Your Construction Stormwater Permit Expires February 16, 2027: SWPPP, Inspection, and Coverage Requirements Before the Clock Runs Out

If your company operates construction sites where EPA is the permitting authority, your stormwater permit has an expiration date, and it is closer than most site teams realize. EPA’s 2022 Construction General Permit (CGP), the federal authorization that lets a construction site legally discharge stormwater, expires at 11:59 p.m. on February 16, 2027 (EPA - 2022 CGP). Every construction stormwater permit and SWPPP requirement tied to that permit runs on the same clock: the Stormwater Pollution Prevention Plan, the Notice of Intent, the inspection schedule, and the stabilization deadlines. This guide walks through what the permit actually demands, and what has to happen before your coverage lapses.

Land-disturbing construction is regulated under the Clean Water Act through the National Pollutant Discharge Elimination System (NPDES) stormwater program. Any project that disturbs one or more acres, or that disturbs less than one acre but is part of a larger common plan of development or sale totaling one acre or more, must obtain permit coverage before breaking ground. The 2022 CGP was issued in the Federal Register on January 24, 2022 (87 FR 3522) and took effect February 17, 2022. Below, we answer the questions site teams and compliance managers ask most, in order.

What is the EPA Construction General Permit (CGP)?

The CGP is EPA’s National Pollutant Discharge Elimination System (NPDES) general permit that authorizes stormwater discharges from construction sites where EPA is the permitting authority. The current 2022 CGP took effect February 17, 2022 (87 FR 3522) and covers sites disturbing one or more acres. It sets SWPPP, inspection, stabilization, and reporting requirements under the Clean Water Act.

Rather than issue a separate individual permit to every construction site in the country, EPA uses one general permit that operators opt into. The trade for that convenience is that the operator takes on the full set of standard conditions: build the plan, file the notice, control the site, inspect it, document everything, and stabilize on schedule. The permit is the baseline. Nothing in it is optional once you are covered.

Does my construction project need a stormwater permit?

Yes, if the project disturbs one or more acres, or disturbs less than one acre but is part of a larger common plan of development or sale that totals one acre or more (EPA - Getting Coverage under the CGP). Below that threshold, coverage generally is not required unless a state rule is stricter or the site drains to a sensitive water.

The “common plan” language is where projects get caught. A single lot in a subdivision, or one phase of a multi-phase build, is pulled into permit coverage when the total disturbed area across the plan reaches one acre. Two parties often share responsibility: the party with operational control over construction plans and specifications, frequently the owner or developer, and the party with day-to-day operational control, frequently the general contractor. Both may need to file. If you are unsure who holds the permit obligation on a given site, that ambiguity is itself an enforcement exposure worth resolving before the first dozer arrives.

Do I need a SWPPP for my construction site?

Yes. Every site covered by the CGP must prepare and implement a site-specific Stormwater Pollution Prevention Plan before discharging (2022 CGP Final Permit). The SWPPP documents the site layout, identifies pollutant sources, and specifies the erosion, sediment, and pollution-prevention controls, the best management practices, that the operator will install, inspect, and maintain throughout construction.

A SWPPP is not a boilerplate template with the project name swapped in. It has to reflect the actual site: the drainage patterns, the receiving waters, the phasing, the controls chosen for that terrain and that soil. It also has to stay current. As grading advances and controls change, the plan changes with them, and the document lives on-site or is readily available for the duration of the work. A stale SWPPP that no longer matches the ground is one of the most common findings an inspector writes up.

How do I get coverage under the Construction General Permit?

Prepare the SWPPP first, then submit a complete Notice of Intent (NOI) through EPA’s NeT electronic reporting system and wait out the permit’s review and waiting period before starting to discharge (EPA - Submitting an NOI under the CGP). The NOI certifies eligibility and describes the site’s construction activity and discharges.

The order matters. The SWPPP comes before the NOI, and the NOI plus its waiting period comes before any land-disturbing discharge. Skipping the wait, or breaking ground before the NOI clears, means you are discharging without coverage, which is the single most serious construction stormwater violation. When the site reaches final stabilization and coverage is no longer needed, the operator files a Notice of Termination (NOT) to close it out. Coverage that is never terminated keeps the operator on the hook for a site they have long since left.

How often are construction stormwater inspections required?

Under the 2022 CGP, operators choose between two routine inspection schedules: at least once every 7 calendar days, or once every 14 calendar days plus within 24 hours of any storm producing 0.25 inch or more of rain (CGP Part 4.2) (2022 CGP Final Permit). Sites discharging to sediment- or nutrient-impaired waters, or waters needing enhanced antidegradation protection, face more frequent inspection requirements.

The inspection itself is only half the obligation. The documentation is the other half. An inspection that happens but is not recorded, or a corrective action that is identified but never logged and closed, reads to a regulator the same as an inspection that never happened. On a superintendent’s rain-delayed week, the 7-day clock does not pause. Building the inspection cadence into the site’s standing routine, with a named responsible person and a real record, is what keeps a documentation gap from becoming a penalty.

What are the stabilization deadlines under the CGP?

Operators must initiate stabilization immediately, no later than the end of the next work day, in any area where construction has permanently ceased or will sit inactive for 14 or more calendar days, and complete it within 14 calendar days of initiation (7 days for sites disturbing more than 5 acres at once or discharging to sensitive waters) (CGP Part 2.2.14, Table 2) (2022 CGP Final Permit). Shorter stabilization deadlines apply for sites discharging to sensitive or impaired waters. Missing stabilization deadlines is one of the most common construction stormwater findings.

“Temporarily ceases” is the phrase that trips crews up. If an area will sit inactive for 14 or more days, stabilization must start by the end of the next work day after work stops there, not when the project ends. A graded pad that will sit idle for three weeks between phases needs stabilization initiated immediately, not left bare to erode through the next rain. Where the site drains to an impaired water, the clock is shorter still. Tracking which areas have gone quiet, and when, is the practical discipline that keeps stabilization deadlines from slipping past unnoticed.

What is the penalty for a construction stormwater violation?

Clean Water Act violations, including discharging without permit coverage, carry federal civil penalties up to $68,445 per day per violation for penalties assessed on or after January 8, 2025 (40 CFR 19.4; 90 FR 1375). Because the cap is per day per violation, an unaddressed problem across a rainy month compounds quickly, and EPA can pursue administrative or judicial penalties.

This is the number most contractors misread. The $68,445 is not a one-time fine you pay and move on from. It is a per-day, per-violation ceiling, which means a skipped inspection routine or a missed stabilization deadline does not cost you once, it accrues while the problem sits open. That structure is what makes documentation gaps expensive well before a site ever causes a measurable discharge. The routine lapse, not the catastrophe, is what most often gets a site cited, and the per-day math is why the cost climbs faster than most budgets assume.

When does the 2022 Construction General Permit expire?

The 2022 CGP and every operator’s authorization to discharge under it expire at 11:59 p.m. on February 16, 2027 (EPA - 2022 CGP). EPA published the proposed 2027 CGP for public comment on August 3, 2026 (91 FR 48862), and the final permit is expected before the current one lapses. Operators active across that date must re-authorize to stay covered.

This is the deadline that drives everything else in this article. A permit that expires does not quietly renew itself. Any operator whose site is active on both sides of February 16, 2027 needs a plan to carry coverage across the transition, which means reading the proposed 2027 CGP’s terms, tracking the final permit, and re-filing under it. Sites that ignore the reissuance risk a coverage gap, and a discharge during a coverage gap is a discharge without a permit.

Does the federal EPA CGP apply in Kansas, Oklahoma, Texas, Missouri, or Nebraska?

Generally no. All five are NPDES-authorized states that issue their own construction stormwater permits, for example Texas TPDES permit TXR150000, renewed March 5, 2023, and Oklahoma’s OKR10 (EPA - Authorization Status). EPA’s federal CGP applies in those states on Indian country and certain federal lands, and in Oklahoma and Texas it also covers oil and gas-related construction activity outside the state agency’s authority. Operators must follow their state’s permit, which uses EPA’s CGP as a baseline but adds state-specific terms.

This is the multi-state contractor’s real problem. A SWPPP built to satisfy Texas TCEQ (TCEQ - Stormwater General Permit for Construction Activities) is not a SWPPP that satisfies Oklahoma’s ODEQ, Kansas’s KDHE, Missouri’s DNR, or Nebraska’s DEE. Each state runs its own authorized program with its own thresholds, filing systems, monitoring, and documentation. One template cannot cover a five-state footprint. For the Oklahoma-specific picture, Oklahoma’s OKR10 permit carries its own NOI and SWP3 requirements at the state level; this national piece is the companion to that state-specific picture.

What changed in the 2025 modification to the CGP?

On April 15, 2025 (90 FR 15653), EPA expanded CGP eligibility to construction on all Lands of Exclusive Federal Jurisdiction and finalized revised water quality-based effluent limitations for those newly eligible activities, tying compliance to the condition of the discharge itself rather than to whether the receiving water meets water quality standards.

That change implements the Supreme Court’s 2025 ruling in City and County of San Francisco v. EPA, which held that the Clean Water Act does not authorize “end-result” permit limits that make an operator responsible for the overall condition of the receiving water. The honest read for a construction operator is narrow: the courts trimmed the narrative water-quality end of the permit, but the operational core did not move. The SWPPP requirement, the NOI, the routine inspection cadence, and the next-work-day stabilization rule are all stable and strictly enforced. Nothing in the 2025 modification relaxed the one-acre threshold or the day-to-day compliance framework.

Are small construction sites under one acre exempt, and what is a rainfall erosivity waiver?

Sites disturbing less than one acre and not part of a larger common plan generally do not need CGP coverage. Small sites of one to under five acres that will occur during a period of low rainfall erosivity may qualify for a waiver from permit coverage instead of filing a full NOI, based on the EPA rainfall-erosivity factor calculation (EPA - Getting Coverage / Waivers).

The waiver is a real option, but it is a calculated one, not an assumption. It applies to a specific size band and depends on the timing of the work landing in a low-erosivity window, documented through EPA’s rainfall-erosivity factor. Guessing wrong, treating a site as exempt when it does not actually clear the calculation, puts the operator back in the discharging-without-coverage category. When the numbers are close, run the calculation and keep the documentation rather than relying on a rule of thumb.

What do I need to do before the 2022 CGP expires in February 2027?

Confirm your coverage status, keep your SWPPP and NOI current, and prepare to re-authorize under the 2027 CGP so coverage does not lapse (EPA - 2022 CGP). The proposed 2027 permit published on August 3, 2026; watch EPA’s CGP page for the final permit, and budget time to update your SWPPP to any new permit terms before the February 16, 2027 deadline.

In practical terms, that means five things for operators active across the transition: inventory every site currently covered and confirm each NOI is accurate; keep each SWPPP matched to actual site conditions; read the proposed 2027 CGP’s delta against the 2022 terms and track the final permit; schedule the re-authorization filing so it clears before February 16, 2027 rather than after; and, for anything on federal or tribal land, confirm the site is not left in a coverage gap during the handover. None of this is difficult on its own. What makes it hard is doing it across multiple sites and multiple states while the field work keeps moving.

Where iSi fits

Keeping construction stormwater coverage continuous across a five-state footprint, through a permit reissuance, is exactly the kind of surrounding compliance work that pulls a safety manager off the judgment calls they are actually there to make. iSi supports environmental compliance and stormwater SWPPP work across 40 states: preparing and updating site-specific SWPPPs, filing NOIs and terminations, building the inspection and documentation cadence the permit requires, and tracking the 2027 CGP reissuance so coverage does not lapse. If your team is carrying construction stormwater compliance on top of everything else, that is the logical place to start a conversation. Call iSi Environmental at (888) 264-7050 to talk through your sites before the February 2027 deadline gets closer.