For decades, the residents of this Patagonian capital watched the water with a mix of affection and caution. They gathered in Abrazos al Río—human chains intended to protect the waterway—as high bacteria levels frequently forced the closure of the very beaches that define the city's summer life. The problem was structural: an aging system that simply could not keep pace with the growth of a city that had surpassed 100,000 people.
The solution required a literal change in direction. Instead of allowing gravity to pull waste down toward the riverbank, the city now pumps its effluent uphill, away from the floodplain and toward a semi-arid plateau. One can almost hear the steady, mechanical thrum of the pumps working against the incline, a sound that represents the heavy lifting of modern sanitation.
In the vast expanse of the new facility, a series of stabilization ponds uses the sun and the Patagonian wind to break down what was once a pollutant. The water that leaves these ponds is no longer a burden; Javier Iud noted that technicians are currently evaluating its use to irrigate crops and pastures on the dry lands overlooking the valley, turning a legacy of contamination into a source of growth.
This infrastructure is not merely a technical triumph but a financial one. The utility now covers 75% of its operating costs through its own revenue, a rare independence from the provincial treasury. The river carries its name—the Black River—but for the first time in a generation, its character is determined only by the soil and the silt of the Andes, not by the city on its banks.