Natural Gas Act Review of State Water Permits Uses the Federal Arbitrary-and-Capricious Standard

1. Introduction

This decision clarifies the standard governing federal appellate review of state environmental permitting decisions associated with federally authorized natural gas infrastructure. The Third Circuit held that the federal arbitrary-and-capricious standard governs petitions under 15 U.S.C. § 717r(d)(1), absent a legislative directive or choice-of-law rule requiring a different approach. It also upheld Pennsylvania’s substantive evaluation of water quality, wetland restoration, mitigation, and cumulative environmental effects.

The dispute arose from Transcontinental Gas Pipe Line Company’s proposed expansion of natural gas transmission through Pennsylvania, New Jersey, and Maryland. The project included two new pipeline segments in Pennsylvania and associated facilities. The Federal Energy Regulatory Commission issued a conditional certificate of public convenience and necessity, requiring compliance with applicable water-quality requirements before construction could proceed.

The Pennsylvania Department of Environmental Protection, or PADEP, conditionally certified the project under § 401 of the Clean Water Act. That certification depended on Transco obtaining an erosion and sediment control permit under Chapter 102 of Pennsylvania’s environmental regulations and water obstruction and encroachment permits under Chapter 105. Following public participation, PADEP issued those permits.

Delaware Riverkeeper Network, Maya K. van Rossum, the Delaware Riverkeeper, and Citizens for Pennsylvania’s Future—collectively described in the opinion as “Riverkeepers”—challenged the permits before the Pennsylvania Environmental Hearing Board. Construction nevertheless proceeded, and the pipeline began transporting gas in 2024. After a five-day hearing involving eleven witnesses, including seven experts, the Board dismissed the challenge. Riverkeepers then petitioned the Third Circuit for review, with Transco intervening in support of the Pennsylvania respondents.

The central questions were:

• Which standard governs federal review of the state permitting decision?
• Did PADEP adequately assess water quality and wetland effects without requiring Riverkeepers’ preferred testing and analytical methods?
• Did the permitting process satisfy Pennsylvania’s Environmental Rights Amendment independently of regulatory compliance?

2. Summary of the Opinion

The court denied the petition and left the permits undisturbed. Its principal conclusions were:

1. Federal review standard: The arbitrary-and-capricious standard reflected in 5 U.S.C. § 706 governs review under § 717r(d)(1), subject to contrary legislative or choice-of-law requirements. The Administrative Procedure Act does not itself directly regulate state agencies; the applicable standard also reflects longstanding principles of judicial review.
2. Independent legal judgment: Courts continue to decide pure questions of statutory and regulatory interpretation de novo. Deference to technical and discretionary decisions does not transfer responsibility for determining legal meaning to the agency.
3. Chapter 102 permit: The regulations did not invariably require pre- and post-construction in-stream sampling. PADEP reasonably relied on extensive site-specific information, protective practices, and construction methods to assess water-quality protection.
4. Chapter 105 permits: The record supported PADEP’s treatment of temporary disturbances, permanent vegetation changes, restoration, replacement wetlands, monitoring, and cumulative effects.
5. Environmental Rights Amendment: Riverkeepers’ constitutional arguments substantially repeated their unsuccessful regulatory objections. Given the extensive regulatory review and absence of special circumstances requiring additional precautions, the Commonwealth satisfied its trustee obligations.

The decision is therefore both a clarification of federal administrative review and a record-specific approval of Pennsylvania’s environmental permitting judgments.

3. Precedents Cited and Their Influence

A. Resolving the standard-of-review question

Del. Riverkeeper Network v. Sec'y Pa. Dep't of Env't Prot. (Riverkeeper I), 833 F.3d 360 (3d Cir. 2016)

This was the principal circuit precedent supporting arbitrary-and-capricious review of state action taken under federal law. It involved PADEP permitting under the Clean Water Act in a § 717r(d)(1) proceeding. The present opinion also relied on it for the requirement of a rational explanation, the challenger’s obligation to demonstrate prejudice, and the proposition that mistakes unrelated to the substantive outcome do not warrant relief.

Nat. Res. Def. Council, Inc. v. N.J. Dep't of Env't Prot., 2026 WL 2639510 (3d Cir. Sept. 8, 2026)

The court cited this recent decision as another application of arbitrary-and-capricious review to state environmental action. It reinforced the existing line of authority that the present opinion expressly confirmed.

Twp. of Bordentown v. FERC, 903 F.3d 234 (3d Cir. 2018)

This decision supplied the apparent tension. It had looked to state law to determine the “prism” of review and referred to affording state agencies the deference available under state law. The court reconciled that language with federal arbitrary-and-capricious review by treating it as addressing the permissible consideration of agency interpretations, rather than requiring wholesale adoption of a state appellate review standard.

Tire Jockey Serv., Inc. v. Commonwealth, Dep't of Env't Prot., 915 A.2d 1165 (Pa. 2007)

This case identified the Pennsylvania review standard urged by Riverkeepers and the Commonwealth: review for legal error and for substantial evidentiary support for necessary factual findings. It framed the competing approach but did not provide the governing federal standard.

Del. Riverkeeper Network v. Sec'y Pa. Dep't of Env't Prot. (Riverkeeper II), 903 F.3d 65 (3d Cir. 2018), and Del. Riverkeeper Network v. Sec'y Pa. Dep't of Env't Prot. (Riverkeeper III), 783 F. App'x 124 (3d Cir. 2019)

The opinion cited these decisions as further support for reviewing state action under the Clean Water Act through the federal arbitrary-and-capricious framework. Their role was confirmatory, situating the clarification within an established series of pipeline-permitting cases.

B. The historical basis for reviewing discretion

Estwick v. City of London, 82 Eng. Rep. 515 (KB) (1647); Rooke's Case, 5 Co. Rep. 99b (1598); and R. v. Askew, 98 Eng. Rep. 139 (KB) (1768)

These authorities supported the historical proposition that a grant of discretion means sound discretion, bounded by reason and law. They helped explain why reviewing a state agency for arbitrariness does not depend exclusively on the APA’s direct application.

Merrill v. Humphrey, 24 Mich. 170 (1871)

The opinion used this state decision to show that arbitrary exercises of official authority by nonfederal actors have long been subject to judicial correction. Its significance lies in extending the historical account beyond federal administrative bodies.

Buttz v. N. Pac. R.R. Co., 119 U.S. 55 (1886)

The Supreme Court’s refusal to treat a railroad’s congressionally authorized route selection as immune from scrutiny illustrated that delegated authority does not require acceptance of arbitrary choices. It supported the distinction between possessing discretionary power and exercising that power reasonably.

Am. Sch. of Magnetic Healing v. McAnnulty, 187 U.S. 94 (1902)

This decision supplied another pre-APA example of judicial authority to restrain uncontrolled administrative action. Together, these historical cases supported the court’s characterization of the APA standard as a restatement of an older judicial principle.

The opinion supplemented these cases with Locke’s account of arbitrary executive will, Broom’s legal maxims, and writings by Cicero and Aquinas connecting law with reason. These were explanatory sources, not independently controlling legal rules. The Attorney General’s 1947 APA manual supplied a more direct administrative-law link by describing the Act’s review provisions as a general restatement of existing principles.

C. Modern review of state agencies and legal interpretation

Alaska Dep't of Env't Conservation v. EPA, 540 U.S. 461 (2004)

The court relied on the Supreme Court’s recognition of substantial leeway for a permitting authority and its focus on whether a state agency’s determination was reasonable in light of statutory guidance and the administrative record. This supported substantive reasonableness review without suggesting that the APA directly governs the state agency.

Sierra Club v. W. Va. Dep't of Env't Prot., 64 F.4th 487 (4th Cir. 2023), and Const. Pipeline Co. v. N.Y. St. Dep't of Env't Conservation, 868 F.3d 87 (2d Cir. 2017)

These decisions showed that other circuits likewise use an arbitrary-and-capricious standard when reviewing state Clean Water Act decisions. The latter also distinguished correct interpretation of federal law from deferential review of factual determinations, reinforcing the opinion’s separation of legal meaning from administrative judgment.

Loper Bright Enters. v. Raimondo, 603 U.S. 369 (2024)

This decision supplied the contemporary foundation for independent judicial interpretation of statutes and regulations. The court used it to explain why respect for agency expertise cannot eliminate the judiciary’s responsibility to determine the boundaries of delegated authority.

Skidmore v. Swift & Co., 323 U.S. 134 (1944), and United States v. Am. Trucking Ass'ns, 310 U.S. 534 (1940)

Cited through Loper Bright Enters. v. Raimondo, these authorities supported consulting the interpretations of officials charged with administering a statute. Such interpretations may assist judicial judgment; they do not displace it.

Dep't of Env't Prot. v. Cumberland Coal Res., LP, 102 A.3d 962 (Pa. 2014), and Mylan Inc. & Subsidiaries v. Comm'r of Internal Revenue, 76 F.4th 230 (3d Cir. 2023)

These cases expressly supported de novo review of pure legal questions. Their inclusion prevents the opinion’s deferential treatment of technical permitting choices from being mistaken for deference on all questions presented.

Motor Vehicle Mfrs. Ass'n of the U.S., Inc. v. State Farm Mut. Auto. Ins. Co., 463 U.S. 29 (1983)

Through Riverkeeper I, this case furnished the operative test: the agency must examine relevant information and satisfactorily explain the rational connection between its factual findings and its decision. The court therefore examined what PADEP actually considered, rather than merely accepting its conclusion.

D. Evidence, credibility, and the challenger’s burden

Leatherwood, Inc. v. Commonwealth, Dep't of Env't Prot., 819 A.2d 604 (Pa. Commw. Ct. 2003)

The court relied on this decision when declining to reweigh evidence or revisit the Board’s credibility determinations. Its discussion of an inadequately supported environmental risk also helped reject Riverkeepers’ contention that the Board improperly demanded affirmative evidence relevant to the alleged risk.

Gibraltar Rock, Inc. v. Pa. Dep't of Env't Prot., 286 A.3d 713 (Pa. 2022)

This case established the burden governing Riverkeepers’ third-party administrative challenge: proof by a preponderance of the evidence that PADEP acted unlawfully, unreasonably, or without factual support. The court concluded that the Board applied that burden rather than imposing an impermissibly heightened one.

E. Environmental constitutional duties

Pa. Env't Def. Found. v. Commonwealth, 161 A.3d 911 (Pa. 2017)

This decision supplied the governing trust framework under Pennsylvania’s Environmental Rights Amendment. State agencies must reasonably pursue the trust’s purposes and give beneficiaries due regard. The present opinion applied that framework rather than treating the Amendment as merely aspirational.

Robinson Twp., Washington Cnty. v. Commonwealth, 83 A.3d 901 (Pa. 2013) (plurality opinion)

The court drew on this plurality opinion for the relationship between the Amendment’s broad language and complementary legislation supplying administrative procedures and technical standards. It also relied on its recognition that conservation duties operate alongside legitimate development. The plurality status matters: the cited discussion should not be described as an undifferentiated majority holding.

Hetherton v. Sears, Roebuck & Co., 593 F.2d 526 (3d Cir. 1979)

The court used this case by analogy. Its principle that compliance with legislatively prescribed safety standards normally eliminates the need for additional precautions, absent special circumstances, supported the conclusion that comprehensive environmental compliance ordinarily satisfies reasonable trustee conduct. It was not itself an Environmental Rights Amendment decision.

Liberty Twp. v. PADEP, 2024 WL 202006; Del. Riverkeeper Network v. PADEP, 2022 WL 1200101; and Ctr. for Coalfield Just. v. PADEP, 2017 WL 3842580

These Environmental Hearing Board decisions illustrated its consistent rejection of constitutional challenges that merely repackage alleged regulatory deficiencies. They provided supporting administrative practice, not controlling appellate authority eliminating independent constitutional obligations.

4. Legal Reasoning

A. A federal review standard, without direct APA coverage of state agencies

The opinion’s principal doctrinal clarification separates the source of substantive environmental requirements from the standard governing federal judicial review. Pennsylvania regulations determine what the permits must accomplish. That does not mean Pennsylvania’s appellate review rules necessarily govern a federal petition brought under the Natural Gas Act.

The court acknowledged that state agencies fall outside the APA’s direct coverage. Nevertheless, it treated § 706’s arbitrary-and-capricious formulation as embodying a longstanding judicial requirement of reasoned administration. The result was a federal review rule for state action taken under congressional authority, qualified where legislation or an applicable choice-of-law rule directs otherwise.

The court also distinguished two judicial tasks:

• Determining legal authority: Courts independently interpret statutes and regulations and identify the limits of delegated power.
• Reviewing decisions within that authority: Courts examine whether the agency’s technical and discretionary judgments were reasoned, supported, and consistent with governing requirements.

The opinion additionally stated, through Riverkeeper I, that factual determinations are reviewed for clear error. Its overall approach therefore cannot be reduced to unrestricted agency deference: legal interpretation remains independent, factual findings remain reviewable, and discretionary choices require rational explanation.

B. Chapter 102: two standards, but no mandatory universal sampling method

Pennsylvania’s antidegradation rules distinguish ordinary waters, High Quality waters, and Exceptional Value waters. Existing uses must be protected generally. High Quality waters receive stronger protection, although specified economic or social development may justify reduced quality. Exceptional Value waters receive protection without that exception.

For the protected watersheds involved here, an applicant lacking an available nondischarge alternative had to meet both a technology-based standard and a water-quality-based standard:

• The technology-based standard requires an antidegradation best available combination of technologies, or ABACT.
• The water-quality-based standard requires a demonstration that existing receiving-water quality will be maintained and protected.

The court did not collapse these obligations into one. Instead, it rejected Riverkeepers’ factual premise that PADEP had considered technology alone. PADEP had reviewed information about water resources, flow, depth, streambed materials, slopes, vegetation, aquatic organisms, and stream geometry. The permit also required protective practices and restoration to meadow in good condition.

Riverkeepers preferred pre- and post-construction in-stream sampling, but no cited regulation required that particular method in every project. The provision on which they relied allowed consideration of specified information; it did not invariably mandate collection of their preferred data. Whether further sampling was necessary therefore fell within reasoned professional judgment.

The Board credited Transco’s explanations that such testing was not reasonable for this project. It also relied on “in the dry” construction, which temporarily diverts flow away from the excavation area, and on extensive pre- and post-construction information already required by Chapter 102.

The distinction is important: the absence of one testing method is not equivalent to the absence of a water-quality assessment. The holding depends on the information actually available and the explanation for treating it as sufficient. It does not exempt future applicants from sampling where regulations, site conditions, or demonstrated risks require it.

C. Evidentiary burdens and the significance of environmental risk

Riverkeepers argued that the Board had improperly required proof of environmental harm rather than proof of an inadequate permitting process. The court rejected that characterization. Their challenge concerned open-ended standards designed to prevent environmental damage, making evidence of relevant risk important to showing that PADEP’s conclusions were unreasonable.

This does not establish a general requirement that environmental challengers wait for actual injury. A violation of a mandatory procedure or a supported showing of prospective risk could present a different case. Here, however, the Board found the technical record sufficient and Riverkeepers’ competing evidence unpersuasive.

The Board’s expert assessments were central. It found that Riverkeepers’ ecologists lacked qualifications to evaluate engineering design of control measures. Their wetland evidence also lacked specificity and rested on an incomplete review without site visits. The appellate court declined to substitute its own credibility judgments for those reached after the evidentiary hearing.

D. Chapter 105: “impact” is not automatically “adverse impact”

The Chapter 105 analysis turned on regulatory distinctions among physical change, adverse effects, and impairment of wetland functions and values. The regulations impose different thresholds for Exceptional Value and other wetlands and require consideration of cumulative effects. Their broad evaluative terms leave room for reasonable technical judgment.

The court emphasized that a project may affect a wetland without necessarily causing the legally prohibited adverse impact. Restoration can rectify disturbances, and mitigation can address effects that remain. Whether an effect is adverse depends on the governing functional standards and the evidence, not simply on whether some physical alteration occurs.

For temporary disturbances, the record required full restoration within a reasonable period and extensive monitoring. Riverkeepers identified neither a legal prohibition on that restoration period nor persuasive evidence that permanent damage had been mislabeled temporary.

For permanent vegetation changes, the Board recognized that periodic mowing above the pipeline would prevent tree growth along a narrow corridor. It nevertheless found no loss of hydrological or biogeochemical processes. Offsite replacement exceeded the regulatory minimum one-to-one ratio and accounted for the vegetation conversion.

The court’s acceptance of this arrangement was record-specific. It did not hold that all mowing is harmless, that all wetland types are interchangeable, or that any replacement automatically satisfies Chapter 105.

E. Cumulative effects were evaluated, not presumed away

Riverkeepers also challenged the combined consequences of the project and earlier pipelines, particularly the widening of existing rights-of-way. PADEP had considered Transco’s cumulative-effects analysis, including nearby pipelines and the environmental efficiencies associated with collocation.

The record addressed widening and repeated vegetation removal, rather than ignoring them. The Board credited testimony that mitigation accounted for the effects and that, considered together, they would not impair wetland resources. The court therefore upheld the cumulative-effects determination because it had an evidentiary foundation—not because collocation categorically eliminates cumulative harm.

F. Regulatory compliance and the Environmental Rights Amendment

Article I, § 27 of Pennsylvania’s Constitution requires the Commonwealth, as trustee, to conserve and maintain public natural resources. The court accepted that complementary environmental legislation does not completely discharge that constitutional responsibility.

Nevertheless, it concluded that compliance with comprehensive implementing regulations will “almost always” satisfy the trustee’s obligation to act reasonably, absent special circumstances. This is a strong practical connection between regulatory compliance and constitutional adequacy, but not an absolute constitutional safe harbor.

Riverkeepers’ constitutional arguments repeated three objections already addressed under the regulations: inadequate water-quality information, insufficient monitoring, and failure to account for the time needed to replace mature vegetation. The court found that PADEP had considered extensive relevant data, that the permits imposed adequate monitoring, and that enhanced replacement ratios accounted for tree-growth delays.

The constitutional claim therefore failed because the record did not establish an additional deficiency or special circumstance requiring further precautions. The court declined to derive more granular project requirements from the Amendment’s broad language on the facts presented.

5. Potential Impact

A. Greater consistency in federal review

The decision reduces uncertainty created by differing formulations in earlier Third Circuit opinions. Future § 717r(d)(1) litigants should ordinarily organize their challenges around federal arbitrary-and-capricious review, while recognizing the express exception for contrary legislative or choice-of-law requirements.

B. More focused challenges to technical decisions

Objectors will need to distinguish a legally mandatory requirement from a preferred investigative technique. Where regulations leave methodology open, a successful challenge will generally require a concrete explanation of why the agency’s information or reasoning was inadequate, supported where appropriate by qualified expert evidence.

For agencies and applicants, the decision underscores the value of a documented, site-specific assessment explaining why chosen controls, restoration measures, monitoring, and mitigation satisfy each applicable standard. A favorable outcome here does not authorize reliance on technology-based controls without a separate water-quality assessment.

C. A significant, but qualified, limit on constitutional repackaging

The Environmental Rights Amendment discussion makes it harder to obtain a different result simply by relabeling rejected regulatory arguments as constitutional violations. Its broader significance lies in treating comprehensive regulatory compliance as ordinarily strong evidence of reasonable trustee conduct.

Important limits remain. The opinion acknowledges continuing constitutional duties and the possibility of special circumstances. A future case involving an inadequately addressed resource risk or a distinct trust-based deficiency would not necessarily be resolved by this decision. Nor does a federal appellate interpretation eliminate the importance of future Pennsylvania Supreme Court guidance on the state Constitution.

D. Important boundaries of the holding

The court did not decide the merits of FERC’s certificate, create a general exemption from water testing, approve every form of wetland conversion, or hold that completed environmental injury is essential to judicial review. Its substantive result rests on this permitting record and the Board’s supported findings.

6. Complex Concepts Simplified

Arbitrary-and-capricious review

A court checks whether the agency considered the important information and reasonably explained its choice. It does not simply choose the policy or technical answer it prefers.

De novo review

The court answers a legal question independently rather than accepting the agency’s interpretation as controlling.

Section 401 certification

A state determination that a federally permitted or licensed activity with potential discharges will comply with applicable water-quality requirements.

Antidegradation

Rules protecting existing water uses and quality, with especially strong protection for designated high-value waters.

Technology-based versus water-quality-based standards

The first concerns the protective techniques used; the second concerns whether the receiving water will actually remain protected. Meeting one does not automatically eliminate the other.

Wetland functions and values

The ecological and hydrological work a wetland performs, including processes involving water movement and biological and chemical activity.

Mitigation and replacement ratios

Measures addressing environmental effects, sometimes through restoration or replacement. A ratio above one-to-one requires more replacement than the amount affected.

Cumulative effects

The combined consequences of multiple disturbances, which may matter even when individual changes appear limited.

Public-trust obligations

The Commonwealth must manage public natural resources as a trustee for beneficiaries, not merely as an owner free to disregard their interests.

7. Conclusion

The opinion’s central precedent is that federal arbitrary-and-capricious review governs state environmental action challenged under the Natural Gas Act, unless another applicable legal directive requires otherwise. Courts independently determine legal meaning while respecting reasoned technical judgments within delegated authority.

On the merits, the decision confirms that environmental protection may be demonstrated through a well-supported combination of site information, protective practices, restoration, monitoring, and mitigation—not necessarily through an objector’s preferred testing method. It also gives comprehensive regulatory compliance substantial weight under Pennsylvania’s Environmental Rights Amendment, while preserving the possibility that distinct constitutional duties or special circumstances may require more.