Water quality monitoring in the Xochimilco peri-urban wetland: experiences engaging in citizen science

Despite expectations, water quality in canals near low-impact activities such as agroecological farming and abandoned chinampas in the Xochimilco peri-urban wetland did not consistently meet national and international guidelines for irrigation. Significant seasonal variations were observed in pH (>9), dissolved oxygen (<6.5 mg/L), conductivity (>2000 μS/cm), and Escherichia coli concentrations (>240 CFU/100 mL). The study, involving citizen scientists, analyzed water quality across seven canals and one lake over four years, revealing that narrow, shallow canals with low water flow may exacerbate poor water quality. Only an abandoned agricultural area met most guidelines, highlighting the potential for structural modifications to improve conditions. Citizen science engagement also raised awareness about anthropogenic impacts on this ecologically and culturally significant UNESCO World Heritage Site.

Pérez-Belmont, P., Alvarado, J., Vázquez-Salvador, N., Rodríguez, E., Valiente, E., & Díaz, J. (2019). Water quality monitoring in the Xochimilco peri-urban wetland: experiences engaging in citizen science. Freshwater Science, 38(2), 342–351. https://doi.org/10.1086/703395