470 U.S. 116 (U.S. Supreme Court 1985)
Chemical Manufacturers Association v. Natural Resources Defense Council sits at the intersection of environmental policy and administrative law, testing how far courts will defer to an expert agency's interpretation of a complex statute.
Does § 301(l) of the Clean Water Act prohibit EPA from granting "fundamentally different factors" variances from categorical effluent limitation guidelines that regulate toxic pollutants?
Under Chevron U.S.A. Inc. v. NRDC, courts reviewing an agency's construction of a statute it administers ask first whether Congress has directly spoken to the precise question at issue. If the statute is silent or ambiguous with respect to the specific issue, the court does not impose its own construction but defers to the agency's interpretation so long as it is a permissible (reasonable) reading of the statute. In the Clean Water Act context, EPA may adopt reasonable constructions that reconcile the Act's commitment to nationally uniform, technology-based controls with narrow, case-specific mechanisms that ensure fairness where a facility's circumstances are fundamentally different from those considered in setting the national limits.
No. The Supreme Court held that § 301(l) does not bar EPA's use of "fundamentally different factors" variances for categorical effluent limitations applicable to toxic pollutants. Applying Chevron deference, the Court concluded EPA's interpretation was a reasonable construction of the Act and reversed the D.C. Circuit.
The case is a cornerstone for law students studying Chevron deference in action. It demonstrates how courts evaluate whether a statute directly speaks to a specific regulatory tool and, if not, whether an agency's reconciliation of competing statutory aims is reasonable. Substantively, it validates the FDF variance as a narrow, fairness-oriented safety valve embedded within categorical, technology-based regulation under the Clean Water Act. Institutionally, it shows the Supreme Court's willingness to credit agency expertise when statutes are technical and incomplete. In the wake of the decision, Congress later codified the FDF concept, confirming its centrality to the CWA's regulatory architecture and the decision's practical staying power.