ParAs Wastewater Treatment Plant, Parás, Nuevo León, Mexico

The ParAs wastewater treatment plant is located in Parás, a small town in the state of Nuevo León, Mexico. The facility provides secondary treatment to serve a population of 869 residents, reflecting its role in managing local domestic wastewater. With a designed capacity of 432.00 cubic meters per day and a current discharge volume of 172.80 cubic meters per day, the plant operates below its full capacity. As a secondary treatment plant, ParAs meets the standard level of treatment required for municipal wastewater in Mexico under the national water quality regulations (NOM-001-SEMARNAT-1996). These regulations set discharge limits for parameters such as biochemical oxygen demand and total suspended solids, ensuring that treated effluent is safe for release into the environment. The plant's scale and treatment level are appropriate for a small agglomeration of under 10,000 people. The treated wastewater from ParAs is discharged into the local hydrological system, which ultimately drains into the Rio Grande basin. This river is a critical water source for both Mexico and the United States, supporting agriculture, ecosystems, and communities along its course. The plant's operation helps protect downstream water quality in this transboundary watershed.

ParAs is located in the semi-arid region of Nuevo León, where water resources are limited and carefully managed. The treated effluent from the plant flows into local arroyos and eventually reaches the Rio Grande (Río Bravo), a major river that forms the border between Mexico and the United States. The Rio Grande supports diverse aquatic life and is an important migratory corridor for birds. Protecting water quality in this basin is essential for maintaining ecological balance and meeting the water needs of downstream communities.