We report on a micro-machined thin-film temperature sensor for measuring water temperature mainly in the water distribution network. The sensor is made of platinum (Pt) thin-film; which dimensions are 12255 × 11 × 0.34 micrometer. The investigation is performed for two versions of the considered sensor, where the substrate material is changed from glass to silicon. The sensors are tested at a constant 0.5 mA current supply. The supply current intensity is intentionally kept low, in order to avoid Joule Self-heating; which is mandatory for ambient temperature measurement. Both sensors show similar Joule selfheating at low current supply. The target is to co-integrate this temperature sensor along with some other sensors on the same chip, in order to deliver a monolithic multi-parametric sensing module. Hence, silicon substrate-based temperature sensor is finalized; as this material facilitate the fabrication and cointegration step among multiple sensors. The ascertained sensor shows excellent linearity in the first phase characterization in a laboratory environment within the temperature range from 25 °C to 90 °C. The confidence interval (95%) of the measured data is better than 0.2 °C.