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In page Environmental issues in Thailand:

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The government continues to invest in wastewater treatment plants. In 2000, enough treated water was available to support 29% of the population, with more treatment plants under construction. Upon completion, treated water will support 65% of the population. The most common water treatments are inexpensive to build and maintain. They include oxidation ditches, aerated lagoons, and stabilization ponds. The government is also investigating more effective and modern techniques such as constructed wetlands.[citation needed]