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Life sciences · Journal article
Journal of Environmental Engineering · September 26, 2026
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Abstract Wastewater-based epidemiology (WBE) has emerged as a major public health innovation catalyzed by the COVID-19 pandemic. However, its potential remains underexplored during and after COVID-19’s transition to endemicity. This study evaluates WBE’s potential to identify the COVID-19 pandemic-to-endemic transition and to provide early warnings across multiple surveillance systems for influenza A (IAV) and B (IBV), respiratory syncytial virus (RSV), and SARS-CoV-2 in the postpandemic era. We monitored SARS-CoV-2 N1 concentrations in wastewater from April 8, 2020, and July 31, 2025, generating the earliest and longest-running wastewater dataset in Detroit, MI. A peak identification method was implemented to identify the pandemic-to-endemic transition by comparing the frequency of N1 concentration peaks between phases. During the endemic phase, from October 1, 2022, and March 31, 2025, we monitored RSV, IAV, IBV, and SARS-CoV-2 in Detroit’s wastewater. Pearson correlations were implemented to quantify the associations between wastewater concentrations and clinical, syndromic, and digital epidemiological data. Time-lagged cross-correlation (TLCC) was used to examine temporal dynamics among these datasets and identify the earliest emerging data for each disease and time lags. Extensive literature studies were conducted to elucidate the time-lag mechanisms for each disease, embracing the TLCC results. Random forest models were established to predict clinical cases based on WBE datasets. This was among the first studies using WBE-based approaches to identify pandemic-to-endemic transition of SARS-CoV-2. The relationships of wastewater data to traditional clinical, syndromic, and digital epidemiological surveillance data were systematically analyzed during the endemic phase of these respiratory diseases. This study demonstrates the predictive value of WBE during the endemic phase, providing early warnings and predictions for seasonal respiratory diseases, including COVID-19, influenza, and flu-like disease.