Where this text comes from
- Citation
- 40 CFR Part 60, Subpart Dc
- Official title
- Subpart Dc—Standards of Performance for Small Industrial-Commercial-Institutional Steam Generating Units
- Text as of
- eCFR current through 2026-10-28, retrieved 2026-10-30
- Latest amendment
- 2020-10-07
- Source note
- 72 FR 32759, June 13, 2007, unless otherwise noted.
Headings and quoted sections on this page are copied from the eCFR text of Subpart Dc without changes. AirPermitHub checks eCFR every week and reviews any change before publishing it, so this page can trail eCFR by a few days. eCFR is maintained by the Office of the Federal Register and the Government Publishing Office. It is not an official legal edition of the CFR, and it does not show how an agency has applied the rule in a permit.
Where to look in Subpart Dc
Sections sorted by the words in their eCFR headings. Read the full section before relying on it; requirements often sit in more than one place.
Who the subpart covers, in the rule's own words
The sections that set out what the subpart applies to, quoted in full from eCFR. Dates, sizes, and other figures are the rule's, not AirPermitHub's.
§ 60.40c Applicability and delegation of authority.
Open in eCFR(a) Except as provided in paragraphs (d), (e), (f), and (g) of this section, the affected facility to which this subpart applies is each steam generating unit for which construction, modification, or reconstruction is commenced after June 9, 1989 and that has a maximum design heat input capacity of 29 megawatts (MW) (100 million British thermal units per hour (MMBtu/h)) or less, but greater than or equal to 2.9 MW (10 MMBtu/h).
(b) In delegating implementation and enforcement authority to a State under section 111(c) of the Clean Air Act, § 60.48c(a)(4) shall be retained by the Administrator and not transferred to a State.
(c) Steam generating units that meet the applicability requirements in paragraph (a) of this section are not subject to the sulfur dioxide (SO2) or particulate matter (PM) emission limits, performance testing requirements, or monitoring requirements under this subpart (§ 60.42c, § 60.43c, § 60.44c, § 60.45c, § 60.46c, or § 60.47c) during periods of combustion research, as defined in § 60.41c.
(d) Any temporary change to an existing steam generating unit for the purpose of conducting combustion research is not considered a modification under § 60.14.
(e) Affected facilities (i.e. heat recovery steam generators and fuel heaters) that are associated with stationary combustion turbines and meet the applicability requirements of subpart KKKK of this part are not subject to this subpart. This subpart will continue to apply to all other heat recovery steam generators, fuel heaters, and other affected facilities that are capable of combusting more than or equal to 2.9 MW (10 MMBtu/h) heat input of fossil fuel but less than or equal to 29 MW (100 MMBtu/h) heat input of fossil fuel. If the heat recovery steam generator, fuel heater, or other affected facility is subject to this subpart, only emissions resulting from combustion of fuels in the steam generating unit are subject to this subpart. (The stationary combustion turbine emissions are subject to subpart GG or KKKK, as applicable, of this part.)
(f) Any affected facility that meets the applicability requirements of and is subject to subpart AAAA or subpart CCCC of this part is not subject to this subpart.
(g) Any facility that meets the applicability requirements and is subject to an EPA approved State or Federal section 111(d)/129 plan implementing subpart BBBB of this part is not subject to this subpart.
(h) Affected facilities that also meet the applicability requirements under subpart J or subpart Ja of this part are subject to the PM and NOX standards under this subpart and the SO2 standards under subpart J or subpart Ja of this part, as applicable.
(i) Temporary boilers are not subject to this subpart.
[72 FR 32759, June 13, 2007, as amended at 74 FR 5090, Jan. 28, 2009; 77 FR 9461, Feb. 16, 2012]
Every section in Subpart Dc
9 sections, in eCFR order. Each link opens the official text.
- § 60.40cApplicability and delegation of authority.Amended 2020-10-07
- § 60.41cDefinitions.Amended 2016-10-31
- § 60.42cStandard for sulfur dioxide (SO2).Amended 2016-10-31
- § 60.43cStandard for particulate matter (PM).Amended 2016-10-31
- § 60.44cCompliance and performance test methods and procedures for sulfur dioxide.Amended 2016-10-31
- § 60.45cCompliance and performance test methods and procedures for particulate matter.Amended 2016-10-31
- § 60.46cEmission monitoring for sulfur dioxide.Amended 2016-10-31
- § 60.47cEmission monitoring for particulate matter.Amended 2016-10-31
- § 60.48cReporting and recordkeeping requirements.Amended 2016-10-31
Amendment history
Dates on which eCFR records a change to any section of Subpart Dc, newest first.
- 2020-10-07
- 2016-10-31
To read the rulemakings behind these dates, search the Federal Register for Subpart Dc. New EPA air rules and proposals also appear in the Federal Air Rule Tracker.
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