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Illinois Thermal Discharges: What you need to know

Governing Law and Regulations

Generally: 35 Illinois Administrative Code (IAC) 302.211

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Thermal standards: 35 IAC 302.211

Secondary contact waters: 35 IAC 302.408

Regional thermal standards:

Lake Michigan: 35 IAC 302.506 to 302.509

Ohio River: 35 IAC 303.311

Wabash River: 35 IAC 303.321

Mississippi River: 35 IAC 303.331 to 303.361

Lake Sangchris: 35 IAC 303.502

Alternative limits: 35 IAC 304.141 and 35 IAC 106.1100 to 1160

Regulatory Agency

Illinois Environmental Protection Agency (IEPA) Bureau of Water Division of Water Pollution Control

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Illinois follows the federal Clean Water Act in establishing limits for allowable thermal discharges into state waters. The limits established are based on the nature and location of the receiving water.

Administration and enforcement. IEPA's Division of Water Pollution Control in the Bureau of Water is responsible for the administration and enforcement of the state's thermal discharge regulations.

State Requirements

THERMAL STANDARDS

35 IAC 302.211

As a general rule, Illinois dischargers may not create abnormal temperature variations in the water that would adversely affect aquatic life. The normal daily and seasonal temperature fluctuations must not raise the water temperature by more than 5°F (2.8°C).

In numerical terms, dischargers are prohibited from raising the temperature of the receiving water above the following limits for more than 1 percent of the hours in any 12-month period. At no time may these listed temperatures be raised by more than 3°F (1.7°C):

Month
°C
°F
=================
JAN.
16
60
FEB.
16
60
MAR.
16
60
APR.
32
90
MAY
32
90
JUNE

>> Read more about Thermal Discharges

More on this topic:

Governing Law and Regulations
Regulatory Agency
Comparison: State vs. Federal
State Requirements

State Requirements

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Illinois Thermal Discharges Resources

Thermal Discharges Products

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