MWA Bangkok waterworks
Metropolitan Waterworks Authority (MWA) is Thailand's state enterprise delivering Bangkok, Nonthaburi, Samut Prakan municipal water. Founded 1967. ~2M connections. Tariff-regulated. Responsible for ~30% of Thai water sector revenue. Not investable directly but critical infrastructure operator.
Snapshot
Headline numbers a buyer checks first.
Coverage
Bangkok, Nonthaburi, Samut Prakan
Ongoing
Connections
~2M
FY2024
Founded
1967
Historical
What this institution actually does
MWA delivers Bangkok, Nonthaburi, Samut Prakan municipal water to ~2M connections. State enterprise under Ministry of Interior. Tariff-regulated; focuses on coverage, treatment quality, non-revenue water reduction.[]
Competitive set: PWA (provincial peer); private concessionaires (TTW) supply specific districts. MWA differentiates on Bangkok coverage, scale.[, ]
Operations and service segments
Municipal water supply
Bangkok and peri-Bangkok coverage
MWA supplies treated municipal water to approximately 2 million connections in Bangkok, Nonthaburi, and Samut Prakan. The coverage area encompasses the core Bangkok metropolitan region with a population of approximately 10 million.
Treatment infrastructure
Water-treatment plants and distribution
Operates the Sam Saeb, Bangkhen, Mahasawat, and other treatment plants drawing from the Chao Phraya and Mae Klong river systems. Total treatment capacity approximately 6 million cubic metres per day.
Tariff and revenue
Progressive tariff structure
MWA operates under a progressive block-tariff structure set by the Ministry of Interior and Cabinet. Residential, commercial, and industrial tariffs vary. Total revenue approximately $0.58-25B annually, placing MWA among the largest Thai water operators.
Thai water utilities β peer comparison
Major water supply entities in Thailand, 2024
MWA Bangkok
Type
State enterprise (MoI)
Connections
~2M
Coverage area
Bangkok, Nonthaburi, Samut Prakan
Investable?
No (state-owned)
PWA (Provincial Waterworks)
Type
State enterprise (MoI)
Connections
~4M
Coverage area
74 provinces (ex-BKK)
Investable?
No (state-owned)
TTW (Thai Tap Water)
Type
Listed concession (CK-group)
Connections
~350K (Nakhon Pathom, Samut Sakhon)
Coverage area
Nakhon Pathom, Samut Sakhon
Investable?
SET:TTW
EASTW (East Water Resources)
Type
Listed concession
Connections
Industrial, EEC
Coverage area
EEC, Eastern Seaboard
Investable?
SET:EASTW
| Entity | Type | Connections | Coverage area | Investable? |
|---|---|---|---|---|
| MWA Bangkok | State enterprise (MoI) | ~2M | Bangkok, Nonthaburi, Samut Prakan | No (state-owned) |
| PWA (Provincial Waterworks) | State enterprise (MoI) | ~4M | 74 provinces (ex-BKK) | No (state-owned) |
| TTW (Thai Tap Water) | Listed concession (CK-group) | ~350K (Nakhon Pathom, Samut Sakhon) | Nakhon Pathom, Samut Sakhon | SET:TTW |
| EASTW (East Water Resources) | Listed concession | Industrial, EEC | EEC, Eastern Seaboard | SET:EASTW |
Watchpoints 2025-2026
Infrastructure
Non-revenue water reduction progress
MWA's NRW reduction programme is the primary operational KPI. Smart-meter rollout and pipe-replacement progress determines both water-revenue recovery and capital-expenditure intensity over the 2025-2030 period.
Climate risk
Chao Phraya source-water quality
Climate-driven drought reduces Chao Phraya river levels, affecting raw-water availability and treatment costs. The 2019-2020 drought caused MWA to blend coastal-sourced water, raising salinity treatment costs.
Policy
Tariff revision timeline
MWA tariffs have not been significantly revised since 2010. Operating cost inflation and capital-investment requirements are creating pressure for a tariff-adjustment review through the MoI Cabinet process.
Related Market profiles
Peers, parents, partners, agencies, and other Water Utilities & Treatment actors.
Partner
Provincial Waterworks Authority (PWA)
PWA provincial peer state water operator.
Open Market profile β
Sector peer
BEM Water
Listed BEM group's ancillary water-supply concession; transport-conglomerate with water diversification.
Open Market profile β
Sector peer
East Water (EASTW)
Listed EEC, Eastern Seaboard raw water supplier; serves industrial estates, municipalities; direct EEC demand leverage.
Open Market profile β
Sector peer
Thai Tap Water Supply (TTW)
Largest listed Thai water concessionaire; Nonthaburi, Samut Sakhon PWA concession; ~ $1.45B group revenue.
Open Market profile β
Sources + data provenance
Every filing, filing-adjacent register, or trusted industry source cited in this profile.
Metropolitan Waterworks Authority (MWA) β Bangkok Municipal Water
Provincial Waterworks Authority (PWA) β Rest-of-Thailand Municipal Water
| Source | Publisher | Grade | As of |
|---|---|---|---|
| Metropolitan Waterworks Authority (MWA) β Bangkok Municipal Water | Metropolitan Waterworks Authority | Primary | 2026-03-31 |
| Provincial Waterworks Authority (PWA) β Rest-of-Thailand Municipal Water | Provincial Waterworks Authority | Primary | 2026-03-31 |