Objective: This study aims to evaluate the quality of landfill leachate that has been treated in a wastewater treatment plant. Mathods: Leachate samples were taken for 12 months (January-December) in 2018. The leachate quality parameters studied were: BOD 5 , COD, TSS, total N, and heavy metals (Hg and Cd). Results: The results showed that the BOD 5 quality met environmental quality standards in May, June, July, September, October and December, COD exceeded environmental quality standards, TSS

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... et environmental quality standards in February, March, August, and December, N total met quality standards environment for 11 months, only December did not meet environmental quality standards, heavy metals (Cd and Hg) were below environmental quality standards. Conclusion: The Sliwunglandfill to conduct an approach study that can reduce the BOD 5 , COD, and TSS values so that they do not exceed the specified quality standards.