Metropolitan Waterworks Authority

The Metropolitan Waterworks Authority (MWA) (Thai: การประปานครหลวง) is a Thai state enterprise under the Ministry of Interior.

The MWA began operations on 16 August 1967 under the Metropolitan Waterworks Authority Act B.E. 2510 (1967) to serve potable water to Bangkok, Nonthaburi Province, and Samut Prakan Province. MWA's governor is Mr Thanasak Watanathana. The chairman of the MWA Board is Mr Chareon Passara.

In the reign of King Rama V, when Bangkok had a population of around 333,000, following the king's first visit to Europe in 1897, the king ordered the establishment of a Sanitary Department to provide water to the Bangkok populace. Many still used water from rivers or canals, frequently the source of epidemics. The new department made a survey and dug up a distributary canal of the Chao Phraya River at Sam Lae Sub-district in Pathum Thani Province to the north of Bangkok. Water was drawn though this canal into Bangkok to supply cleaner water.

In 1907, the king made a second visit to Europe. He found that most European countries produced clean, adequate water for their people. Returning to Thailand, he ordered the hiring of French experts to conduct a survey and make suggestions on water procurement for Bangkok. In 1909, the king ordered the Sanitary Department to dig and construct canals and install water pumps in order to deliver water to water treatment plants in the Sam Sen Sub-district. Pipes were installed underground to distribute water throughout the Bangkok area, at a cost of over four million baht and five years of construction. The king called the result "Bangkok Waterworks".

On 13 July 1909, the king ordered the Sanitary Department to treat water for use in Bangkok. The first water treatment plant was set up in 1914.

Demand for water in Bangkok increased rapidly, from 10,000 to 13,000 metres³ per day, most of which was consumed at numerous public water spigots. People in the suburbs of Bangkok, with no water supply, carried pots to take water from them, especially in the summer, when the waterworks increased production to full capacity of 28,800 m³ per day, sufficient for the population at the time. The government's emphasis on improving water supplies in Bangkok led to the merging of the Nonthaburi municipality water supply, Samut Prakan's water supply, and Thonburi's water supply with those of Bangkok Waterworks. A new organization called the "Metropolitan Waterworks Authority", a public enterprise under the Interior Ministry, began operations on 16 August 1967.