Adjuntas WWTP | Wastewater Treatment Plant in Adjuntas, Puerto Rico

Adjuntas WWTP is a municipal wastewater treatment facility located in the town of Adjuntas, Puerto Rico, serving a population of about 6,099 residents. Situated in the mountainous interior of the island, the plant is part of the broader wastewater management system for the region, which is regulated under the US Clean Water Act and administered by the Puerto Rico Environmental Quality Board (EQB). As a small-to-medium agglomeration, the plant is expected to meet secondary treatment standards under the Clean Water Act, which requires removal of at least 85% of biochemical oxygen demand and suspended solids. The plant's designed capacity is 1.00 million gallons per day, indicating it is sized for the local population. Typical facilities of this scale in Puerto Rico use activated sludge or lagoon systems. The plant discharges treated effluent into local streams that eventually drain into the Caribbean Sea. The surrounding watershed supports diverse aquatic life and provides water resources for the region. Proper treatment is essential to protect downstream water quality and the sensitive coastal ecosystems of Puerto Rico.

Adjuntas is located in the mountainous interior of Puerto Rico, and treated wastewater from the plant likely flows into the Río Grande de Arecibo watershed, which drains northward to the Atlantic Ocean. The region's streams support freshwater biodiversity and are important for local water supply. Downstream, the river meets the Atlantic coast, where nearshore habitats such as mangroves and coral reefs require protection from nutrient pollution and pathogens.