delivered the opinion of the Court.
We consider whether § 7002 of the Resource Conservation and Recovery Act of 1976 (RCRA), 42 U. S. C. § 6972, authorizes a private cause of action to recover the prior cost of cleaning up toxic waste that does not, at the time of suit, continue to pose an endangerment to health or the environment. We conclude that it does not.
I
Respondent KFC Western, Inc. (KFC), owns and operates a “Kentucky Fried Chicken” restaurant on a parcel of property in Los Angeles. In 1988, KFC discovered during the course of a construction project that the property was contaminated with petroleum. The County of Los Angeles Department of Health Services ordered KFC to attend to the problem, and KFC spent $211,000 removing and disposing of the oil-tainted soil.
Three years later, KFC brought this suit under the citizen suit provision of RCRA, 90 Stat. 2825, as amended, 42 *482 U. S. C. § 6972(a), * seeking to recover these cleanup costs from petitioners Alan and Margaret Meghrig.
KFC claimed that the contaminated soil was a “solid waste” covered by RCRA, see 42 U. S. C. § 6903(27), that it had previously posed an “imminent and substantial endangerment to health or the environment,” see § 6972(a)(1)(B), and that the Meghrigs were responsible for “equitable restitution” of KFC’s cleanup costs under § 6972(a) because, as prior owners of the property, they had contributed to the waste’s “past or present handling, storage, treatment, transportation, or disposal.” See App. 12-19 (first amended complaint).
The District Court held that § 6972(a) does not permit recovery of past cleanup costs and that § 6972(a)(1)(B) does not authorize a cause of action for the remediation of toxic waste that does not pose an “imminent and substantial endangerment to health or the environment” at the time suit is filed, and dismissed KFC’s complaint. App. to Pet. for Cert. A21-A23. The Court of Appeals for the Ninth Circuit reversed, over a dissent,
The Ninth Circuit’s conclusion regarding the remedies available under RCRA conflicts with the decision of the Court of Appeals for the Eighth Circuit in
Furrer
v.
Brown,
II
RCRA is a comprehensive environmental statute that governs the treatment, storage, and disposal of solid and hazardous waste. See
Chicago
v.
Environmental Defense Fund,
Chief responsibility for the implementation and enforcement of RCRA rests with the Administrator of the Environ *484 mental Protection Agency (EPA), see §§6928, 6973, but like other environmental laws, RCRA contains a citizen suit provision, §6972, which permits private citizens to enforce its provisions in some circumstances.
Two requirements of § 6972(a) defeat KFC’s suit against the Meghrigs. The first concerns the necessary timing of a citizen suit brought under § 6972(a)(1)(B): That section permits a private party to bring suit against certain responsible persons, including former owners, “who ha[ve] contributed or who [are] contributing to the past or present handling, storage, treatment, transportation, or disposal of any solid or hazardous waste which may present an imminent and substantial endangerment to health or the environment.” (Emphasis added.) The second defines the remedies a district court can award in a suit brought under § 6972(a)(1)(B): Section 6972(a) authorizes district courts “to restrain any person who has contributed or who is contributing to the past or present handling, storage, treatment, transportation, or disposal of any solid or hazardous waste ... , to order such person to take such other action as may be necessary, or both.” (Emphasis added.)
It is apparent from the two remedies described in § 6972(a) that RCRA’s citizen suit provision is not directed at providing compensation for past cleanup efforts. Under a plain reading of this remedial scheme, a private citizen suing under § 6972(a)(1)(B) could seek a mandatory injunction, i. e., one that orders a responsible party to “take action” by attending to the cleanup and proper disposal of toxic waste, or a prohibitory injunction, i. e., one that “restrains” a responsible party from further violating RCRA. Neither remedy, however, is susceptible of the interpretation adopted by the Ninth Circuit, as neither contemplates the award of past cleanup costs, whether these are denominated “damages” or “equitable restitution.”
In this regard, a comparison between the relief available under RCRA’s citizen suit provision and that which Congress *485 has provided in the analogous, but not parallel, provisions of CERCLA is telling. CERCLA was passed several years after RCRA went into effect, and it is designed to address many of the same toxic waste problems that inspired the passage of RCRA. Compare 42 U. S. C. § 6903(5) (RCRA definition of “hazardous waste”) and §6903(27) (RCRA definition of “solid waste”) with § 9601(14) (CERCLA provision incorporating certain “hazardous substance[s],” but specifically excluding petroleum). CERCLA differs markedly from RCRA, however, in the remedies it provides. CERCLA’s citizen suit provision mimics § 6972(a) in providing district courts with the authority “to order such action as may be necessary to correct the violation” of any CERCLA standard or regulation. 42 U. S. C. § 9659(c). But CERCLA expressly permits the Government to recover “all costs of removal or remedial action,” § 9607(a)(4)(A), and it expressly permits the recovery of any “necessary costs of response, incurred by any . . . person consistent with the national contingency plan,” § 9607(a)(4)(B). CERCLA also provides that “[a]ny person may seek contribution from any other person who is liable or potentially liable” for these response costs. See § 9613(f)(1). Congress thus demonstrated in CERCLA that it knew how to provide for the recovery of cleanup costs, and that the language used to define the remedies under RCRA does not provide that remedy.
That RCRA’s citizen suit provision was not intended to provide a remedy for past cleanup costs is further apparent from the harm at which it is directed. Section 6972(a)(1)(B) permits a private party to bring suit only upon a showing that the solid or hazardous waste at issue “may present an imminent and substantial endangerment to health or the environment.” The meaning of this timing restriction is plain: An endangerment can only be “imminent” if it “threaten[s] to occur immediately,” Webster’s New International Dictionary of English Language 1245 (2d ed. 1934), and the refer
*486
ence to waste which “may present” imminent harm quite clearly excludes waste that no longer presents such a danger. As the Ninth Circuit itself intimated in
Price
v.
United States Navy,
Other aspects of RCRA’s enforcement scheme strongly support this conclusion. Unlike CERCLA, RCRA contains no statute of limitations, compare § 9613(g)(2) (limitations period in suits under CERCLA § 9607), and it does not require a showing that the response costs being sought are reasonable, compare §§ 9607(a)(4)(A) and (B) (costs recovered under CERCLA must be “consistent with the national contingency plan”). If Congress had intended § 6972(a) to function as a cost-recovery mechanism, the absence of these provisions would be striking. Moreover, with one limited exception, see
Hallstrom
v.
Tillamook County,
Though it agrees that KFC’s complaint is defective for failing properly to allege an “imminent and substantial endanger ment,” the Government (as amicus) nonetheless joins KFC in arguing that § 6972(a) does not in all circumstances preclude, an award of past cleanup costs. See Brief for United States as
Amicus Curiae
22-28. The Government posits a situation in which suit is properly brought while the waste at issue continues to pose an imminent endangerment, and suggests that the plaintiff in such a case could seek equitable restitution of money previously spent on cleanup efforts. Echoing a similar argument made by KFC, see Brief for Respondent 11-19, the Government does not rely on the remedies expressly provided in § 6972(a), but rather cites a line of cases holding that district courts retain inherent authority to award any equitable remedy that is not expressly taken away from them by Congress. See,
e. g., Porter
v.
Warner Holding Co.,
RCRA does not prevent a private party from recovering its cleanup costs under other federal or state laws, see § 6972(f) (preserving remedies under statutory and common law), but the limited remedies described in § 6972(a), along with the stark differences between the language of that section and the cost recovery provisions of CERCLA, amply demonstrate that Congress did not intend for a private citizen to be able to undertake a cleanup and then proceed to recover its costs under RCRA. As we explained in
Middle-sex County Sewerage Authority
v.
National Sea Clammers Assn.,
Without considering whether a private party could seek to obtain an injunction requiring another party to pay cleanup costs which arise after a RCRA citizen suit has been properly commenced, cf.
United States
v.
Price,
It is so ordered.
Notes
Section 6972(a) provides, in relevant part:
“Except as provided in subsection (b) or (c) of this section, any person may commence a civil action on his own behalf—
“(1)(B) against any person, including . .. any past or present generator, past or present transporter, or past or present owner or operator of a treatment, storage, or disposal facility, who has contributed or who is contributing to the past or present handling, storage, treatment, transportation, or disposal of any solid or hazardous waste which may present an imminent and substantial endangerment to health or the environment....
“. . . The district court shall have jurisdiction ... to restrain any person who has contributed or who is contributing to the past or present handling, storage, treatment, transportation, or disposal of any solid or hazardous waste referred to in paragraph (1)(B), to order such person to take such other action as may be necessary, or both ....”
