GAMBARAN SISA KLOR DAN MPN COLIFORM JARINGAN DISTRIBUSI AIR PDAM Pratiwi Hermiyanti, Endang Tri Wulandari Politeknik Kesehatan Kementerian Kesehatan Surabaya, Jl. Pucang Jajar Tengah 56 Surabaya 60282 pratiwi.kesling@gmail.com Abstract: PDAM water that has a long distance from the reservoir almost does not smell chlorine so it is possible less than the quality standards can cause the bacteria in the water distribution of PDAM. Purpose of this research to know residual content of chlorine and MPN coliform on PDAM water distribution of Surabaya city 2017. The type of research is observational analytic with cross sectional design. The sampling procedure was performed at 4 locations with replication 3 times morning and daytime. Examination of chlorine residual content using comparator test kit, MPN coliform in laboratory, while pH, water temperature and air temperature is done in the field. Data were analyzed by multiple linear regression test presented in tabular form and analyzed and compared with standard quality standard. The results of the average residual chlorine morning 0,57 mg / l and daytime 0,5 mg / l, have fulfilled the standard of quality of residual chlorine waste water content that is 0,2-1,0 mg / l. The average MPN coliform in the morning was 8.5 colonies / 100 ml of sample and the daytime was 10.7 colonies / 100 ml of sample, so during the day the sample did not meet the standard quality of MPN coliform of piping water for 10 colonies / 100 ml samples. Average morning pH 7.7 and daytime 7.8, morning water temperature 26.8°C and daytime 27.7°C and morning air temperature 27.7°C and daytime 30,3°C. The conclusion obtained is the distribution distance affect the residual chlorine content and MPN coliform (p <0,05). Suggestion for PDAM is need to be done chlorine addition to active chlorine at furthest point that is 9 kilometers can fulfill requirement. Keywords: Water Distribution Distances, Chlorine Time Remain, MPN Coliform, temperature. Abstrak: Air hasil olahan PDAM yang memiliki jarak jauh dari reservoir hampir tidak berbau klor sehingga dimungkinkan kurang dari standar baku mutu sehingga menyebabkan adanya bakteri pada distribusi air PDAM. Tujuan penelitian adalah mengetahui kadar sisa klor dan MPN coliform pada distribusi air PDAM Kota Surabaya tahun 2017. Jenis penelitian adalah analitik observasional dengan desain cross sectional. Prosedur pengambilan sampel dilakukan pada 4 lokasi dengan replikasi 3 kali pagi dan siang hari. Pemeriksaan kadar sisa klor menggunakan komparator test kit, MPN coliform pada laboratorium, sedangkan pH, suhu air dan suhu udara dilakukan di lapangan. Data dianalisis dengan uji regresi linier ganda yang disajikan dalam bentuk tabel dan dianalisis serta dibandingkan dengan standar baku mutu. Hasil penelitian rata-rata sisa klor pagi hari 0,57 mg/l dan siang hari 0,5 mg/l, telah memenuhi standar baku mutu kadar sisa klor air perpipaan yaitu 0,2-1,0 mg/l. Rata-rata MPN coliform pagi hari 8,5 koloni/100 ml sampel dan siang hari 10,7 koloni/ 100 ml sampel, sehingga pada siang hari sampel belum memenuhi standar baku mutu MPN coliform air perpipaan sebesar 10 koloni/ 100 ml sampel. pH rata-rata pagi hari 7,7 dan siang hari 7,8, suhu air pagi hari 26,8 o C dan siang hari 27,7 o C dan suhu udara pagi hari 27,7 o C dan siang hari 30,3 o C. Jarak distribusi mempengaruhi kadar sisa klor dan MPN coliform (p< 0,05). Saran bagi PDAM adalah perlu dilakukan penambahan klor agar klor aktif pada titik terjauh yaitu 9 km dapat memenuhi syarat. Kata Kunci: Jarak Distribusi Air PDAM, Kadar Sisa Klor, MPN Coliform, suhu 118