Harris County, TX Environmental Rules: Vehicle Idling Restrictions (2026)
Key Facts
- Idling limit
- Five consecutive minutes
- Vehicle threshold
- Over 14,000 pounds GVWR
- Counties covered
- Eight HGB nonattainment counties
- Season
- April through October
Summary
TCEQ Rule 30 Texas Administrative Code 114.512 limits commercial vehicles over 14,000 pounds to five minutes of idling in the eight-county Houston-Galveston-Brazoria nonattainment area, including Harris County. Sleeper berths, emergency response, and traffic delays are exempt. Local enforcement is by Harris County Pollution Control.
Sec. 382.0191. IDLING OF MOTOR VEHICLE. (a) In this section, "idling" means allowing an engine to run while the motor vehicle is not engaged in forward or reverse motion. (b) The commission may not prohibit or limit the idling of any motor vehicle with a gross vehicle weight rating greater than 8,500 pounds that is equipped with a 2008 or subsequent model year heavy-duty diesel engine or liquefied or compressed natural gas engine that has been certified by the United States Environmental Protection Agency or another state environmental agency to emit no more than 30 grams of nitrogen oxides emissions per hour when idling.
Full Breakdown
TCEQ rule 30 TAC 114.512 prohibits commercial vehicles with gross vehicle weight rating over 14,000 pounds from idling for more than five consecutive minutes when not in motion in the Houston-Galveston-Brazoria ozone nonattainment area, which covers Harris, Brazoria, Chambers, Fort Bend, Galveston, Liberty, Montgomery, and Waller counties. The rule applies April through October when ground-level ozone formation is highest. Sleeper-berth occupancy, emergency vehicles, traffic-flow delays, equipment-power needs, and vehicle maintenance are exempt under 114.517. The Harris County Pollution Control Services Department investigates complaints and supports TCEQ enforcement. Federal EPA mobile-source rules also apply at port and industrial facilities.
Violations & Fines
Idling violations under 30 TAC 114.512 carry TCEQ administrative penalties up to twenty-five thousand dollars per day per violation. Harris County Pollution Control works with TCEQ Region 12 to issue notices, settlements, and abatement orders.
Frequently Asked Questions
How long can a Harris County truck idle legally?
Who enforces diesel idling in Harris County?
Sources & Official References
Other rules in Harris County
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