delivered the opinion of the court:
In this case we must decide whether section 42(e) of the Environmental Protection Act (the Act) (415 ILCS 5/1 et seq. (West 2002)), authorizes a court to issue a mandatory injunction requiring a polluter to clean up contamination it caused. In 1994 the State brought suit against defendants Agpro, Inc., and David J. Schulte, as an individual and as president of Agpro, Inc., seeking injunctive relief, recovery of remediatiоn costs, and civil penalties. In 2002 the matter proceeded to a bench trial, after which the circuit court of Ogle County awarded certain remediation costs and imposed a civil penalty, but refused injunctive relief. The State appealed and defendants cross-appealed. The appellate court reversed and remanded on an issue pеrtaining to remediation costs, but affirmed the circuit court in all other respects, including the denial of injunctive relief.
BACKGROUND
We state only those facts necessary to understand the single question before this court. The appellate court’s оpinion includes a more complete statement. See
Between 1988 and 1993 defendants operated a business applying fertilizers and pesticides to farm fields. The business was based at a site in the town of Woosung (the Agpro site). The State alleged, and the circuit court found, that defendants caused or allowed the soil at the Agpro site to be contaminated by pesticides. The contaminants are also present in the groundwater and in several wells immediately surrounding the Agpro site. In 1991 federal authorities remedied the contamination of the wells by installing filtration systems in eight private residences. As of 2000 testing of wells on and adjacent to the Agpro site continued to show pesticide contamination.
The State asked the circuit court to ordеr defendants to take certain actions to clean up the Agpro site, such as removal of all contaminated soil. The circuit court refused, citing three express grounds, the first of which was that “there is no legal basis to issue an injunction which requires the Defendants to perform affirmative acts.” The appellate court found this ground sufficient to affirm, and thus did not reach any оther grounds for the denial of injunctive relief. Before the appellate court, the State argued that section 42(e) of the Act authorizes issuance of a mandatory injunction requiring defendants to clean up the Agpro site. At all relevant times section 42(e) of the Act provided that, “[t]he State’s Attorney of the county in which the violation occurred, or the Attorney General, may *** institute a civil action for an injunction to restrain violations of this Act.” 415 ILCS 5/42(e) (West 2002). The appellate court reasoned that the word “restrain” in section 42(e) shows “that the legislature contemplated a preventative injunction or restraining order rather than a mandatory injunction commanding a defendant to do some affirmative act.”
The appellate court filed its decision on January 27, 2004. Some six months later the General Assembly amended section 42(e) to provide for an injunction, “prohibitory or mandatory,” to restrain violations of the Act and to permit the circuit court to “require such other actions as may be necessary tо address violations of this Act.” Pub. Act 93 — 831, § 5, eff. July 28, 2004 (amending 415 ILCS 5/42(e)).
ANALYSIS
Whether a mandatory injunction may issue in this case is a question of statutory construction, which we review de novo. Michigan Avenue National Bank v. County of Cook,
In this case, section 42(e) of the Act, the only authority the State cites as authorizing the mandatory injunction it seeks, permits an “injunction to restrain violations of this Act.” 415 ILCS 5/42(e) (West 2002). The appellate court relied on the meaning of the word “restrain” to conclude the legislature did not contemplate a mandatory injunction in section 42(e).
First, the State suggests section 42(e) is ambiguous because the word “restrain” permits a reasonable interpretation that includes a mandatory injunction. The State points out that the fifth edition of Black’s Law Dictionary gives one of the meanings of “restrain” as “enjоin,” which, in turn, can denote a mandatory injunction. Black’s Law Dictionary 1181 (5th ed. 1979). However, the sixth edition of Black’s Law Dictionary, the last to include a definition of “restrain,” does not list “enjoin” as a synonym. Black’s Law Dictionary 1314 (6th ed. 1990). Moreover, assuming arguendo that “restrain” can mean “enjoin” in some contexts, it does not carry that meaning in section 42(e). If it did, the phrase “injunction to restrain” would mean “injunction to enjoin,” which is redundant. If possible, we will avoid constructions that render any term superfluous or meaningless. In re Marriage of Kates,
Second, the State points out various provisions of the Act that seem to contemplate mandatory injunctions. Section 45(d) concerns third-party complaints in cases in which the State “seeks to compel the defendаnt to remove the waste or otherwise clean up the site.” 415 ILCS 5/45(d) (West 2002). Section 58.1(a)(2) refers to persons “required to perform investigations and remediations.” 415 ILCS 5/58.1(a)(2) (West 2002). Section 58.9(a)(1) limits suits seeking “to require any person to conduct remedial action” to the remediation of pollution that the defendant proximately caused. 415 ILCS 5/58.9(a)(l) (West 2002). Section 58.9(b) requires notice when the Stаte “seeks to require a person who may be liable pursuant to this Act to conduct remedial activities.” 415 ILCS 58.9(b) (West 2002). The State correctly urges that a statute must be construed as a whole. Kates,
Third, the State argues that the legislature’s recent amendment of section 42(e) “clarifies” what the legislature meant by the phrase “injunction to restrain” by stating that it includes mandatory injunctions. The State relies on Collins v. Board of Trustees of the Firemen’s Annuity & Benefit Fund of Chicago,
Roth concerned the following situation. In People v. DuMontelle,
In Roth, the amendment at issue purported to reverse a decision of this court. In this case the legislature responded to a decision of the appellate court. That difference, however, is immaterial. In re Marriage of Cohn,
The State seeks to distinguish Roth by pointing out that, in Roth, the amendment expressly stated that it was a retroactive declaration of existing law. However, in this case the State as a party, not the legislature, is trying to vest the recent amendment with controlling weight by arguing that it is a retroactive “clarification” of the original meaning of section 42(e). We reject the State’s argument. We conclude the recent amendment is not a retrospective “clarification” of existing law, but is instеad a change in the law.
Collins, the case relied upon by the State, is not to the contrary. In Collins the legislature had, in 1983, redefined fire paramedics as “firemen” for purposes of participation in the Firemen’s Annuity and Benefit Fund (Firemen’s Fund). In 1987, in Herhold v. Retirement Board of the Firemen’s Annuity & Benefit Fund,
Collins is clearly distinguishable. The amendment at issue in Collins, though enacted in response to Herhold, did not attempt to reverse Herhold. While Herhold concerned disability, the amendment concerned retirement. If we accepted the State’s argument in this case, the recent amendment to section 42(e), in effect, would reverse the appellate court by “clarifying” the statute in a way that flatly contradicts the appellate court’s holding that the plain meaning of section 42(e) excludes mandatory injunctions. In order to avoid confusion, we must distinguish a line of cases not cited to us by either party. In those cases, we have relied on a subsequent amendment as some evidence that a lower court has misconstrued what the legislature originally intended in a statute. See, e.g., Mattis v. State Universities Retirement System,
Fourth, the State suggests that even if section 42(e) permits only prohibitory injunctions, the defendants may nevertheless be ordered to clean up the Agpro site. The State relies on Illinois State Toll Highway Authority v. Amoco Oil Co.,
We decline to apply Amoco Oil as the State suggests. Amoco Oil did not concern section 42(e) or mandatory injunctions. Assuming, arguendo, that Amoco Oil recognized the concept of a “continuing violation” for purposes of stating a claim for contribution, we could not apply that concept to the question at bar. If every consequence of a violation of the Act were a continuing violation subject to an “injunction to restrain” under section 42(e), then indeed mandatory injunctions would be permitted. However, as we have explained, the plain meaning of the phrase “injunction to restrain” shows the legislature did intend to limit relief under section 42(e) to prohibitory injunctions. In other words, even if Amoco Oil is relevant to the case at bar, it is simply insufficient to overcome the plain meaning of section 42(e). Fifth, the State suggests it must be possible to “restrain” a failure to clean up, otherwise section 42(e) could not be used to restrain other failures to act, such as failure to shut the valve of a pipe discharging contaminants or failure to fix a leaking underground tank. This argument also fails because it asks us to ignore the ordinary meanings of words. A person who leaves a valve open or lets a tank go on leaking is polluting, just as a person who opens the tap and leaves the room is filling thе bathtub. Ongoing actions like polluting or filling the tub may be “restrained” — by ordering the person to stop — without doing violence to the ordinary meaning of the word. Defendants, however, are not now polluting; they polluted. Moreover, as the appellate court stated, the plain language of the Act prohibits depositing contaminants on the land so as to create a watеr pollution hazard; “it does not prohibit the mere existence of a water pollution hazard.”
In sum, none of the State’s arguments overcome the plain and unambiguous meaning of section 42(e). We note further that section 42(e), as we have construed it, forms part of a reasonable remedial scheme. Under section 43(a) of the Act, in certain emergency situations not alleged to be present in this case, courts are authorized to “require such *** action as may be necessary.” 415 ILCS 5/43(a) (West 2002). This broad authorization presumably includes any mandatory injunction “as may be necessary.” Moreover, as the appellate court noted, in any situation where section 43(a) does not apply, the State may itself clean up and then recover costs from those who are liable under the Act.
CONCLUSION
For the foregoing reasons, we hold that sеction 42(e) of the Act does not authorize a mandatory injunction ordering defendants to take affirmative action to clean up the Agpro site. Because of our disposition, we need not address the other reasons the circuit court gave to explain its denial of injunctive relief. The judgment of the appellate court is affirmed.
Affirmed.
