Smart IoT based water level sensing for overhead tanks - Part 9 (Analog Value Read)

I started using the Water level sensor circuit which is using the PCB based water level sensor. ADS1114IDGSR is used to read the sensor analog value and the I2C digital output value is read by ESP-01. In this process, 

- there is Wi-Fi module (ESP-01), 
- Buck-Boost circuit (for battery and power input option), 
- there might be poor PCB Layout 

and the entire analog circuit is exposed to the interference from all these. So, can you expect the Analog value read to be constant or having minimal variation. No? This is how the values of read. A simple example to explain how Analog values can vary under interference. Any opinion here?