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Pemex wastewater treatment plant serves Salamanca, Guanajuato, Mexico, with a population of approximately 203,000. It operates under Mexico's national water regulations.
Salamanca wastewater treatment plant serves approximately 160,000 people in Guanajuato, Mexico. It operates under Mexican water quality regulations (NOM-001-SEMARNAT-1996) for discharge into the Lerma River basin.