South Carolina Mobile Sources regulations & environmental compliance analysis

South Carolina Mobile Sources: What you need to know

Governing Law and Regulations

Employer Trip Reduction: 42 USC 182(d)(1)(B)

Regulatory Agencies
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South Carolina Department of Health and Environment (DHEC) Office of Environmental Quality Control Bureau of Air Quality

U.S. Environmental Protection Agency (EPA)

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. The applicable federal requirements are the only standards that apply to mobile sources in South Carolina. The state has no additional mobile source requirements. See the national section MOBILE SOURCES for more information.

Administration and enforcement. EPA administers and enforces mobile source requirements applicable in South Carolina. DHEC is administering the anti-idling program.

State Requirements


42 USC 182(d)(1)(B)

The Clean Air Act Amendments of 1990 required states that have severe or extreme ozone nonattainment areas to revise their state implementation plans (SIP) by adopting new regulations to reduce work-related vehicle trips and miles traveled by employees. In 1995, Congress amended the law allowing states to remove employer trip reduction (ETR) programs from the SIP, as long as the state can maintain emissions reductions equivalent to those achieved with the ETR program. South Carolina does not have any severe or extreme nonattainment areas for ozone and has not implemented an ETR program.

Additional Guidance


In South Carolina, about half of all man-made air pollution comes from mobile sources like cars, trucks, and off-road vehicles. DHEC offers these tips to reduce mobile source emissions:

  • Drive less. Fewer trips will reduce air ...

Read more about Mobile Sources

South Carolina Mobile Sources Resources

Type Title
Forms Stage II System Decommissioning Notification Form
See all Mobile Sources Resources