40 CFR § 51.30 - When does my state report which emissions data to EPA?

---
identifier: "/us/cfr/t40/s51.30"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 51.30 - When does my state report which emissions data to EPA?"
title_number: 40
title_name: "Protection of Environment"
section_number: "51.30"
section_name: "When does my state report which emissions data to EPA?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "51"
part_name: "REQUIREMENTS FOR PREPARATION, ADOPTION, AND SUBMITTAL OF IMPLEMENTATION PLANS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "23 U.S.C. 101; 42 U.S.C. 7401-7671q."
regulatory_source: "36 FR 22398, Nov. 25, 1971, unless otherwise noted."
cfr_part: "51"
---


# 51.30 When does my state report which emissions data to EPA?

All states are required to report two basic types of emission inventories to the EPA: An every-year inventory; and a triennial inventory.

(a) *Every-year inventory.* See Tables 2a and 2b of Appendix A of this subpart for the specific data elements to report every year.

(1) All states are required to report every year the annual (12-month) emissions data described in § 51.15 from Type A (large) point sources, as defined in Table 1 of Appendix A of this subpart. The first every-year cycle inventory will be for the 2009 inventory year and must be submitted to the EPA within 12 months, *i.e.,* by December 31, 2010.

(2) In inventory years that fall under the triennial inventory requirements, the reporting required by the triennial inventory satisfies the every-year reporting requirements of paragraph (a) of this section.

(b) *Triennial inventory.* See Tables 2a and 2b to Appendix A of subpart A for the specific data elements that must be reported for the triennial inventories.

(1) All states are required to report for every third inventory year the annual (12-month) emissions data as described in § 51.15. The first triennial inventory will be for the 2011 inventory and must be submitted to the EPA within 12 months, *i.e.,* by December 31, 2012. Subsequent triennial inventories (2014, 2017, etc.) will be due 12 months after the end of the inventory year, *i.e.,* by December 31 of the following year.

(2) [Reserved]

[80 FR 8796, Feb. 19, 2015]