40 CFR § 62.15255 - May I deviate from the 13-month testing schedule if unforeseen circumstances arise?

---
identifier: "/us/cfr/t40/s62.15255"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 62.15255 - May I deviate from the 13-month testing schedule if unforeseen circumstances arise?"
title_number: 40
title_name: "Protection of Environment"
section_number: "62.15255"
section_name: "May I deviate from the 13-month testing schedule if unforeseen circumstances arise?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "62"
part_name: "APPROVAL AND PROMULGATION OF STATE PLANS FOR DESIGNATED FACILITIES AND POLLUTANTS"
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: "43 FR 51393, Nov. 3, 1978, unless otherwise noted."
cfr_part: "62"
---


# 62.15255 May I deviate from the 13-month testing schedule if unforeseen circumstances arise?

You may not deviate from the 13-month testing schedules specified in §§ 62.15240(b) and 62.15250(b)(1) unless you apply to the Administrator for an alternative schedule, and the Administrator approves your request for alternate scheduling prior to the date on which you would otherwise have been required to conduct the next stack test.