to roughly 27% of total domestic wastewater generated. The gap to safe-treatment coverage is bridged partially by on-site septic systems and decentralised treatment, but uncollected/untreated discharge remains a material surface-water pollution driver — particularly in Bangkok canals and the Chao Phraya estuary.
What not to do with it
34% is the SDG 6.3.1 'safely treated' benchmark. 27% is centralised plant capacity coverage; the gap reflects on-site septic and decentralised systems with variable performance.
Related figures
Adjacent numbers that add context without drowning the value.
Thailand water utilities sector revenue (2020-2024)
Metropolitan Waterworks Authority, Provincial Waterworks Authority, TTW SET filings, Eastern Water Resources Development and Management, WHA Utilities and Power
TTW and Eastern Water (EASTW) revenue (2020-2024)
TTW SET annual reports, Eastern Water Resources Development and Management, CH. Karnchang infrastructure investment disclosures, TTW Listed Company Snapshot YE2024
Thailand water demand: municipal vs industrial split
Thailand Board of Investment, Hydro-Informatics Institute, Metropolitan Waterworks Authority, Provincial Waterworks Authority, EASTW investor presentations
Chao Phraya basin reservoir storage (2020-2024)
Royal Irrigation Department, Hydro-Informatics Institute, ADB SEADS basin report, ReliefWeb RID Chao Phraya drought response
MWA Bangkok daily water delivery
Metropolitan Waterworks Authority, MWA operational disclosures, World Benchmarking Alliance Urban benchmarks, Wikipedia compiled MWA statistics
PWA provincial water network coverage
Provincial Waterworks Authority, PWA Annual Report, Bangkok Post PWA 2024 drought relief launch, TTW concession disclosures
Report context
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