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CEA opens bidding for second stage of Loreto's treatment plant, worth over 66 million pesos

Companies have until August 20 to submit proposals; the project will raise treatment capacity from 60 to 90 liters per second, serving more than 16,300 residents.

By Miguel Díaz Miró · Responsible editor ·
Infrastructure of Loreto's wastewater treatment plant undergoing modernization.

The State Water Commission (CEA) opened the bidding process for the second stage of the rehabilitation and expansion of Loreto's Wastewater Treatment Plant (PTAR), a state investment of more than 66 million pesos, the agency's director general, Tatiana Davis Monzón, announced.

Interested companies have until August 20 to submit their technical and financial proposals, according to the call for bids. With this second phase, the plant will go from running two 30-liter-per-second modules to three modules of the same capacity, raising total treatment from 60 to 90 liters per second for a population of more than 16,300 residents.

The first stage, carried out between 2025 and early 2026, included demolishing obsolete infrastructure, building the third module, and installing electromechanical equipment, anoxic tanks, activated-carbon filtration, a sludge dehydrator and two compact pretreatment units. Electrical and hydraulic interconnection work continues in parallel.

Why it matters if you live in Loreto

  • A higher-capacity plant lowers the risk of untreated discharges into the ground and the coastline — a sensitive issue in a municipality whose economy depends on the sea and nautical tourism.
  • Treated water can be reused to irrigate green areas, freeing up drinking water for human consumption in a region with limited aquifers.
  • Deficient treatment is a frequent cause of foul odors and sewage pooling in neighborhoods near saturated plants; adding modules is aimed precisely at avoiding that saturation.

For construction companies

The window for technical and financial proposals closes on August 20. Details of the call can be consulted directly with CEA, whose state public-works processes are published through the official channels of the Baja California Sur government.

Loreto is one of the state's least-populated municipalities, but its sanitation load grows during the tourist season, when demand on the network increases. Expanding to 90 liters per second is meant to give the plant operating headroom beyond current demand.

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