Metropolitan Waterworks Authority
Metropolitan Waterworks Authority (MWA) is the Thai state-owned water utility serving Bangkok metropolitan area, Nonthaburi, and Samut Prakan provinces. Approximately 2.5 million household water-supply connections. Sources raw water from the Chao Phraya River system and treats at multiple production facilities. Reports to Ministry of Interior. Co-exists with Provincial Waterworks Authority (PWA) which serves the rest of Thailand. Frames Thai urban water-supply economics alongside East Water (SET:EASTW) and TTW (SET:TTW) private-water-treatment operators.
Profile overview
Metropolitan Waterworks Authority (MWA) is the Thai state-owned water utility serving Bangkok metropolitan area, Nonthaburi, and Samut Prakan provinces. Approximately 2.5 million household water-supply connections. Sources raw water from the Chao Phraya River system and treats at multiple production facilities. Reports to Ministry of Interior. Co-exists with Provincial Waterworks Authority (PWA) which serves the rest of Thailand. Frames Thai urban water-supply economics alongside East Water (SET:EASTW) and TTW (SET:TTW) private-water-treatment operators.
Operations and programmes
Water production
Chao Phraya source system
MWA draws raw water primarily from the Chao Phraya River via the Samlae and Bangkhen water-treatment plants, producing approximately 6 million cubic metres per day of treated water. Bangkok's water quality meets WHO drinking-water standards following treatment.
Distribution network
~2.5M household connections
MWA's distribution network covers approximately 4,000 km of water mains across Bangkok, Nonthaburi, and Samut Prakan. Non-revenue water (NRW) rate is approximately 20-25%, targeted to reduce below 20% under the 2022-2026 infrastructure-upgrade programme.
Tariff structure
Progressive residential rates
MWA uses a progressive water-tariff structure: residential rates start at $0.246per cubic metre for the first 30 cubic metres and rise to $0.304for higher consumption tiers. Commercial and industrial rates are higher. Tariff revisions require Cabinet approval.
Thai water utility comparison
MWA
Service area
Bangkok, Nonthaburi, Samut Prakan
Connections (M)
~2.5
Ownership
State-owned (Ministry of Interior)
PWA
Service area
All other provinces
Connections (M)
~5.0
Ownership
State-owned (Ministry of Interior)
| Entity | Service area | Connections (M) | Ownership |
|---|---|---|---|
| MWA | Bangkok, Nonthaburi, Samut Prakan | ~2.5 | State-owned (Ministry of Interior) |
| PWA | All other provinces | ~5.0 | State-owned (Ministry of Interior) |
| East Water (EASTW) | Eastern Seaboard industries | B2B industrial | SET-listed (SET:EASTW) |
| TTW | Nakhon Pathom, Samut Sakhon | ~0.5M households (est.) | SET-listed (SET:TTW) |
Watchpoints 2025-2026
Drought resilience
Chao Phraya low-flow risk
Prolonged dry seasons reduce Chao Phraya raw-water availability, forcing MWA to draw from reserve reservoirs. Climate-change modelling suggests increased drought frequency; MWA is investing in alternative raw-water intake points and groundwater backup capacity.
NRW reduction
Pipe replacement programme
MWA's non-revenue water rate of 20-25% represents approximately 1-1.5 million cubic metres of daily water loss. The 2022-2026 $579.7M pipe-replacement programme targets NRW below 20%, improving both water security and MWA operational efficiency.
Tariff revision
Cost recovery gap
MWA's regulated tariffs have not been revised since 2017. Rising energy costs (water pumping) and capital expenditure requirements create a cost-recovery gap. A Cabinet-approved tariff revision in 2025-2026 is expected to raise residential rates by $0.029-2 per cubic metre.
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Peers, parents, partners, agencies, and other Water Utility actors.
Competitor
BEM Water
Listed BEM group's ancillary water-supply concession; transport-conglomerate with water diversification.
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Competitor
East Water (EASTW)
Listed EEC, Eastern Seaboard raw water supplier; serves industrial estates, municipalities; direct EEC demand leverage.
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Competitor
Provincial Waterworks Authority (PWA)
State provincial Thai municipal water operator; ~4M connections nationwide; contracts private concessionaires for certain districts.
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Reports featuring this profile
Thailand Water Utilities Supply & Treatment Market Intelligence
State enterprise serving Bangkok, Nonthaburi, Samut Prakan; four major treatment plants
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Sits alongside 6 other Atlas profilesThai Water Utility: MWA, PWA, EAST WATER, and the Bangkok Water Distribution Backbone
Thai state-owned water utility for Bangkok metropolitan area; ~2.5M household connections.
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Sits alongside 5 other Atlas profilesRelated Market profiles
competitor
BEM Water
Listed BEM group's ancillary water-supply concession; transport-conglomerate with water diversification.
competitor
East Water (EASTW)
Listed EEC, Eastern Seaboard raw water supplier; serves industrial estates, municipalities; direct EEC demand leverage.
competitor
Provincial Waterworks Authority (PWA)
State provincial Thai municipal water operator; ~4M connections nationwide; contracts private concessionaires for certain districts.