Indiana Effluent Limitations regulations & environmental compliance analysis

Indiana Effluent Limitations: What you need to know

Governing Law and Regulations

National Pollutant Discharge Elimination System (NPDES) permit program: 327 Indiana Administrative Code (IAC) 5-2-1 to 5-2-23

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Effluent limitations: 327 IAC 5-2-10 and 327 IAC 5-2-11

NPDES discharges: 327 IAC 5-2-1 to 5-2-23

Surface water designations: 327 IAC 2-1-3

Water-quality-based effluent limits (WQBELs): 327 IAC 5-2-11.1 and 327 IAC 5-2-11.6

Regulatory Agencies

Indiana Department of Environmental Management (IDEM) Office of Water Quality

U.S. Environmental Protection Agency (EPA) Region 5

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. The National Pollutant Discharge Elimination System (NPDES) permit controls point source discharges of pollutants into the waters of the state through the establishment of effluent limitations and operating requirements. Indiana's effluent limitation regulations follow the federal regulations. See the national section EFFLUENT LIMITATIONS and the state section NPDES PERMIT for additional information.

Administration and enforcement. IDEM's Office of Water Quality administers and enforces the effluent limitation standards in Indiana.

State Requirements


327 IAC 5-2-1 to 5-2-23

Effluent limitations standards are part of the permit conditions established by the IDEM on quantities, discharge rates, and concentrations of pollutants that are discharged, or will be discharged, from a point source into the "waters of the state" of Indiana. They represent the minimum effluent quality and quantity that must be achieved before discharge of the treated wastewater. The specific effluent limitations granted by the agency consider the ...

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