Background
Mountain Valley Pipeline, LLC (MVP) sought a water quality certification from the Virginia Department of Environmental Quality (VDEQ) for the Southgate Project, a proposed pipeline traversing approximately 27 miles in Virginia and 5 miles in North Carolina. MVP applied for Virginia certification in April 2025 after VDEQ approved its Standards and Specifications agreement for erosion and sediment control on August 1, 2025. Following public comment, VDEQ issued the Certification on January 13, 2026.
Environmental groups—Dan River Basin Association, Sierra Club, Appalachian Voices, Center for Biological Diversity, and Wild Virginia—challenged the Certification, seeking judicial review and a stay pending that review. They argued that VDEQ’s decision was arbitrary and capricious for two reasons: it failed to account for MVP’s history of noncompliance during construction of the Main Pipeline, and it omitted conditions VDEQ deemed necessary to ensure compliance with water quality standards.
The Fourth Circuit heard oral argument on April 28, 2026, and denied the stay motion the following day, issuing this opinion on June 11, 2026.
The Court’s Holding
The court applied the Nken v. Holder standard, requiring petitioners to demonstrate a strong likelihood of success on the merits to obtain a stay. The Fourth Circuit found petitioners had not met this burden on either argument. As to MVP’s violation history, the court acknowledged that VDEQ had direct experience with MVP committing violations in Virginia during Main Pipeline construction. However, VDEQ provided a detailed, rational explanation for predicting future compliance: prior violations largely resulted from 2018 precipitation levels unlikely to recur; the Southgate Project traverses flatter, less challenging terrain; MVP implemented continuous iterative improvements to its erosion and sediment control practices over six years of Main Pipeline construction; the new project involves smaller diameter pipe and shorter distance; and VDEQ required daily third-party inspection and continuous U.S. Geological Survey monitoring. The court found this explanation provided rational support for VDEQ’s prediction despite MVP’s history.
On the conditions argument, the court held that the Certification adequately incorporated erosion and sediment control requirements by reference. The Certification’s operative condition requires MVP to conduct activities as described in the April 2025 Joint Permit Application and materials received through October 2, 2025. This condition explicitly incorporates the S&S agreement and site-specific plans requiring MVP’s compliance with VDEQ’s erosion and sediment control standards. VDEQ and MVP repeatedly represented that MVP remains bound by these commitments, making the incorporation legally sufficient even if not explicitly restated within the Certification itself.
Key Takeaways
- An agency may rely on a rational explanation distinguishing a regulated entity’s past violations from predicted future performance when issuing environmental permits, even when that entity has a documented compliance history.
- Conditions imposed on environmental permits may be satisfied through incorporation by reference to documents in the administrative record, provided the agency clearly ties the condition to specific, identified materials.
- On preliminary stay motions, courts will not engage in line-by-line scrutiny of supplemental reports when the agency’s primary reliance rests on separate, independent studies by established scientific bodies.
Why It Matters
This decision upholds VDEQ’s water quality certification despite MVP’s documented compliance violations, signaling that agencies can proceed with permitting for subsequent projects by a repeat violator if they articulate reasoned, project-specific explanations for predicting improved compliance. The ruling narrows environmental groups’ leverage in challenging pipeline permits through litigation on stay motions—they must demonstrate not merely that violations occurred previously, but that the agency’s risk assessment is unreasoned.
The decision also reinforces that incorporation by reference is a valid permitting technique, allowing agencies to avoid restating extensive conditions in the certification itself provided the mechanism of incorporation is clear. However, the court’s reasoning leaves open questions about what level of detail an agency must provide when distinguishing a current project from a regulated entity’s prior misconduct.