Thrissur is one of the fastest-growing municipalities and most important industrial centers in Kerala. The Kol wetlands, which are one of the most productive rice-growing regions in the state, lie there in spite of its industrial significance. Famous for their distinctive landforms and abundant rice production, these wetlands are currently experiencing deterioration as a result of declining water quality. The direct release of industrial effluents and domestic sewage into the Kol wetlands has made nearby water sources unfit for drinking and irrigation. This study intends to assess the quality of irrigation water using the Irrigation Water Quality Index (IWQI) and geospatial methods in bodies of water close to the Kol wetlands. Both the pre-monsoon and post-monsoon survey results showed that the majority of water samples taken from canals and Kol fields were deemed of low quality. The sample with the highest water quality index (WQI) value of 847 during the pre-monsoon season was notably that taken from the Thripayar bridge, indicating that it needs to be treated urgently before any household use. The results emphasize that, along with the Water Quality Index, multivariate and geostatistical approaches may be useful for monitoring water quality trends in tropical urban wetland habitats.