Iowa Hazardous Air Pollutants regulations & environmental compliance analysis

Iowa Hazardous Air Pollutants: What you need to know

Governing Law and Regulations

National emissions standards for hazardous air pollutants (NESHAP): 40 CFR 61 and 40 CFR 63

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Adoption by reference of NESHAPs: Iowa Administrative Code (IAC) 567-23.1(3)(455B) and IAC 567-23.1(4)(455B)

Regulatory Agencies

Iowa Department of Natural Resources (DNR) Environmental Services Division Air Quality Bureau

Linn County Public Health Department Air Quality Division

Polk County Public Works Air Quality Division

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Iowa does not regulate any hazardous air pollutants (HAPs) in addition to the federally listed pollutants. Iowa has adopted by reference most of the federal NESHAP rules, including the source-specific NESHAPs, also known as maximum achievable control technology (MACT) standards. DNR periodically updates its adoption of the federal standards to include newly promulgated NESHAPs applicable to sources in the state. Major sources of HAPs that are not included in a source category specifically covered by the federal standards must make MACT determinations on a case-by-case basis. For further information, see the national section HAZARDOUS AIR POLLUTANTS.

Administration and enforcement. DNR administers and enforces the NESHAP rules in Iowa, while EPA administers and enforces those NESHAP rules not adopted by DNR on a case-by-case basis. The local air quality agencies are responsible for implementing and enforcing the federal and state requirements within their jurisdictions, as well as any local regulatory requirements.


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