eCFR.io
Daily eCFR

Table 2 to Subpart UUUUU of Part 63—Emission Limits for Existing EGUs

Emission Limits for Existing EGUs

  1. CFR
  2. ›
  3. Title 40
  4. ›
  5. Chapter I
  6. ›
  7. Part 63
  8. ›
  9. Subpart UUUUU
  10. ›
  11. Subject Group Other Requirements and Information
  12. ›
  13. Appendix Table 2 to Subpart UUUUU of Part 63
CorpusDaily eCFR
Displayed edition2026-05-22
Last updated2026-05-22

Table 2 to Subpart UUUUU of Part 63—Emission Limits for Existing EGUs

Link to an amendment published at 91 FR 22466, Apr. 27, 2026.

As stated in § 63.9991, you must comply with the following applicable emission limits: 1

Table 2 to Subpart UUUUU of Part 63—Emission Limits for Existing EGUs

[As stated in § 63.9991, you must comply with the following applicable emission limits 1]

If your EGU is in this subcategory . . .For the following

pollutants . . .		You must meet the following emission limits and work practice

standards . . .		Using these requirements, as appropriate (e.g., specified sampling volume or test run duration) and limitations with the test methods in table 5 to this

subpart . . .
1. Coal-fired unit not low rank virgin coala. Filterable particulate matter (PM)3.0E-2 lb/MMBtu or 3.0E-1 lb/MWh 2Before July 6, 2027: Collect a minimum of 1 dscm per run. On or after July 6, 2027: Collect a minimum catch of 6.0 milligrams or a minimum sample volume of 4 dscm per run if using PM CEMS for compliance. For all other compliance demonstration options, collect a minimum of 1 dscm per run.
OROR
Total non-Hg HAP metals5.0E-5 lb/MMBtu or 5.0E-1 lb/GWhCollect a minimum of 1 dscm per run.
OROR
Individual HAP metals:Collect a minimum of 3 dscm per run.
Antimony (Sb)8.0E-1 lb/TBtu or 8.0E-3 lb/GWh
Arsenic (As)1.1E0 lb/TBtu or 2.0E-2 lb/GWh
Beryllium (Be)2.0E-1 lb/TBtu or 2.0E-3 lb/GWh
Cadmium (Cd)3.0E-1 lb/TBtu or 3.0E-3 lb/GWh
Chromium (Cr)2.8E0 lb/TBtu or 3.0E-2 lb/GWh
Cobalt (Co)8.0E-1 lb/TBtu or 8.0E-3 lb/GWh
Lead (Pb)1.2E0 lb/TBtu or 2.0E-2 lb/GWh
Manganese (Mn)4.0E0 lb/TBtu or 5.0E-2 lb/GWh
Nickel (Ni)3.5E0 lb/TBtu or 4.0E-2 lb/GWh
Selenium (Se)5.0E0 lb/TBtu or 6.0E-2 lb/GWh
b. Hydrogen chloride (HCl)2.0E-3 lb/MMBtu or 2.0E-2 lb/MWhFor Method 26A at appendix A-8 to part 60 of this chapter, collect a minimum of 0.75 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320 at appendix A to part 63 of this chapter, sample for a minimum of 1 hour.
OR
Sulfur dioxide (SO2) 42.0E-1 lb/MMBtu or 1.5E0 lb/MWhSO2 CEMS.
c. Mercury (Hg)1.2E0 lb/TBtu or 1.3E-2 lb/GWhLEE Testing for 30 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B at appendix A-8 to part 60 of this chapter run or Hg CEMS or sorbent trap monitoring system only.
OR
1.0E0 lb/TBtu or 1.1E-2 lb/GWhLEE Testing for 90 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B run or Hg CEMS or sorbent trap monitoring system only.
2. Coal-fired unit low rank virgin coala. Filterable particulate matter (PM)3.0E-2 lb/MMBtu or 3.0E-1 lb/MWh 2Before July 6, 2027: Collect a minimum of 1 dscm per run. On or after July 6, 2027: Collect a minimum catch of 6.0 milligrams or a minimum sample volume of 4 dscm per run if using PM CEMS for compliance demonstration. For all other compliance demonstration options, collect a minimum of 1 dscm per run.
OROR
Total non-Hg HAP metals5.0E-5 lb/MMBtu or 5.0E-1 lb/GWhCollect a minimum of 1 dscm per run.
OROR
Individual HAP metals:Collect a minimum of 3 dscm per run.
Antimony (Sb)8.0E-1 lb/TBtu or 8.0E-3 lb/GWh
Arsenic (As)1.1E0 lb/TBtu or 2.0E-2 lb/GWh
Beryllium (Be)2.0E-1 lb/TBtu or 2.0E-3 lb/GWh
Cadmium (Cd)3.0E-1 lb/TBtu or 3.0E-3 lb/GWh
Chromium (Cr)2.8E0 lb/TBtu or 3.0E-2 lb/GWh
Cobalt (Co)8.0E-1 lb/TBtu or 8.0E-3 lb/GWh
Lead (Pb)1.2E0 lb/TBtu or 2.0E-2 lb/GWh
Manganese (Mn)4.0E0 lb/TBtu or 5.0E-2 lb/GWh
Nickel (Ni)3.5E0 lb/TBtu or 4.0E-2 lb/GWh
Selenium (Se)5.0E0 lb/TBtu or 6.0E-2 lb/GWh
b. Hydrogen chloride (HCl)2.0E-3 lb/MMBtu or 2.0E-2 lb/MWhFor Method 26A, collect a minimum of 0.75 dscm per run; for Method 26 at appendix A-8 to part 60 of this chapter, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 1 hour.
OR
Sulfur dioxide (SO2) 42.0E-1 lb/MMBtu or 1.5E0 lb/MWhSO2 CEMS.
c. Mercury (Hg)4.0E0 lb/TBtu or 4.0E-2 lb/GWhLEE Testing for 30 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B run or Hg CEMS or sorbent trap monitoring system only.
3. IGCC unita. Filterable particulate matter (PM)4.0E-2 lb/MMBtu or 4.0E-1 lb/MWh 2Before July 6, 2027: Collect a minimum of 1 dscm per run. On or after July 6, 2027: Collect a minimum catch of 3.0 milligrams or a minimum sample volume of 2 dscm per run.
OROR
Total non-Hg HAP metals6.0E-5 lb/MMBtu or 5.0E-1 lb/GWhCollect a minimum of 1 dscm per run.
OROR
Individual HAP metals:Collect a minimum of 2 dscm per run.
Antimony (Sb)1.4E0 lb/TBtu or 2.0E-2 lb/GWh
Arsenic (As)1.5E0 lb/TBtu or 2.0E-2 lb/GWh
Beryllium (Be)1.0E-1 lb/TBtu or 1.0E-3 lb/GWh
Cadmium (Cd)1.5E-1 lb/TBtu or 2.0E-3 lb/GWh
Chromium (Cr)2.9E0 lb/TBtu or 3.0E-2 lb/GWh
Cobalt (Co)1.2E0 lb/TBtu or 2.0E-2 lb/GWh
Lead (Pb)1.9E+2 lb/TBtu or 1.8E0 lb/GWh
Manganese (Mn)2.5E0 lb/TBtu or 3.0E-2 lb/GWh
Nickel (Ni)6.5E0 lb/TBtu or 7.0E-2 lb/GWh
Selenium (Se)2.2E+1 lb/TBtu or 3.0E-1 lb/GWh
b. Hydrogen chloride (HCl)5.0E-4 lb/MMBtu or 5.0E-3 lb/MWhFor Method 26A, collect a minimum of 1 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 1 hour.
c. Mercury (Hg)2.5E0 lb/TBtu or 3.0E-2 lb/GWhLEE Testing for 30 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B run or Hg CEMS or sorbent trap monitoring system only.
4. Liquid oil-fired unit—continental (excluding limited-use liquid oil-fired subcategory units)a. Filterable particulate matter (PM)3.0E-2 lb/MMBtu or 3.0E-1 lb/MWh 2Collect a minimum of 1 dscm per run.
OROR
Total HAP metals8.0E-4 lb/MMBtu or 8.0E-3 lb/MWhCollect a minimum of 1 dscm per run.
OROR
Individual HAP metals:Collect a minimum of 1 dscm per run.
Antimony (Sb)1.3E+1 lb/TBtu or 2.0E-1 lb/GWh
Arsenic (As)2.8E0 lb/TBtu or 3.0E-2 lb/GWh
Beryllium (Be)2.0E-1 lb/TBtu or 2.0E-3 lb/GWh
Cadmium (Cd)3.0E-1 lb/TBtu or 2.0E-3 lb/GWh
Chromium (Cr)5.5E0 lb/TBtu or 6.0E-2 lb/GWh
Cobalt (Co)2.1E+1 lb/TBtu or 3.0E-1 lb/GWh
Lead (Pb)8.1E0 lb/TBtu or 8.0E-2 lb/GWh
Manganese (Mn)2.2E+1 lb/TBtu or 3.0E-1 lb/GWh
Nickel (Ni)1.1E+2 lb/TBtu or 1.1E0 lb/GWh
Selenium (Se)3.3E0 lb/TBtu or 4.0E-2 lb/GWh
Mercury (Hg)2.0E-1 lb/TBtu or 2.0E-3 lb/GWhFor Method 30B sample volume determination (Section 8.2.4), the estimated Hg concentration should nominally be <1⁄2 the standard.
b. Hydrogen chloride (HCl)2.0E-3 lb/MMBtu or 1.0E-2 lb/MWhFor Method 26A, collect a minimum of 1 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 1 hour.
c. Hydrogen fluoride (HF)4.0E-4 lb/MMBtu or 4.0E-3 lb/MWhFor Method 26A, collect a minimum of 1 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 1 hour.
5. Liquid oil-fired unit—non-continental (excluding limited-use liquid oil-fired subcategory units)a. Filterable particulate matter (PM)3.0E-2 lb/MMBtu or 3.0E-1 lb/MWh 2Collect a minimum of 1 dscm per run.
OROR
Total HAP metals6.0E-4 lb/MMBtu or 7.0E-3 lb/MWhCollect a minimum of 1 dscm per run.
OROR
Individual HAP metals:Collect a minimum of 2 dscm per run.
Antimony (Sb)2.2E0 lb/TBtu or 2.0E-2 lb/GWh
Arsenic (As)4.3E0 lb/TBtu or 8.0E-2 lb/GWh
Beryllium (Be)6.0E-1 lb/TBtu or 3.0E-3 lb/GWh
Cadmium (Cd)3.0E-1 lb/TBtu or 3.0E-3 lb/GWh
Chromium (Cr)3.1E+1 lb/TBtu or 3.0E-1 lb/GWh
Cobalt (Co)1.1E+2 lb/TBtu or 1.4E0 lb/GWh
Lead (Pb)4.9E0 lb/TBtu or 8.0E-2 lb/GWh
Manganese (Mn)2.0E+1 lb/TBtu or 3.0E-1 lb/GWh
Nickel (Ni)4.7E+2 lb/TBtu or 4.1E0 lb/GWh
Selenium (Se)9.8E0 lb/TBtu or 2.0E-1 lb/GWh
Mercury (Hg)4.0E-2 lb/TBtu or 4.0E-4 lb/GWhFor Method 30B sample volume determination (Section 8.2.4), the estimated Hg concentration should nominally be <1⁄2 the standard.
b. Hydrogen chloride (HCl)2.0E-4 lb/MMBtu or 2.0E-3 lb/MWhFor Method 26A, collect a minimum of 1 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 2 hours.
c. Hydrogen fluoride (HF)6.0E-5 lb/MMBtu or 5.0E-4 lb/MWhFor Method 26A, collect a minimum of 3 dscm per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 2 hours.
6. Solid oil-derived fuel-fired unita. Filterable particulate matter (PM)8.0E-3 lb/MMBtu or 9.0E-2 lb/MWh 2Before July 6, 2027: Collect a minimum of 1 dscm per run. On or after July 6, 2027: Collect a minimum catch of 6.0 milligrams or a minimum sample volume of 4 dscm per run if using PM CEMS for compliance. For all other compliance demonstration options, collect a minimum of 1 dscm per run.
OROR
Total non-Hg HAP metals4.0E-5 lb/MMBtu or 6.0E-1 lb/GWhCollect a minimum of 1 dscm per run.
OROR
Individual HAP metals:Collect a minimum of 3 dscm per run.
Antimony (Sb)8.0E-1 lb/TBtu or 7.0E-3 lb/GWh
Arsenic (As)3.0E-1 lb/TBtu or 5.0E-3 lb/GWh
Beryllium (Be)6.0E-2 lb/TBtu or 5.0E-4 lb/GWh
Cadmium (Cd)3.0E-1 lb/TBtu or 4.0E-3 lb/GWh
Chromium (Cr)8.0E-1 lb/TBtu or 2.0E-2 lb/GWh
Cobalt (Co)1.1E0 lb/TBtu or 2.0E-2 lb/GWh
Lead (Pb)8.0E-1 lb/TBtu or 2.0E-2 lb/GWh
Manganese (Mn)2.3E0 lb/TBtu or 4.0E-2 lb/GWh
Nickel (Ni)9.0E0 lb/TBtu or 2.0E-1 lb/GWh
Selenium (Se)1.2E0 lb/Tbtu or 2.0E-2 lb/GWh
b. Hydrogen chloride (HCl)5.0E-3 lb/MMBtu or 8.0E-2 lb/MWhFor Method 26A, collect a minimum of 0.75 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 1 hour.
OR
Sulfur dioxide (SO2) 43.0E-1 lb/MMBtu or 2.0E0 lb/MWhSO2 CEMS.
c. Mercury (Hg)2.0E-1 lb/TBtu or 2.0E-3 lb/GWhLEE Testing for 30 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B run or Hg CEMS or sorbent trap monitoring system only.
7. Eastern Bituminous Coal Refuse (EBCR)-fired unita. Filterable particulate matter (PM)3.0E-2 lb/MMBtu or 3.0E-1 lb/MWh 2Before July 6, 2027: Collect a minimum of 1 dscm per run. On or after July 6, 2027: Collect a minimum catch of 6.0 milligrams or a minimum sample volume of 4 dscm per run if using PM CEMS for compliance. For all other compliance demonstration options, collect a minimum of 1 dscm per run.
OROR
Total non-Hg HAP metals5.0E-5 lb/MMBtu or 5.0E-1 lb/GWhCollect a minimum of 1 dscm per run.
OROR
Individual HAP metals:Collect a minimum of 3 dscm per run.
Antimony (Sb)8.0E-1 lb/TBtu or 8.0E-3 lb/GWh
Arsenic (As)1.1E0 lb/TBtu or 2.0E-2 lb/GWh
Beryllium (Be)2.0E-1 lb/TBtu or 2.0E-3 lb/GWh
Cadmium (Cd)3.0E-1 lb/TBtu or 3.0E-3 lb/GWh
Chromium (Cr)2.8E0 lb/TBtu or 3.0E-2 lb/GWh
Cobalt (Co)8.0E-1 lb/TBtu or 8.0E-3 lb/GWh
Lead (Pb)1.2E0 lb/TBtu or 2.0E-2 lb/GWh
Manganese (Mn)4.0E0 lb/TBtu or 5.0E-2 lb/GWh
Nickel (Ni)3.5E0 lb/TBtu or 4.0E-2 lb/GWh
Selenium (Se)5.0E0 lb/TBtu or 6.0E-2 lb/GWh
b. Hydrogen chloride (HCl)4.0E-2 lb/MMBtu or 4.0E-1 lb/MWhFor Method 26A at appendix A-8 to part 60 of this chapter, collect a minimum of 0.75 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320 at appendix A to part 63 of this chapter, sample for a minimum of 1 hour.
OR
Sulfur dioxide (SO2) 46E-1 lb/MMBtu or 9E0 lb/MWhSO2 CEMS.
c. Mercury (Hg)1.2E0 lb/TBtu or 1.3E-2 lb/GWhLEE Testing for 30 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B at appendix A-8 to part 60 of this chapter run or Hg CEMS or sorbent trap monitoring system only.
OR
1.0E0 lb/TBtu or 1.1E-2 lb/GWhLEE Testing for 90 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B run or Hg CEMS or sorbent trap monitoring system only.
1 For LEE emissions testing for total PM, total HAP metals, individual HAP metals, HCl, and HF, the required minimum sampling volume must be increased nominally by a factor of 2.
2 Gross output.
3 Incorporated by reference, see § 63.14.
4 You may not use the alternate SO2 limit if your EGU does not have some form of FGD system and SO2 CEMS installed.

[85 FR 20850, Apr. 15, 2020, as amended at 89 FR 38571, May 7, 2024; 91 FR 9117, Feb. 24, 2026]