Industrial Process Cooling Towers
Air Toxics Notebook
Industrial Process Cooling Towers
Applicability
eCFR Subpart Q 
[ecfr.gov]
This subpart applies to:
- Industrial process cooling towers that are operated with chromium-based water treatment chemicals and are either Major Sources or located at Major Sources of HAPs*.
"Chromium-based water treatment chemicals" means any combination of chemicals containing chromium used to treat water.
*Major Sources of HAPs emit or have the potential to emit:
- ≥ 10 tons/year of any single HAP; or
- ≥ 25 tons/year of total HAPs.
- Area Sources emit less than Major Sources.
Rules apply to small, area sources?
No
Known Sources in NDEE Jurisdiction
No
Date of Original Final Rule
Amendments Dates
04/07/2006
State Regulations
Title 129, Chapter 13, Section 002.09
Previously: Chapter 28, Section 001.04.
Sources are also responsible for ensuring they are in compliance with current federal requirements found for this subpart in the CFR.
Federal Regulations
40 CFR 63.400
Related Rules
eCFR Subpart Q 
[ecfr.gov]
FAQ's, Fact Sheets, and Rules Summaries
Texas CEQ - Rule Flowchart [tceq.texas.gov]
EPA's Subpart Q Website 
[epa.gov] - Contains federal register notices
| 377 KB | 1Q - Overview.pdf |
| 769 KB | 1Q - Compliance Checklist.pdf |
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