The Municipality of Polomolok is this year's cleanest and greenest municipality in South Cotabato. The announcement of winners of 2018 Search for the Cleanest and Greenest Local Government Unit in South Cotabato was held during the opening ceremonies of the 19th Tnalak Festival held at the South Cotabato Sports Complex on July 13, 2018.
Last year's winner, the Municipality of Surallah,
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