The Complete SWPPP Requirements Checklist: Every Federal Trigger and Deadline

Most SWPPP guidance answers one question well and leaves the rest to you: how often to inspect, what the plan must contain, when a filing expires. Nobody puts the whole sequence on one page. This is that page. It runs the actual order a construction project meets these requirements, from working out whether your site needs coverage at all to filing the paperwork that ends it, with the deadline, the permit citation, and, where we have already written the long answer, a link straight to it. Read it top to bottom before you break ground, or jump straight to the stage you are at.

Does the site even need coverage

Coverage under EPA's 2022 Construction General Permit is triggered by disturbing one acre or more of land, or by disturbing less land that is part of a larger common plan of development or sale which will, in total, disturb an acre or more (Part 1.1.2). The second trigger is the one that catches people, because it can pull a quarter acre lot into coverage on the strength of a subdivision plan nobody on site has read. There is a third route too: EPA can designate a site of any size as needing coverage under 40 CFR 122.26, regardless of acreage or common plan status, so being under both thresholds is not an automatic clearance. We cover exactly how the acreage test works, and where it commonly goes wrong, on its own page: The half acre lot that needs a permit.

Choosing the right permit and filing the NOI on time

Once coverage applies, work out which permit actually governs. EPA's Construction General Permit (CGP) applies only where EPA is the permitting authority, a short list of states, federal facilities in a handful more, and most US territories and Indian country. Everywhere else a state runs its own construction general permit, which must be at least as protective as the federal floor and is very often stricter. We cover the confusion this causes on its own page: Construction General Permit, explained.

Under the federal permit the plan has to exist before the paperwork does: "You must develop a SWPPP consistent with Part 7 before submitting your NOI for coverage under this permit" (Part 1.4.1). The Notice of Intent then carries its own deadline, separate from the plan's: a new site operator must submit a complete and accurate NOI at least 14 calendar days before commencing construction activities (Part 1.4.3, Table 1). File late and you are disturbing land without authorisation, whatever state your plan is in. NOIs are filed electronically through EPA's NPDES eReporting Tool unless your regional office has granted a waiver (Part 1.4.2). The same 14-day clock applies when a site changes hands mid-project: the incoming operator must submit a new NOI at least 14 calendar days before the transfer takes effect, and the outgoing operator files its own Notice of Termination to close out its share of responsibility (Part 1.4.4).

What the plan itself must contain

The permit sets a specific contents list: every site operator, the stormwater team, the nature of the construction activity, a site map, the controls you will use, your inspection schedule and your corrective action record, all under Part 7. A template can carry the headings and the boilerplate. It cannot carry your site map, your maximum disturbed acreage or your receiving water answer, because those are facts about your project rather than facts about the form. The full section by section answer, and the parts a template structurally cannot fill in, is here: Why a SWPPP template is not a SWPPP.

Who is allowed to prepare and sign it

The federal permit itself does not gate who may write the plan, but a number of states do, through a Qualified SWPPP Developer credential, a professional engineer stamp, or an equivalent, and the requirement varies enough that an identical document can be compliant in one state and a redraft-required rejection in the next. Settle this before anyone starts drafting: Who may prepare a SWPPP.

How often you have to inspect

Under the federal permit you choose between inspecting every seven calendar days, or every 14 days plus within 24 hours of a storm producing 0.25 inches or more of rain, unless your site discharges to an impaired or highly protected water. In that case an override applies and both conditions stack, permanently, whether or not you knew the water was on the list. There is also a reduction available in seasonally dry areas, earned only by documenting the dry period dates in the plan itself. The full decision tree, including where people get the override wrong, is here: How often you have to inspect a construction site.

Stabilisation deadlines

Once earth disturbing work on a portion of the site stops and will not resume for 14 or more days, the clock starts: stabilisation must be initiated no later than the end of the next business day (Part 2.2.14a). Completion then has to follow within 14 calendar days of initiation where five acres or less are disturbed at any one time, or within seven calendar days where more than five acres are disturbed at once (Part 2.2.14a, Table 2), a shorter deadline for the bigger footprint, not a longer one. A discharge to a sensitive water can force the seven day deadline regardless of acreage. Stabilisation itself means implementing and maintaining measures such as seeding protected by erosion controls, sodding, mulching, erosion control blankets, hydromulch or gravel, whatever combination actually holds the soil on your site (Part 2.2.14). The full mechanics, including the seasonally dry variant, live here: Stabilisation deadlines on a construction site.

Corrective actions when something fails

The triggers for a corrective action are broader than a broken silt fence: a control that was never installed or was installed incorrectly, a discharge that is not meeting water quality standards, a prohibited discharge, or the same routine maintenance fix needed three or more times at the same location all count (Parts 5.1.1 through 5.1.5). Finding one obliges you to act immediately, taking all reasonable steps to address the condition as soon as you find it (Part 5.2.1a), then fixing it on one of two clocks: by the close of the next business day if the problem does not need a new or replacement control or a significant repair, or within seven calendar days of discovery if it does (Part 5.2.1b, 5.2.1c). Miss the second deadline and the permit still gives you a documented infeasibility path, but only if you use it before the seven days run out. The full breakdown is here: Corrective action deadlines under the CGP.

Record retention

Inspection reports and the corrective action log both have to be kept for at least three years from the date your permit coverage expires or is terminated, not three years from when each record was written (Parts 4.7.4 and 5.4.4). On a project that runs for several years, the earliest inspection report on file has to survive the whole build plus three more years after that. Electronic records are fine, provided they stay as accessible to an inspector as a paper copy at the site would be. That is separate from keeping the plan itself current while coverage is live: a current copy of the SWPPP has to stay on site or somewhere easily accessible throughout construction, with the date, author and a summary of every modification logged as it happens (Parts 7.3 and 7.4.2). The full answer, stage by stage, is here: How long you have to keep SWPPP records.

Ending it: the Notice of Termination

Coverage does not expire quietly. You must file a Notice of Termination within 30 calendar days after one of the conditions in Part 8.2 occurs, most commonly final stabilisation and site clean up, and until that NOT is submitted you remain bound by every condition of the permit (Part 8.4). Authorisation then ends at midnight of the calendar day a complete NOT is submitted, not the day the crew left site (Part 8.5). An unfiled NOT on a finished site is coverage nobody is fulfilling, and it is still coverage.

The number that actually applies to your site

This page is a federal-permit checklist because the federal numbers are the ones with a single, citable source, and because most sites need to understand the federal baseline before they can spot where their own state departs from it. But most construction sites in the country are not on the federal CGP at all. Most states run their own construction general permit, with their own inspection frequency, their own stabilisation deadlines and their own filing paths, and the only responsible way to know which apply to a given site is to check the permit that actually governs it, not to assume the federal one does because it is the one that is easy to find. EPA's own construction stormwater programme page says as much: the CGP applies only where EPA is the permitting authority, and every other state runs its own programme under the same Clean Water Act framework.

See which permit governs your state here: Construction general permit by state. Or run the determination on your own site and get the answer with the citation behind it: Screen a site free.