Pompa booster merupakan mesin yang akan meningkatkan tekanan untuk mendistribusikan air dengan jangkauan yang luas, disebut pompa booster karena berfungsi sebagai pompa pendorong atau meningkatkan tekanan. pada penelitian ini dilakukan pengumpulan data dan perhitungan dari data yang didapatkan. dari hasil perhitungan akan dianalisa efisiensi motor induksi 3 fasa tersebut sebagai penggerak pompa booster yang ada di karang balik tarakan, kalimantan utara pada hari pertama motor 1 induksi 3 fasa setelah di lakukan perhitungan didapatkan nilai dari pip sebesar 4924 watt, potpur 4922 watt, kecepatan (nr) 2995,2 rpm, arus 8,6 ampere, torsi 15,70 newton meter, efisiensi 99 %. pada hari ke dua motor 2 induksi 3 fasa setelah di lakukan perhitungan didapatkan nilai pinput sebesar 4995 watt, pour 4992 watt, kecepatan (nr) 3000 rpm, arus 8,5 ampere, torsi 15,90 newton meter, efisiensi 99 %. pada hari ke tiga motor 3 induksi 3 fasa setelah dilakukan perhitungan di dapatkan nilai pinput sebesar 3902 watt, pourpur 3900, kecepatan (nr) 2754 rpm, arus 7 ampere, torsi 13,53 newton meter, efisiensi 99%. pada ketiga motor yang diteliti memiliki nilai efisiensi yang sangat baik yaitu 99 %, di mana nilai efisiensi yang baik dapat mempengaruhi kinerja motor pada pompa booster, sehingga bisa mendorong air agar terdistribusikan pada warga. faktor lain yang mempengaruhi nilai efisiensi juga dari perawatan yang di lakukan secara berkala oleh tim perawatan. kata kunci: pompa booster, motor induksi 3 fasa, efisiensi

Booster pump is a machine that increase the pressure to distribute water with a wide range, called a booster pump because it functions as a booster pump or increases pressure. in this study, the data collection and calculations were carried out from the data obtained. from the calculation results, the efficiency of the 3- phase induction motor was analyzed as a booster pump drive in karang balik tarakan, north kalimantan. on the first day of the 3-phase induction on 1 motor was carried out, it was obtained the values from pinput of 4924 watts, pour of 4922 watts, speed (nr) was 2995.2 rpm, current was 8.6 amperes, torque was 15.70 newton meters, efficiency was 99%. on the second day of the 3-phase induction on 2 motor, the pipur value was 4995 watt, poutput was 4992 watt, speed (nr) was 3000 rpm, current was 8.5 amperes, torque was 15.90 newton meters, efficiency was 99%. on the third day of the 3-phase induction 3-phase motor were carried out, the pinput values of 3902 watts, pourpur was 3900, speed (nr) was 2754 rpm, current was 7 amperes, torque was 13.53 newton meters, efficiency was 99%. the three motors studied had a very good efficiency value of 99%, where a good efficiency value can affect the performance of the motor on the booster pump. therefore, it can encourage water to be distributed to residents. another factor that affects the efficiency value was also from the maintenance that is carried out periodically by the maintenance team. keywords: booster pump, 3 phase induction motor, efficiency.