Campo Militar No 1 A Wastewater Treatment Plant, Ciudad de México, Mexico

Campo Militar No 1 A is a wastewater treatment plant located in the Observatorio neighborhood of Ciudad de México, within the Miguel Hidalgo borough. The plant serves a population of around 27,000, placing it in the medium agglomeration category for Mexican wastewater infrastructure. As a plant in Mexico, it is subject to the country's federal water pollution control standards, which require treatment to meet discharge limits for organic matter and suspended solids. The plant discharges into the local drainage network within the Valley of Mexico basin, which ultimately drains to the Pánuco River and then to the Gulf of Mexico. The surrounding urban environment means the plant plays a key role in protecting downstream water quality in a densely populated region.

The plant is situated in the Valley of Mexico, an endorheic basin that historically contained lakes but now drains through artificial channels to the Tula River, a tributary of the Pánuco River, which flows to the Gulf of Mexico. The watershed supports diverse aquatic life and is important for regional water supply, making effective treatment critical to prevent nutrient and pathogen pollution.