Opinion for the Court filed by Circuit Judge ROGERS.
The General Motors Corporation (“GM”) petitions for review of May 7, 2002 letters from an enforcement official at the Environmental Protection Agency (“EPA”) regarding nascent enforcement actions based on a regulatory interpretation that automobile manufacturing paint purge solvents are “solid waste” under the Resource Conservation and Recovery Act of 1976 (“RCRA”), 42 U.S.C. §§ 6901 et seq., upon exiting the spray painting unit. We dismiss GM’s petition for lack of jurisdiction.
I.
A.
Subtitle C of RCRA,
see
42 U.S.C. §§ 6921-6939e, “establishes a ‘cradle to grave’ federal regulatory system for the treatment, storage, and disposal of hazardous wastes.”
American Portland Cement Alliance v. EPA,
Under RCRA, EPA has broad investigatory and enforcement authority. EPA may require hazardous waste facilities to disclose particular information, id. § 6927, or to monitor and test for hazardous waste, id. § 6934, and EPA may inspect such facilities. Id. § 6927. Upon discovery of RCRA violations, EPA engages in pre-enforcement action by issuing an inspection report or a notice of violation to the facility. See id. §§ 6927, 6928. The facility may be afforded an opportunity to show cause why EPA should not proceed with an enforcement action. Absent such opportunity, or if EPA is unconvinced by the facility’s showing, EPA can commence an enforcement action by filing an administrative complaint alleging violations of Subtitle C requirements and proposing a compliance order, suspension or revocation of the facility’s permit, and a penalty. See id. § 6928(a); 40 C.F.R. Parts 22, 24. The owner or operator of the cited facility is *445 entitled to a hearing before an administrative law judge, and upon an adverse decision, may appeal to the Environmental Appeals Board (“Board”). See 42 U.S.C. § 6928(b); 40 C.F.R. § 22.4. The Board’s decision, as the final EPA decision, is judicially reviewable. See 42 U.S.C. § 6928(b); 40 C.F.R. §§ 22.27(d), 22.31. Alternatively, EPA can file a complaint directly in the federal district court for injunctive or other appropriate relief, see 42 U.S.C. § 6928(a),(h); 40 C.F.R. Parts 22, 24, including, in certain instances, fines and imprisonment. See 42 U.S.C. § 6928(d).
B.
The underlying dispute between EPA and GM and the amici concerns the point of generation of RCRA “solid waste” in the automobile manufacturing industry’s paint purge solvent processes. Shortly after the effective date of the Subparts BB and CC requirements, by letter of July 29, 1997, Elizabeth Cotsworth, the Acting Director of the EPA Office of Solid Waste, 1 responded to a letter from an attorney representing an unnamed client that uses solvents to clean automated spray painting guns when changing paint color. 2 The Cotsworth letter stated that, based on the system described, “the used solvent is waste once its leaves the spray painting unit, and [thus] ... the equalization tank and associated piping are subject to hazardous waste regulatory requirements.” After stating this “general interpretation of the federal regulations,” the Cotsworth letter also advised that the “authorized state agency is responsible for interpreting its own regulations and making site specific regulatory determinations.” In July 1998, EPA issued a copy of the Cotsworth letter as a supplement to the RCRA Permit Policy Compendium, which became available online to the regulated public in September 1998 on the RCRA website (hereinafter “RCRA Policy Compendium”).
Beginning in 1998, EPA issued notices of violations, based on inspection reports, to several automobile manufacturing facilities, including GM plants in Doraville, Georgia and Kansas City, Kansas, as well as the Ford Motor Company’s (“Ford”) Avon Lake, Ohio plant, for failure to assure that the solvent piping systems used to convey purge solvents to solvent recovery tanks met the requirements under RCRA Subtitle C. In September 1999, EPA filed an administrative complaint against Ford for failure to comply with the requirements under Subparts J, BB, and CC of the regulations, alleging that “[h]az-ardous waste is generated at the Facility when paint lines and equipment are cleaned with solvents.” The following year EPA issued a notice of violation to the Toyota Motor Manufacturing plant in Princeton, Indiana. Similar notices of RCRA violations were issued by EPA in July 2001 to the BMW Manufacturing Corporation (“BMW”) plant in Spartanburg County, South Carolina, and in February and November 2001 to GM’s plants in Linden, New Jersey and Bowling Green, Kentucky. EPA invited GM’s Bowling Green plant “to show cause why EPA should not take formal enforcement action against GM pursuant to” § 3008(a) of RCRA, 42 U.S.C. § 6928(a).
By letter of March 10, 2000, the Alliance of Automobile Manufacturers (“AAM”), which had been in discussions with EPA officials about EPA’s enforcement initia *446 tive, expressed “concern[ ] about recent interpretations applying BB and/or CC requirements to [the automobile industry’s] paint and purge processes.” 3 AAM claimed that the interpretation in the Cots-worth letter was based on an incomplete picture of such processes. Urging a categorical position that the automotive manufacturing “painting system is a process that includes the use of purge solvent throughout the process,” AAM argued that the point of generation of “solid waste” does not occur until the solvent is discarded when it exits that process upon reaching the solvent recovery tank. Further, by letter of July 3, 2001, AAM claimed that “EPA’s recent enforcement actions represent an entirely new interpretation of the RCRA requirements,” and that “[s]uch changes in regulatory interpretation and policy should be addressed on their merits before enforcement actions are undertaken.” 4 AAM therefore requested that “EPA place a ‘hold’ on RCRA enforcement proceedings relating to automotive solvent recovery systems.” Letters from the governors of several states and their environmental officials also expressed concern about the Cotsworth interpretation and its application at specific plants.
In response to AAM’s letters and inquires from two automobile manufacturers, Eric V. Schaeffer, the Director of Regulatory Enforcement, 5 wrote on August 31, 2001, that the applicability of Subparts J and BB to piping systems conveying solvents from spray painting units “is quite clear.” The Schaeffer letter advised that EPA “has consistently articulated [this] viewpoint,” referencing the RCRA Policy Compendium. Indicating that EPA was willing, if there was data to support AAM’s categorical position, to “consider revising the rule in light of [industry’s] viewpoint that the requirements offer no environmental benefit,” the Schaeffer letter advised that members of the industry still must “resolve liability for past violations,” and urged resolution of compliance issues on a multi-facility basis.
AAM responded by letter of September 7, 2001, that it welcomed a meeting to focus on “needed environmental policy changes,” and that it would provide information to “demonstrate that EPA’s current regulatory interpretation — and the corresponding enforcement initiative — do not stand to produce environmental benefits.” 6 AAM cautioned, however, that “[i]n this case, ... a regulatory change may not be the most cost-effective or innovative approach.” Seven months later, by letter of April 23, 2002, AAM wrote to three EPA Administrators, including Steven Shimberg, the Associate Assistant Administrator of the EPA Office of Enforcement and Compliance, in order to “bring[ ] to a conclusion our continuing efforts to resolve the issue of purge solvent regulation in the automobile industry,” and to present EPA with “a comprehensive resolution” in response to EPA’s proposal of a consent agreement without regulatory change that *447 included fines to recoup the economic benefit of noncompliance. 7
On May 7, 2002, Steven Shimberg of the Office of Enforcement and Compliance wrote to AAM and several of its members, including GM (hereinafter “the Shimberg letters”). The Shimberg letter to GM stated in relevant part:
The EPA continues to stand by its’ 1997 determination on the point of generation for hazardous waste at spray paint operations and, as such, ancillary equipment transporting the hazardous waste purge solvent from the painting operations and the storage tanks to which the mixture is conveyed are subject to RCRA.... The Agency has spent considerable time and resources listening to and reviewing information presented by members of the automobile industry before reaching its position on the issues. In the hope that there is still a possibility to negotiate a settlement with individual members of the industry, I would like to reaffirm the settlement offer and acknowledge a change in one of the terms that is designed to address the industry’s concern with the compliance deadline for ... Subpart BB.... For any member of the industry that does not wish to discuss the settlement offer, EPA will proceed with conventional inspections and enforcement. 8
The Shimberg letter to AAM similarly stated that EPA disagreed with AAM’s categorical critique of its enforcement initiative, that “EPA continues to stand by its’ 1997 determination on the point of generation for hazardous waste at spray paint operations,” and that the enforcement matters should proceed and be resolved through settlements or adjudications involving individual manufacturers. 9
The EPA Office of Enforcement and Compliance Assurance sent an email on May 9, 2002 to Regions I-X that included a copy of the Shimberg letters. Following federal and state inspections, EPA issued, on May 31 and August 2, 2002, inspection reports to GM and notified GM of RCRA violations relating to the purge solvent piping systems at its plants in Spring Hill, Tennessee and Doraville, Georgia. EPA directed the Spring Hill facility to correct the violations and advised the Georgia Department of Natural Resources that EPA had classified the Doraville plant as a “significant non-Complier.”
GM filed a petition in this court on August 2, 2002 for review of EPA’s “final agency action ... regarding the RCRA classification of purge solvents in the automobile manufacturing industry, as expressed in a May 7, 2002 letter from EPA to the [AAM] ... and separately in a similar letter sent on May 7, 2002 to GM.” GM, joined by
amici,
contend in their briefs that EPA’s attempt in the Shimberg letters to regulate purge solvent piping systems unlawfully expands EPA’s RCRA jurisdiction based on a novel characterization of purge solvents that ignores their performance of solvent functions after cleaning the spray painting unit. EPA
*448
filed a motion on October 21, 2002, to dismiss GM’s petition for lack of jurisdiction. While rejecting the attack on the applicability of Subtitle C to purge solvent piping systems, EPA repeats in its brief that, as a threshold matter, the court lacks jurisdiction because the Shimberg letters are not regulations reviewable under RCRA § 7006(a), 42 U.S.C. § 6976(a), GM lacks standing, and GM’s petition is untimely or unripe. As a court of limited jurisdiction, we begin, and end, with an examination of our jurisdiction.
See Utility Air Regulatory Group v. EPA,
II.
Section 7006(a)(1) of RCRA, 42 U.S.C. § 6976(a)(1), limits the jurisdiction of the court to review of “action of the Administrator in promulgating any regulation, or requirement under this chapter or denying any petition for the promulgation, amendment or repeal of any regulation under this chapter.” Hence, the court has jurisdiction over “only final regulations, requirements, and denials of petitions to promulgate, amend or repeal a regulation.”
Molycorp, Inc. v. EPA,
In several recent opinions, the court has had occasion to address 'what type of EPA action is judicially reviewable, eschewing the notion that labels are definitive. Thus, in
General Electric,
If an agency acts as if a document issued at headquarters is controlling in the field, if it treats the document in the same manner as it treats a legislative rule, if it bases enforcement actions on the policies or interpretations formulated in the document, if it leads private parties or State permitting authorities to believe that it will declare permits invalid unless they comply with the terms of the document, then the agency’s document is for all practical purposes “binding.”
GM seeks to bring the Shimberg letters within the folds of Appalachian Power and CropLife on either of two theories of finality. First, GM contends, because the regulatory status of paint purge solvents was an unresolved question that industry had discussed with EPA for several years, the interpretation in the Shimberg letters was a crystallization of EPA’s position. Second, GM contends, even if EPA had previously resolved the solvents’ regulatory status, EPA reopened the issue and renewed its adherence to its earlier interpretation in the Shimberg letters. Under either theory, GM contends that the text of the Shimberg letters “is unequivocal that EPA’s decision on the regulatory status of purge solvents is final and that EPA intends it to be binding.” Petitioner’s Br. at 30. The Shimberg letters are binding in the field GM claims, as evidenced both by the May 9, 2002 email to the Regions attaching the Shimberg letters, and by the Guidance issued to the Regions at the end of 2002 after GM filed its petition for review. 10 Additionally, as evidenced by the subsequent enforcement actions against GM plants, GM maintains “EPA is explicitly basing enforcement action on the [regulatory] interpretation formulated in the [Shimberg letters].” Id. at 31 (internal quotation marks omitted). GM therefore contends that EPA, in order to regulate purge solvent piping systems, attempted to amend the RCRA regulations through the Shimberg letters without providing notice and comment as required by the Administrative Procedure Act, see 5 U.S.C. § 553, and thus its action is unlawful.
Contrary to GM’s theory, the Shimberg letters cannot accurately be characterized as the culmination of EPA’s position on the applicability of Subparts J, BB, and CC to purge solvent piping systems. The Shimberg letters reflect neither a new interpretation nor a new policy.
See General Electric,
Under GM’s alternative theory, EPA reopened the paint purge solvent issue by making itself available in response to industry’s requests to discuss nascent enforcement matters in light of industry data relevant to the point of generation of RCRA “solid waste,” and thereby caused the 90-day period for judicial review to run anew. 42 U.S.C. § 6976(a)(1). Again, GM mischaracterizes EPA’s conduct. The rationale of the reopening doctrine is not to stifle informal communications between agencies and the regulated industry.
See Am. Iron & Steel Inst. v. EPA,
Viewed in their enforcement context, then, the Shimberg letters are not reviewable as final agency action under RCRA § 7006(a). “No legal consequences flow from [the Shimberg letters] ..., for there has been no order compelling [GM] to do anything.”
Reliable Automatic Sprinkler Co. v. Consumer Prod. Safety Comm’n,
Because nothing in the record indicates that the Shimberg letters imposed new requirements on regulated parties or exclusively guided EPA’s subsequent enforcement activities, GM misreads the Shimberg letters in maintaining that they set forth an unequivocal final and binding new interpretation or renewed interpretation. All of the documents cited by GM and
amici
to demonstrate the impact of the Shimberg letters show only that: (1) EPA enforcement personnel have found, since the late 1990s, both before and after the Shimberg letters, that based on the regulatory interpretation in the RCRA Permit Policy Compendium, the statutory and regulatory requirements, and site-specific inspections, purge solvent piping systems are subject to RCRA Subtitle C at some automobile manufacturing facilities; and (2) some states appear to agree generally with GM and
amici
that automotive purge solvent piping systems categorically are not subject to RCRA Subtitle C regulation. By attaching the Shimberg letters to an email to the field on May 9, 2002, EPA did not impose new obligations in the field; rather, it did no more than state the obligations set forth in the RCRA Policy Compendium.
Cf. Appalachian Power,
Moreover, to the extent that GM’s petition challenges the regulatory interpretation in the Shimberg letters the challenge is untimely. That interpretation, which EPA relied on in issuing notices of violations to GM and other automobile manufacturers, was set forth in the RCRA Policy Compendium. Although the interpretation was not published in the Federal Register,
see Florida Power,
Furthermore, to the extent GM’s petition challenges the application of EPA’s regulatory interpretation to GM plants, the challenge is unripe. Under the two part test in
Abbott Labs. v. Gardner,
*453
Under the circumstances, “[i]t is difficult to understand why this case was brought to the court at this time.”
Molycorp,
Notes
. Letter from Elizabeth Cotsworth, Acting Director, Office of Solid Waste, EPA, to Jill A. Weller, Thompson, Hiñe & Flory, P.L.L. (July 29, 1997).
. Letter from Jill A. Weller, Thompson, Hine & Flory, P.L.L., to Timothy Fields, Jr., Acting Assistant Administrator, Office of Solid Waste, EPA (June 16, 1997).
. Letter from Julie C. Becker, Assistant General Counsel, AAM (hereinafter "AAM Becker”), to David Eberly, Office of Solid Waste Permits & State Programs Branch, EPA (Mar. 10, 2000),
. Letter from AAM Becker, to Matthew Hale, Jr., Deputy Director, Office of Solid Waste, EPA (July 3, 2001).
. Letter from Eric V. Schaeffer, Director of Office of Regulatory Enforcement, EPA, to Gary Weinrich, Manager, BMW Manufacturing Corp., W. Charles Moeser, Sr. Manager, DaimlerChrysler Corp., and AAM Becker (Aug. 31, 2001) (hereinafter "Schaeffer letter”).
. Letter from AAM Becker, to Eric V. Schaef-fer, Director of Office of Regulatory Enforcement, EPA (Sept. 7, 2001).
.Letter from Gregory Dana, Vice President of Environmental Affairs, AAM and AAM Becker, to Marianne Lamont Horinko, Assistant Administrator, Office of Solid Waste and Emergency Response, EPA, Steven Shimberg, Associate Assistant Administrator, Office of Enforcement and Compliance, EPA, and Thomas J. Gibson, Associate Administrator, Office of Policy, Economics, and Innovation, EPA (Apr. 23, 2002).
. Letter from Steven Shimberg, to Patrick J. McCarroll, Legal Staff, General Motors Corp. (May 7, 2002).
. Letter from Steven Shimberg, to Gregory Dana, Vice President of Environmental Affairs, AAM, and AAM Becker (May 7, 2002).
. See “Guidance on RCRA Subpart J Secondary Containment Requirements at Automobile Spray Painting Operations” (Nov. 18, 2002), and “Supplemental Guidance on RCRA Subparl J Secondary Containment Requirements at Automobile Spray Painting Operations” (Dec. 12, 2002) (hereafter “2002 Guidance”).
. Letter from Phyllis P. Harris, Principal Deputy Assistant Administrator, Office of Enforcement and Compliance Assurance, EPA, to R. Lewis Shaw, Deputy Commissioner, Environmental Quality Control, South Carolina Department of Health & Environmental Control (Nov. 5, 2002).
