The Gary Sanitary District (GSD) provides sewage treatment and wastewater services to the City of Gary and portions of the neighboring communities of Merrillville, Hobart, and Lake Station. GSD operates a 60 million gallons per day (MGD) wastewater collection treatment system and wastewater treatment plant (WWTP). The wastewater collection system (WCTS) is ninety percent combined, and consists of approximately 375 miles of sanitary and storm sewers, twelve combined sewer overflow (CSO) regulators, and twenty-eight pumping stations. Five of the CSO outfalls discharge to the Little Calumet River, and seven of the CSO outfalls discharge to the Greater Calumet River. The City’s service area is fifty square miles. The actual service population, is estimated at 160,000.

GSD carries out its responsibilities under the standards and regulations of the United States Environmental Protection Agency and the Indiana Department of Environmental Management.

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