Beyond the Potomac Spill: How Infrastructure Stewardship Shapes Compliance Risk
The recent sewage spill into the Potomac River began with the structural collapse of a 72-inch interceptor sewer line built in the early 1960s — a major trunk line carrying wastewater toward regional treatment facilities. The failure released hundreds of millions of gallons of untreated sewage before emergency bypass pumping could be installed.
Response efforts continue, with federal assistance joining local and state crews. The U.S. Army Corps of Engineers has supported stabilization and site protection. Investigations into the cause remain underway.
Even so, public debate has already shifted toward assigning responsibility — with elected officials, river advocates, and commentators pointing fingers across agencies and jurisdictions. At the same time, the utilities and government entities involved have pivoted toward cooperation under established interjurisdictional agreements and defined operational roles.
More than simply a news story, this is a case study in how regional system design, Clean Water Act enforcement, and infrastructure stewardship together determine who bears compliance risk when failures occur.
This article explains these dynamics and outlines practical ways wastewater utilities can reduce compliance risk.
The Real Cost of Failure
When a major sewer line collapses, the costs extend well beyond repair.
Emergency construction, environmental monitoring, public communication, and operational disruption add up quickly. Unauthorized discharges can trigger ongoing violations and daily penalties until releases are stopped and contamination addressed. In Maryland, pollutants need not reach surface waters to create exposure; wastewater that ponds or enters groundwater can also constitute a discharge.
A single failure can quickly become a multi-million-dollar event.
Prevention is not abstract. It is financial and regulatory risk management.
What Enforcement Has Done — and What It Cannot Do
For more than two decades, sewer infrastructure investment across much of the region has been driven by enforcement. Consent decrees required inspections, modeling, rehabilitation programs, and reporting. Systems are stronger today because of that work.But consent decrees compel action; they do not resolve long-term economics.
Earlier EPA estimates suggested that substantially reducing sewer overflows nationwide would require roughly $88 billion in additional investment beyond existing infrastructure. More than 90 municipal sewer consent decrees since the late 1990s account for over $50 billion in compliance costs.
Closer to home, WSSC Water alone estimates more than $1.6 billion in expenditures tied to its sewer overflow consent decree.
The scale is significant — and ongoing.
The Perfection Assumption
Regulatory frameworks treat sanitary sewer overflows as events that should never occur.
The goal is understandable. But it assumes near-perfection in systems built decades ago, buried in shifting soils, and exposed to evolving climate conditions.
Even well-managed systems experience failures. A completely impermeable network is
not realistic.
When overflows are prohibited outright — even where utilities invest heavily in prevention — systems can drift toward perpetual enforcement rather than structured risk management.
From Compliance to Stewardship
Most discharge permits for municipal wastewater treatment plants require proper operation and maintenance of the associated collection system. What they rarely require is the structured prevention approach that grew out of enforcement — commonly referred to as CMOM (Capacity, Management, Operations, and Maintenance).
Where implemented effectively, these programs include:
• risk-based inspections
• preventive maintenance cycles
• overflow response planning
• data-driven rehabilitation
Beyond reducing failures, they create documentation of diligence and prioritization — the same records regulators examine when violations occur.
These frameworks shift systems from reacting to failures toward managing risk.
Why This Matters Legally
Stewardship is not only operational. It affects legal exposure.
Utilities with documented asset inventories, inspection programs, and risk prioritization are not immune from violations. But when failures occur, they are often better positioned to demonstrate good-faith compliance efforts and resolve enforcement matters more efficiently.
Regulators routinely evaluate surrounding circumstances — not just the discharge — including whether risks were identified, resources allocated thoughtfully, and corrective action taken promptly.
Stewardship reduces overflow frequency. It also shapes enforcement posture when problems arise. In that sense, it is often the most durable form of compliance assurance.
Thinking in Terms of the Sewershed
A sewershed, like a watershed, reflects
how infrastructure actually functions hydraulically, not how it is divided politically.
The Potomac spill illustrates this reality. The failed interceptor is part of a regional network serving multiple jurisdictions. The response involves coordination among utility operators, federal emergency resources, and Maryland regulators. It demonstrates how infrastructure failures quickly become multi-jurisdictional compliance events shaped by shared responsibilities.
This is not unique. It is how most major sewer systems operate.
Why Enforcement Has Filled the Regulatory Gap
Under the Clean Water Act, discharge permits are typically issued to the operator of the wastewater treatment plant — not to upstream collection system owners. Regional sewer networks therefore function as single hydraulic systems but are regulated as separate entities.
When untreated wastewater escapes before reaching the plant, those overflows become unpermitted discharges. Regulators have relied heavily on direct enforcement — often through consent decrees — to impose inspection, rehabilitation, and CMOM-style obligations on collection system owners.
In practice, enforcement has become the mechanism for managing system-wide risk where permitting does not reflect how sewersheds operate.
Stewardship in Practice
For large regional utilities, many of these stewardship frameworks are already embedded — often shaped by years of federal enforcement, dedicated compliance staff, and long-term capital programs. Risk-based inspections, asset inventories, and preventive maintenance are now part of normal operations.
For smaller and mid-sized systems, the picture is often very different.
Limited staffing, aging infrastructure, and tight rate bases can push utilities into a reactive cycle — responding to breaks, backups, and enforcement actions as they arise, with little capacity for long-range planning. In those environments, emergencies tend to dictate priorities, even when everyone recognizes the need for prevention.
From a legal standpoint, that reactive posture matters.
When overflows occur without a documented prevention program, regulators are left with little to evaluate beyond the violation itself. By contrast, utilities that can show risk-based inspections, prioritized rehabilitation, and consistent maintenance are often better positioned in enforcement discussions — not because failures disappear, but because diligence, planning, and corrective action are visible.
Shifting toward stewardship doesn’t require building a compliance department overnight. It starts with understanding where failures occur most often, aligning inspection and maintenance with actual risk, and making capital decisions based on system vulnerability rather than crisis response.
When those pieces come together, priorities change. Preventive work becomes easier to justify. Limited dollars stretch further. And coordination across connected systems becomes more intentional instead of reactive.
Utilities don’t have to do this alone. In Maryland, the Maryland Department of the Environment provides technical assistance and financing through the Clean Water State Revolving Fund. The U.S. Environmental Protection Agency offers asset management and CMOM guidance. And for smaller systems in particular, the Maryland Rural Water Association provides hands-on operational support.
None of this eliminates failures entirely. But steady, risk-based stewardship changes both how often problems occur — and how utilities are positioned when regulators inevitably get involved.
Watershed Legal Counsel advises private clients and government instrumentalities in environmental and natural resources matters, serves as outside general counsel for mission-driven enterprises in the environmental sector, and provides strategic legal services that help organizations manage change. Founder Jennifer Wazenski is a Maryland attorney who has practiced environmental and natural resources law since 1991. She served as Principal Counsel to the Maryland Department of Natural Resources from 2010 through 2021, and, prior to that, Deputy Counsel to the Maryland Department of the Environment.
Disclaimer: Attorney advertising. The information provided at this site is for general purposes only. It is not, nor is it intended to be, legal advice.
© 2026 Watershed Legal Counsel. All rights reserved. Photos licensed from Adobe Stock Photos; Sewershed Illustration from US EPA website.
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