delivered the opinion of the Court.

The United States seeks review of a decision of the United States Court of Appeals for the Tenth Circuit that a proceeding for the assessment of a “civil penalty” under § 311 (b) (6) of the Federal Water Pollution Control Act (FWPCA) is a “criminal case” within the meaning of the Fifth Amendment’s guarantee against compulsory self-incrimination. We granted certiorari, 444 U. S. 939, and now reverse.

I

At the time this case arose,^[1] § 311 (b) (3) of the FWPCA prohibited the discharge into navigable waters or onto adjoining shorelines of oil or hazardous substances in quantities determined by the President to be “harmful.” ^[2] Section 311 (b) (5) of the Act imposed a duty upon “any person in charge of a vessel or of an onshore facility or an offshore facility” to report any discharge of oil or a hazardous substance into navigable waters to the “appropriate agency” of the United States Government. Should that person fail to supply such notification, he or she was liable to a fine of not more than $10,000 or imprisonment of not more than one year. Section 311 (b)(5) also provided for a form of “use immunity,” specifying that “[notification received pursuant to this paragraph or information obtained by the exploitation of such notification shall not be used against any such person in any criminal case, except a prosecution for perjury or for giving a false statement.” 33 U. S. C. § 1321 (b)(5).^[3]

[*245] Section 311 (b) (6) provided for the imposition of a “civil penalty” against “[a]ny owner or operator of any vessel, onshore facility, or offshore facility from which oil or a hazardous substance is discharged in violation” of the Act. In 1975, that subsection called for a penalty of up to $5,000 for each violation of the Act.^[4] In assessing penalties, the Secretary of the appropriate agency was to take into account “the appropriateness of such penalty to the size of the business or of the owner or operator charged, the effect on the owner or operator’s ability to continue in business, and the gravity of the violation. . . .” 33 TJ. S. C. § 1321 (b)(6).^[5]

[*246] According to § 311 (k) of the Act, funds collected from the assessment of penalties under § 311 (b) (6) were to be paid into a “revolving fund” together with “other funds received . . . under this section” and any money appropriated to the revolving fund by Congress. See 33 U. S. C. § 1321 (k). Money contained in this fund was to be used to finance the removal, containment, or dispersal of oil and hazardous substances discharged into navigable waters and to defray the costs of administering the Act. 33 U. S. C. § 1321 (?). Another section of the Act allowed the United States Government to collect the costs of removal, containment, or dispersal of a discharge from the person or corporation responsible for that discharge in cases where that person or corporation had been identified. 33 U. S. C. § 1321 (f).

On or about March 23, 1975, oil escaped from an oil retention pit at a drilling facility located near Enid, Okla., and eventually found its way into Boggie Creek, a tributary of the Arkansas River system.^[6] At the time of the discharge, the premises were being leased by respondent L. 0. Ward, who was doing business as L. 0. Ward Oil & Gas Operations. On April 2, 1975, respondent Ward notified the regional office of the Environmental Protection Agency (EPA) that a discharge of oil had taken place. Ward later submitted a more complete written report of the discharge, which was in turn forwarded to the Coast Guard, the agency responsible for assessing civil penalties under §311 (b)(6).

After notice and opportunity for hearing, the Coast Guard assessed a civil penalty against respondent in the amount[*247] of $500. Respondent filed an administrative appeal from this ruling, contending, inter alia, that the reporting requirements of § 311 (b)(5) of the Act violated his privilege against compulsory self-incrimination. The administrative appeal was denied.

On April 13, 1976, Ward filed suit in the United States District Court for the Western District of Oklahoma, seeking to enjoin the Secretary of Transportation, the Commandant of the Coast Guard, and the Administrator of EPA from enforcing §§ 311 (b)(5) and (6) and from collecting the penalty of $500. On June 4, 1976, the United States filed a separate suit in the same court to collect the unpaid penalty. The District Court eventually ordered the two suits consolidated for trial.

Prior to trial, the District Court rejected Ward’s contention that the reporting requirements of §311 (b)(5), as used to support ¿ civil penalty under § 311 (b)(6), violated his right against compulsory self-incrimination. The case was tried to a jury, which found that Ward’s facility did, in fact, spill oil into Boggie Creek. The District Court, however, reduced Ward’s penalty to $250 because of the amount of oil that had spilled and because of its belief that Ward had been diligent in his attempts to clean up the discharge after it had been discovered.

The United States Court of Appeals for the Tenth Circuit reversed. Ward v. Coleman, 598 F. 2d 1187 (1979). Although admitting that Congress had labeled the penalty provided for in § 311 (b)(6) as civil and that the use of funds collected under that section to finance the administration of the Act indicated a “remedial” purpose for the provision, the Court of Appeals tested the statutory scheme against the standards set forth in Kennedy v. Mendoza-Martinez, 372 U. S. 144, 168-169 (1963),^[7] and held that §311 (b)(6) was sufficiently[*248] punitive to intrude upon the Fifth Amendment’s protections against compulsory self-incrimination. It therefore reversed and remanded for further proceedings in the collection suit.

II

The distinction between a civil penalty and a criminal penalty is of some constitutional import. The Self-Incrimination Clause of the Fifth Amendment, for example, is expressly limited to “any criminal case.” Similarly, the protections provided by the Sixth Amendment are available only in “criminal prosecutions.” Other constitutional protections, while not explicitly limited to one context or the other, have been so limited by decision of this Court. See, e. g., Helvering v. Mitchell, 303 U. S. 391, 399 (1938) (Double Jeopardy Clause protects only against two criminal punishments); United States v. Regan, 232 U. S. 37, 47-48 (1914) (proof beyond a reasonable doubt required only in criminal cases).

This Court has often stated that the question whether a particular statutorily defined penalty is civil or criminal is a matter of statutory construction. See, e. g., One Lot Emerald Cut Stones v. United States, 409 U. S. 232, 237 (1972); Helvering v. Mitchell, supra, at 399. Our inquiry in this regard has traditionally proceeded on two levels. First, we have set out to determine whether Congress, in establishing the penalizing mechanism, indicated either expressly or impliedly a preference for one label or the other. See One Lot Emerald Cut Stones v. United States, supra, at 236-237. Second, where Congress has indicated an intention to establish a civil penalty, we have inquired further whether the statu[*249]tory scheme was so punitive either in purpose or effect as to negate that intention. See Flemming v. Nestor, 363 U. S. 603, 617-621 (1960). In regard to this latter inquiry, we have noted that “only the clearest proof could suffice to establish the unconstitutionality of a statute on such a ground.” Id., at 617. See also One Lot Emerald Cut Stones v. United States, supra, at 237; Rex Trailer Co. v. United States, 350 U. S. 148, 154 (1956).

As for our first inquiry in the present case, we believe it quite clear that Congress intended to impose a civil penalty upon persons in Ward’s position. Initially, and importantly, Congress labeled the sanction authorized in §311 (b)(6) a “civil penalty,” a label that takes on added significance given its juxtaposition with the criminal penalties set forth in the immediately preceding subparagraph, § 311 (b) (5). Thus, we have no doubt that Congress intended to allow imposition of penalties under § 311 (b) (6) without regard to the procedural protections and restrictions available in criminal prosecutions.

We turn then to consider whether Congress, despite its manifest intention to establish a civil, remedial mechanism, nevertheless provided for sanctions so punitive as to “trans-for[m] what was clearly intended as a civil remedy into a criminal penalty.” Rex Trailer Co. v. United States, supra, at 154. In making this determination, both the District Court and the Court of Appeals found it useful to refer to the seven considerations listed in Kennedy v. Mendoza-Martinez, supra, at 168-169. This list of considerations, while certainly neither exhaustive nor dispositive, has proved helpful in our own consideration of similar questions, see, e. g., Bell v. Wolfish, 441 U. S. 520, 537-538 (1979), and provides some guidance in the present case.

Without setting forth here our assessment of each of the seven Mendoza-Martinez factors, we think only one, the fifth, aids respondent. That is a consideration of whether “the[*250] behavior to which [the penalty] applies is already a crime.” 372 U. S., at 168-169. In this regard, respondent contends that § 13 of the Rivers and Harbors Appropriation Act of 1899, 33 U. S. C. § 407, makes criminal the precise conduct penalized in the present case. Moreover, respondent points out that at least one federal court has held that § 13 of the Rivers and Harbors Appropriation Act defines a “strict liability crime,” for which the Government need prove no scienter. See United States v. White Fuel Corp., 498 F. 2d 619 (CA1 1974). According to respondent, this confirms the lower court’s conclusion that this fifth factor “falls clearly in favor of a finding that [§ 311 (b)(6)] is criminal in nature.” 598 F. 2d, at 1193.

While we agree that this consideration seems to point toward a finding that § 311 (b)(6) is criminal in nature, that indication is not as strong as it seems at first blush. We have noted on a number of occasions that “Congress may impose both a criminal and a civil sanction in respect to the same act or omission.” Helvering v. Mitchell, supra, at 399; One Lot Emerald Cut Stones v. United States, supra, at 235. Moreover, in Helvering, where we held a 50% penalty for tax fraud to be civil, we found it quite significant that “the Revenue Act of 1928 contains two separate and distinct provisions imposing sanctions,” and that “these appear in different parts of the statute. . . .” 303 U. S., at 404. See also One Lot Emerald Cut Stones v. United States, supra, at 236-237. To the extent that we found significant the separation of civil and criminal penalties within the same statute, we believe that the placement of criminal penalties in one statute and the placement of civil penalties in another statute enacted 70 years later tends to dilute the force of the fifth Mendoza-Martinez criterion in this case.

In sum, we believe that the factors set forth in Mendoza-Martinez, while neither exhaustive nor conclusive on the issue, are in no way sufficient to render unconstitutional the congres-[*251]sionai classification of the penalty established in § 311 (b)(6) as civil. Nor are we persuaded by any of respondent's other arguments that he has offered the “clearest proof” that the penalty here in question is punitive in either purpose or effect.

Ill

Our conclusion that § 311 (b) (6) does not trigger all the protections afforded by the Constitution to a criminal defendant does not completely dispose of this case. Respondent asserts that, even if the penalty imposed upon him was not sufficiently criminal in nature to trigger other guarantees, it was “quasi-criminal,” and therefore sufficient to implicate the Fifth Amendment’s protection against compulsory self-in-erimination. He relies primarily in this regard upon Boyd v. United States, 116 U. S. 616 (1886), and later cases quoting its language.

In Boyd, appellants had been indicted under § 12 of an “Act to amend the customs revenue laws and to repeal moieties,” for fraudulently attempting to deprive the United States of lawful customs duties payable on certain imported merchandise. According to the statute in quéstion, a person found in violation of its provisions was to be “fined in any sum not exceeding $5,000 nor less than $50, or be imprisoned for any time not exceeding two years, or both; and, in addition to such fine, such merchandise shall be forfeited.” 116 U. S., at 617. Despite the pending indictment, appellants filed a claim for the goods held by the United States. In response, the prosecutor obtained an order of the District Court requiring appellants to produce the invoice covering the goods at issue. Appellants objected that such an order violated the Fourth and Fifth Amendments by subjecting them to an unreasonable search and seizure and by requiring them to act as witnesses against themselves.

This Court found the Fifth Amendment applicable, even though the action in question was one contesting the forfeiture[*252] of certain goods. According to the Court: “We are . . . clearly of opinion that proceedings instituted for the purpose of declaring the forfeiture of a man’s property by reason of offences committed by him, though they may be civil in form, are in their nature criminal.” Id., at 633-634. While at this point in its opinion, the Court seemed to limit its holding to proceedings involving the forfeiture of property, shortly after the quoted passage it broadened its reasoning in a manner that might seem to apply to the present case: “As, therefore, suits for 'penalties and forfeitures incurred by the commission of offences against the law, are of this quasi-criminal nature, we think that they are within the reason of criminal proceedings for all the purposes of the Fourth Amendment of the Constitution, and of that portion of the Fifth Amendment which declares that no person shall be compelled in any criminal case to be a witness against himself. . . Id., at 634 (emphasis added).

Seven years later, this Court relied primarily upon Boyd in holding that a proceeding resulting in a “forfeit and penalty” of $1,000 for violation of an Act prohibiting the employment of' aliens was sufficiently criminal to trigger the protections of the Self-Incrimination Clause of the Fifth Amendment. Lees v. United States, 150 U. S. 476 (1893). More recently, in One 1958 Plymouth Sedan v. Pennsylvania, 380 U. S. 693 (1965), and United States v. United States Coin & Currency, 401 U. S. 715 (1971), this Court applied Boyd to proceedings involving the forfeiture of property for alleged criminal activity. Plymouth Sedan dealt with the applicability of the so-called exclusionary rule to a proceeding brought by the State of Pennsylvania to secure the forfeiture of a car allegedly involved in the illegal transportation of liquor. Coin & Currency involved the applicability of the Fifth Amendment privilege against compulsory self-incrimination in a proceeding brought by the United States to secure for[*253]feiture of $8,674 found in the possession of a gambler at the time of his arrest.

Read broadly, Boyd might control the present case. This Court has declined, however, to give full scope to the reasoning and dicta in Boyd, noting on at least one occasion that “[s]everal of Boyd’s express or implicit declarations have not stood the test of time.” Fisher v. United States, 425 U. S. 391, 407 (1976). In United States v. Regan, 232 U. S. 37 (1914), for example, we declined to apply Boyd’s classification of penalties and forfeitures as criminal in a case where a defendant assessed with a $1,000 penalty for violation of the Alien Immigration Act claimed that he was entitled to have the Government prove its case beyond a reasonable doubt. Boyd and Lees, according to Regan, were limited in scope to the Fifth Amendment’s guarantee against compulsory self-incrimination, which “is of broader scope than are the guarantees in Art. III and the Sixth Amendment governing trials and criminal prosecutions.” 232 U. S., at 50. See also Helvering v. Mitchell, 303 U. S., at 400, n. 3. Similarly, in Hepner v. United States, 213 U. S. 103 (1909), this Court upheld the entry of a directed verdict against the appellant under a statute similar to that examined in Lees. According to Hepner, “the Lees and Boyd cases do not modify or disturb but recognize the general rule that penalties may be recovered by civil actions, although such actions may be so far criminal in their nature that the defendant cannot be compelled to testify against himself in such actions in respect to any matters involving, or that may involve, his being guilty of a criminal offense.” Id., at 112.

The question before us, then, is whether the penalty imposed in this case, although clearly not “criminal” enough to trigger the protections of the Sixth Amendment, the Double Jeopardy Clause of the Fifth Amendment, or the other procedural guarantees normally associated with criminal prosecutions, is nevertheless “so far criminal in [its] nature”[*254] as to trigger the Self-Incrimination Clause of the Fifth Amendment. Initially, we note that the penalty and proceeding considered in Boyd were quite different from those considered in this case. Boyd dealt- with forfeiture of property, a penalty that had absolutely no correlation to any damages sustained by society or to the cost of enforcing the law. See also Lees v. United States, supra (fixed monetary penalty) ; One 1958 Plymouth Sedan v. Pennsylvania, supra (forfeiture) ; United States v. United States Coin & Currency, supra (forfeiture). Here the penalty is much more analogous to traditional civil damages. Moreover, the statute under scrutiny in Boyd listed forfeiture along with fine and imprisonment as one possible punishment for customs fraud, a fact of some significance to the Boyd Court. See 116 U. S., at 634. Here, as previously stated, the civil remedy and the criminal remedy are contained in separate statutes enacted 70 years apart. The proceedings in Boyd also posed a danger that the appellants would prejudice themselves in respect to later criminal proceedings. See Hepner v. United States, supra, at 112. Here, respondent is protected by § 311 (b) (5), which expressly provides that “[notification received pursuant to this paragraph or information obtained by the exploitation of such notification shall not be used against any such person in any criminal case, except [for] prosecution for perjury or for giving a false statement.” 33 U. S. C. § 1321 (b)(5).

More importantly, however, we believe that in the light of what we have found to be overwhelming evidence that Congress intended to create a penalty civil in all respects and quite weak evidence of any countervailing punitive purpose or effect it would be quite anomalous to hold that § 311 (b) (6) created a criminal penalty for the purposes of the Self-Incrimination Clause but a civil penalty for all other purposes. We do not read Boyd as requiring a contrary conclusion.

[*255] IV

We conclude that the penalty imposed by Congress was civil, and that the proceeding in which it was imposed was not “quasi-criminal” as that term is used in Boyd v. United States, supra. The judgment of the Court of Appeals is therefore

Reversed.