Q1 2026 sent a fairly clear message on water. The question is whether compliance teams are reading it that way.
If you've been watching EPA's moves on PFAS drinking water limits, the picture is genuinely complicated right now — and complicated tends to be where compliance risk hides.
EPA has indicated it intends to revise wastewater discharge standards under the Clean Water Act for PFAS-manufacturing facilities in early 2026, and separately plans to propose a rule requiring companies applying for discharge permits to monitor their wastewater for PFAS and report results. At the same time, the agency is seeking to roll back limits on four specific PFAS compounds while maintaining restrictions on PFOA and PFOS — the most widespread and toxic of the group.
For EHS professionals, this is not a signal to wait. The regulatory direction on PFAS is tightening at the discharge end even as some drinking water limits are being contested in court. Organizations with industrial wastewater streams that have not yet assessed PFAS exposure are operating with less runway than they probably realize. Q2 is when those wastewater monitoring proposals are likely to take shape, and facilities that haven't done baseline characterization will be behind before the comment period closes.
The Lead and Copper Rule compliance picture heading into Q2 is one of the clearer enforcement signals in the water space right now. EPA concluded over 300 enforcement cases related to Lead and Copper Rule service line inventories in FY 2025. A signal that the agency was not treating that requirement as a paperwork formality.
The inventory submission deadline was, in many ways, a test. What comes next is harder: corrective action timelines, updated sampling location criteria, and public notification requirements under the Lead and Copper Rule Improvements. Facilities that treated the inventory step as a compliance box to check without building out the follow-on remediation plan are going to find Q2 uncomfortable.
The practical issue isn't whether your organization has lead service lines. It's whether you can demonstrate — on paper, to a regulator — exactly where they are, what your replacement timeline looks like, and what you've communicated to affected populations. That documentation posture matters more in an active enforcement environment than it did even 18 months ago.
This one is moving faster than most compliance teams have registered. EPA proposed a rule in January 2026 to revise the Clean Water Act Section 401 certification process, with the agency working toward a final rule in spring 2026.
The proposal is framed around streamlining permitting and limiting state authority to delay or block federally permitted projects on water quality grounds. That framing matters less for day-to-day compliance than the practical effect: the revised rule would eliminate state authority to require certification review for certain discharges not directly into federal waters, and limit consideration of impacts such as wetland effects or downstream pipeline impacts that states had previously been able to evaluate under the 2023 rule.
For EHS and project development teams, this is a structural shift that cuts both ways. On one hand, some certification timelines that have been stalled at the state level may clear faster. On the other, the narrowed scope means certain impacts may no longer trigger state review — creating gaps in due diligence that could surface as liability later. Organizations with projects currently in or entering the 401 certification pipeline need legal and environmental counsel looking at this now, not after the final rule drops.
The Clean Water Act requires industrial facilities, construction sites, and municipal separate storm sewer systems to have measures in place to prevent pollution from being discharged with stormwater into nearby waterways. That requirement is not new. What is new is the enforcement posture around it.
Stormwater tends to be the water compliance category that gets deferred — permit renewals that sit, inspection records that lag, spill prevention plans that haven't been updated since a facility changed operations. It is also, consistently, one of the areas where regulators find the easiest cases to make. If PFAS and lead are getting the headline attention right now, stormwater is where enforcement teams often fill their dockets.
A quick self-assessment heading into Q2:
Those are not hypothetical questions — they're the first things an inspector asks.
The through-line across all of these areas is documentation and defensibility. Regulators are not discovering new categories of concern in 2026 — they are intensifying scrutiny on known ones. PFAS characterization, lead service line remediation planning, 401 certification scope changes, and stormwater plan currency are all areas where the gap between having a program and being able to demonstrate that program is where enforcement exposure lives.
Q2 will move quickly. The organizations that use the next few weeks to close documentation gaps rather than wait for inspection pressure will be in a materially different compliance posture by June.
