Penelitian ini dilakukan disekitar lokasi Tempat Pembuangan Akhir ( TPA ) sampah Piyungan Desa Sitimulyo Kacamatan Piyungan Kabupaten Bantul. Tujuannya mengetahui pengaruh air lindi terhadap kualitas air tanah dan air permukaan, mengetahui sebaran air lindi, mengetahui tingkat pencemaran air tanah dan air permukaan dan mengetahui pengaruh keberadaan TPA Piyungan terhadap kesehatan lingkungan. Mengetahui penelitian yang digunakan adalah metode deskriptif yang bertujuan membuat deskripsi secara sistematis, aktual akurat mengenai fakta dan sifat populasi daerah tertentu. Data yang digunakan meliputi data primer dan sekunder, data primer siperoleh dengan menggunakan pengukuran secara langsung dilapangan dan pengambilan sampel air untuk analisi di laboratorium. Data sekunder diperoleh dari studi pustaka, laporan hasil penelitian dan instansi yang terkait dengan penelitian. Cara analisis data menggunakan analisis grafik, analisis kekurangan dan analisis indeks keragaman hewan makrobentos. Hasil penelitian menunjukkan bahwa keberadaan Tempat Pembuangan Akhir (TPA) Piyungan telah mempengaruhi air tanah dan air permukaan, hal ini diketahui dari hasil uji laboratorium yang menunjukkan kandungan unsure kimia telah melebihi ambang batas Baku mutu air. Pola penyebaran air lindi mengikuti arah aliran sesuai dengan kontur air tanah yaitu menujuke arah Utara-Barat laut dari lokasi TPA Piyungan, sendangkan pola penyebaran air permukaan mengikuti saluran alami menuju Sungai Opak. Tingkatpencemaran air tanah termasuk dalam kategori berat terutama untuk kandungan Khlorida, Amonium, Sulfida dab Nitrat, untuk air permukaan termasukdalam katagori tercemar ringan. Keberadaan Tempat Pembuangan Akhir (TPA) telah berpengaruh terhadap kesehatan masyarakat sekitar, hal ini dibuktikan dari hasil wawancara dengan penduduk yang telah mengalami gangguan kesehatan berupa rasa gatal.

This research is done in the rubbish landfill of Piyungan, Sitimulyo Village, and the district of Piyungan, the regency of Bantul. The aim of this research were as follows to knowing the leachate influence toward quality of groundwater and surface water, knowing the propagate the leachate, knowing the level of pollution of the groundwater and surface water and knowing the influence of existence of Piyungan landfill toward the environment physical condition. The research method that is used is descriptive method that has goal to make systematical, actual and accurate description about the facts and characteristic population in the certain area. The data that is used are primary and secondary data; the primary data is achieved by doing the directly measurement in the field and by taking the water sample that is being analyzed in laboratories. Literatures, the report of research result and the related institution with the research achieve the secondary data. The way to analysis data is graphic analysis, the spatial analysis, and index diversity analysis of macro benthos. The result of this research shows that the existence of Piyungan landfill has influenced the groundwater and surface water, this is known from the laboratories test result that is telling that substance of chemical element has been more than of water quality of standard limit. The spread of leachate is following the stream direction based on groundwater contour, which is going to North – Northwest from the location of the Piyungan landfill, meanwhile the spread of surface water is following the nature stream to Opak river. The groundwater pollution level is in the category of heavy level especially for the substance of Chloride, Ammonium, Sulfide and Nitrate, and for the surface water is in category of light level. The existence has influenced toward the environment society health, this is proved by the result of the interview with the inhabitant who have experienced the health disturbing like scratchy and irritated skin.

Kata Kunci : Lingkungan Hidup,Pengelolaan Sampah,Pencemaran Air Tanah, groundwater, surface water, landfill, leachate, and pollution.