The U.S. Environmental Protection Agency has published its proposed 2027 National Pollutant Discharge Elimination System Construction General Permit for public review and comment.
The proposal is designed to replace the current 2022 Construction General Permit, which is set to expire in February 2027, and introduces several targeted regulatory changes.
Developers, builders, contractors, and trade associations have until September 17, 2026 to submit public comments on the proposed permit under an recently extended deadline.
When finalised, the permit will directly affect construction site operators seeking coverage in areas where EPA administers the NPDES programme, including Massachusetts, New Hampshire, New Mexico, and the District of Columbia.
The proposal also carries broader implications, as states frequently look to the federal permit when developing or renewing their own construction stormwater general permits.
One of the most significant proposed changes concerns how the permit addresses the Supreme Court’s 2025 ruling in City and County of San Francisco v. EPA, in which the Court held the Clean Water Act does not authorise EPA to impose “end-result” permit requirements making permitholders responsible for the overall quality of receiving waterbodies.
EPA acknowledged that its 2022 permit “includes language that could be considered the type of end-result provision addressed in the San Francisco decision,” and has now proposed more specific discharge-linked conditions in its place.
A consequential administrative change would also require operators submitting a Notice of Intent to provide either a full Stormwater Pollution Prevention Plan, a webpage where the plan remains accessible throughout permit coverage, or a site map alongside a signed certification.
Although several states already require SWPPP submission alongside a Notice of Intent, EPA has not previously mandated this at the federal level, meaning the change would give the agency significantly earlier access to operator documentation.
The proposal introduces new requirements for sediment basin stabilisation, stipulating that operators must stabilise embankments and side slopes before stormwater is first directed to a newly constructed basin, following findings of sediment releases from insufficiently stabilised structures.
EPA is also seeking to streamline certain requirements, including clarifying that perimeter controls are only necessary in areas that could receive runoff from disturbed land, and offering more flexibility for sites in arid, semi-arid, or drought-affected regions.
On dewatering monitoring, EPA is requesting input on whether longer-term continuous operations should qualify for less frequent turbidity checks, with one option allowing weekly monitoring after three days of continuous discharge if early average turbidity remains within acceptable benchmarks.
The agency is expressly requesting comment on the SWPPP submission requirement, the revised water quality conditions stemming from the San Francisco ruling, turbidity reporting for multi-operator sites, and potential monitoring flexibility for extended dewatering operations.
EPA has stated it does not currently plan to hold a public hearing, though interested parties may formally request one under federal regulatory procedures before the September 17, 2026 comment deadline closes.