CalPortland Rillito Cement Plant - Marana, Arizona Cement Manufacturing Facility

CalPortland Rillito Cement Plant is a cement manufacturing facility located at 11115 N Casa Grande Hwy in Marana, Pima County, Arizona. The plant is operational and serves the regional construction industry with cement products. As a cement plant, it is classified under multiple NAICS codes including 212312 (crushed stone mining), 325110 (petrochemical manufacturing), and 327310 (cement manufacturing), indicating a vertically integrated operation. The facility operates under the regulatory framework of the United States Environmental Protection Agency (EPA), which enforces the Clean Air Act (CAA) for emissions, Clean Water Act (CWA) for water discharges, and Resource Conservation and Recovery Act (RCRA) for waste management. Cement plants are subject to National Emission Standards for Hazardous Air Pollutants (NESHAP) and New Source Performance Standards (NSPS). The plant's location in Arizona places it within a region with growing urban demand and specific air quality management challenges. Cement production is energy-intensive and generates significant CO2 emissions from calcination and fuel combustion. The plant's environmental significance includes its contribution to local air emissions and potential water use. Community proximity to Marana and Tucson may raise considerations regarding particulate matter and other pollutants. The facility's role in supplying cement for infrastructure and construction underscores its economic importance in the region.

Cement plants are among the largest industrial sources of carbon dioxide, particulate matter, and nitrogen oxides. In Arizona, the arid climate and growing urban areas like Tucson create a context where air quality management is critical. The plant's proximity to residential areas in Marana and Pima County means that emissions of PM10 and PM2.5 are closely monitored under the Clean Air Act. Water use for cooling and dust suppression is also a concern in the water-scarce Southwest.