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The objective of this research is to make a constant pressure control in water supply with the method of PID using PLC Siemens S7-1200 as controller and also to monitor the process of its work system from a distance through internet of things (IoT). Water distribution system is created utilizing 3 phase pump which will supply water from the tank. Pressure sensor will be used as analog input signal of PLC to detect the pressure of water in the pipe. Using inverter, water pressure will be kept constantly matched with the desirable set point through the setting of pump speed using digital PID method that is available on PLC. Score of set point is done through HMI of touch panel KTP700basic. By using wifi communication that has been connected to internet, PLC data can be sent to cloud server through raspberry pi3 using MQTT protocol. Raspberry pi3 program is design using the java script coding language. Research result showing that this system is able to keep the water pressure in a constant level of 1.2 bar in water supply. It is also able to monitor the water pressure through HMI and handphone via IoT Technology in the GoIoT server.