40 CFR § 63.6660 - In what form and how long must I keep my records?
---
identifier: "/us/cfr/t40/s63.6660"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 63.6660 - In what form and how long must I keep my records?"
title_number: 40
title_name: "Protection of Environment"
section_number: "63.6660"
section_name: "In what form and how long must I keep my records?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "63"
part_name: "NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "57 FR 61992, Dec. 29, 1992, unless otherwise noted."
cfr_part: "63"
---
# 63.6660 In what form and how long must I keep my records?
(a) Your records must be in a form suitable and readily available for expeditious review according to § 63.10(b)(1).
(b) As specified in § 63.10(b)(1), you must keep each record for 5 years following the date of each occurrence, measurement, maintenance, corrective action, report, or record.
(c) You must keep each record readily accessible in hard copy or electronic form for at least 5 years after the date of each occurrence, measurement, maintenance, corrective action, report, or record, according to § 63.10(b)(1).
[69 FR 33506, June 15, 2004, as amended at 75 FR 9678, Mar. 3, 2010]