If you disturb an acre of ground, you work under the Construction General Permit. EPA has proposed rewriting it, and it just gave the industry 15 more days to argue about the draft.
The agency published the proposed 2027 CGP in the Federal Register on Aug. 3, replacing the 2022 permit that expires Feb. 16, 2027. Comments were due Sept. 2. After multiple requests, including one from NAHB on Aug. 6 asking for exactly 15 days, EPA extended the deadline to Sept. 17. The agency also ran a webinar on the draft on Aug. 18 and has posted the slide deck.
Who this actually binds
EPA is the NPDES permitting authority in a fairly short list of places: Massachusetts, New Hampshire, New Mexico, the District of Columbia, Puerto Rico, most Indian Country lands and certain territories and federal facilities.
That understates the reach. States write their own construction stormwater permits, and most of them use the federal CGP as the template. What EPA finalizes here tends to show up in state permits over the following renewal cycle, which is why contractors in states with delegated programs should still be reading the draft.
Coverage triggers at one acre of land disturbance, or smaller sites inside a larger common plan of development totaling an acre.
The San Francisco fix
The substantive change is the removal of the broad “as necessary to meet water quality standards” discharge language. EPA proposes replacing it with conditions tied to observable discharge characteristics.
That’s the agency’s response to the Supreme Court’s decision in City and County of San Francisco v. EPA, which held that permits can’t impose open-ended obligations to achieve a water quality outcome without telling the permittee what to actually do. For a site superintendent, the practical difference is between a permit condition you can inspect against and one a plaintiff can litigate against after the fact.
Stabilization gets more flexible
Three changes here, all in the contractor’s favor:
- The existing stabilization exception for arid, semi-arid and drought-stricken areas would become available year-round rather than seasonally.
- Operators could delay stabilization when unforeseeable frozen ground or snow accumulation halts construction for at least 14 days.
- The core deadlines survive unchanged: 7 days where more than five acres are disturbed at once, 14 days at five acres or less.
EPA is also taking comment, though it hasn’t proposed it, on allowing weekly rather than daily turbidity monitoring for certain longer-term dewatering where initial samples stay below benchmark. Anyone running a long dewatering operation should weigh in on that one, because it’s the difference between a daily sampling crew and a weekly visit.
Why it matters
Erosion and sediment control is the compliance obligation that touches more construction sites than any other federal environmental rule, and it’s enforced against superintendents and site foremen rather than against corporate compliance departments.
NAHB has previously argued for a best-management-practice approach and for the word “minimize” rather than “prevent” in turbidity-control design language. That’s the association’s stated position rather than a filed comment, and the comment docket is EPA-HQ-OW-2025-0760.
Big earthwork jobs are where this bites hardest. USACE’s $1.13 billion Prado Dam spillway rebuild and the Rock & Roll Hall of Fame expansion, which pulled roughly 300 truckloads of soil off a lakefront landfill site, are both the kind of job where a stabilization deadline is a scheduling input, not a footnote.