What the Construction General Permit Covers, and What It Doesn't
EPA's permit, your state's permit, and an individual permit all answer to "the CGP." Confusing them is how operators file under the wrong document.
"The construction general permit" gets used as if it names one document. It doesn't. EPA issues a construction general permit. Most states issue their own, separately. Some sites need an individual permit instead of either. And the industrial permit next door, the MSGP, gets pulled into the same sentence often enough that it's worth separating out too. None of this is exotic; it's the ordinary shape of the Clean Water Act's permitting scheme, and it resolves cleanly once you know which document is actually in front of you.
Three documents, one nickname
Start with what the CGP is for. Any construction activity disturbing one acre or more, or part of a larger common plan of development or sale that will disturb one acre or more, needs NPDES permit coverage for its stormwater discharges. That coverage comes as a general permit in the overwhelming majority of cases, because a general permit lets a regulator authorise many similar operators under one document instead of writing bespoke terms for each site.
EPA's own construction general permit is the 2022 CGP, effective 17 February 2022 and running to 16 February 2027. It is a federal document, and it only issues coverage directly in the places EPA itself administers the NPDES programme: Massachusetts, New Hampshire, New Mexico, the District of Columbia, most U.S. territories, most Indian country, and a short list of federal facilities. If your site sits outside that list, EPA's CGP is not the permit that covers you, no matter how often the phrase gets used generically.
A state-issued construction general permit covers everyone else, which in practice is most operators in the country. Forty-seven states and a territory are authorised to run their own NPDES programme. An authorised state must write a permit at least as protective as EPA's, but the result is its own legal instrument, issued by its own agency, with its own permit number and its own text to read. Texas is the clean example: TCEQ issues TXR150000, the Texas Construction General Permit, under the state's TPDES programme. It is not EPA's 2022 CGP wearing a Texas label. It is a different document that happens to share a family resemblance because both descend from the same federal minimum.
Two operators can both say "we're under the CGP" and be describing two different agencies, two different permit numbers, and in places, two different inspection frequencies.
An individual permit is the third shape, and it exists precisely because a general permit assumes your site looks enough like everyone else's to be covered by generic terms. EPA's own guidance on the distinction is direct about when that assumption breaks down: an individual permit is "written to reflect the site-specific conditions of a single discharger," and for construction sites it is "rarely used," reserved "most often for very large projects or projects located in sensitive watersheds." A discharge to an especially sensitive water, a site large or unusual enough that generic terms genuinely don't fit, or a state permitting authority that simply declines to cover a given project under its general permit, can all push a site out of general permit coverage and into an individual one.
How to tell which one governs your site
The honest answer is that it depends on where the site sits and what it discharges to, which is exactly the lookup our own screening tool exists to do rather than leave you to guess. It resolves jurisdiction first, and only then reasons about thresholds and requirements, because getting the wrong document at step one poisons everything after it. If you want to read the jurisdiction picture directly, our state permit hub lists which agency issues coverage in each state, and the Texas and California pages show what that looks like once written up in full, agency, permit number, and source cited.
If you're still at the stage of working out whether a plan is required at all before worrying about which agency's version of the CGP applies, Do I need a SWPPP answers that narrower question first.
CGP vs MSGP: different activity, different permit
A second confusion runs sideways rather than up and down: mixing up the construction general permit with the Multi-Sector General Permit. Both are NPDES general permits for stormwater. That's where the similarity ends. The CGP covers land disturbance, active construction. The MSGP covers ongoing industrial activity at existing facilities across 29 sectors, from manufacturing to scrap recycling to certain transportation facilities. A site can touch both in sequence: a facility gets built under CGP coverage, then operates under MSGP coverage once construction ends. It is not the same document doing double duty; it's a handoff between two.
The two also don't move in sync. As we covered in our post on the MSGP's status, EPA's Multi-Sector General Permit expired and new facilities currently cannot get coverage under it while a replacement is finalised. The 2022 CGP is unaffected by that and remains open for new coverage through its own 2027 expiry. Assuming the two permits share a timeline, an issuer, or an eligibility test is a fast way to apply the wrong rule to the wrong activity.
| Construction General Permit | MSGP | Individual permit | |
|---|---|---|---|
| Covers | Stormwater from active land disturbance | Stormwater from ongoing industrial activity, 29 sectors | Whatever discharge the specific permit describes |
| Who issues it | EPA (unauthorised states/territories/tribal land) or the state agency (most states) | EPA where it is the permitting authority; some states run their own industrial permit | The relevant NPDES permitting authority, federal or state |
| Typical trigger | One acre or more disturbed, or part of a common plan of development reaching one acre | Industrial activity in a covered sector with a stormwater discharge | Large or sensitive project the general permit isn't written to fit |
| How you apply | Notice of Intent under the applicable general permit | Notice of Intent under the applicable MSGP or state equivalent | Individual application reviewed and drafted for your site specifically |
Why this matters beyond terminology
Getting the wrong document isn't a paperwork nuisance; it changes the substance of what you owe. A SWPPP built to EPA's 2022 CGP language cites the wrong sections and the wrong inspection frequency if a state permit actually governs. An NOI filed to EPA when the state runs its own authorised programme goes nowhere, because EPA is not the permitting authority there and has no application to receive. And a general permit filing on a site that actually needs an individual permit isn't a shortcut, it's a filing the agency can reject once it looks at the project.
"The vast majority of discharges associated with construction activity are covered under NPDES general permits." That's the default. It's also exactly why the exceptions, the individual permit and the wrong-jurisdiction general permit, are the cases that catch people out.
None of this is a reason to treat the question as unanswerable. It's a reason to answer it in the right order: confirm the jurisdiction first, confirm the agency second, and only then start filling in a plan. That's the order our determination engine works in, and it's the order that keeps the document you produce citing the permit that will actually be read against it.
Screen your site and see which agency's construction general permit actually governs it, with the source cited.
Screen a site freeFAQ
Is the construction general permit the same in every state?
No. EPA's 2022 CGP applies directly only where EPA administers the NPDES programme. Most states run their own authorised programme and issue their own construction general permit, which must be at least as protective as EPA's but is a separate document with its own number and its own agency.
Who issues the construction general permit in my state?
It depends on whether your state is NPDES-authorised. If it is, the state environmental agency issues its own CGP, as TCEQ does in Texas with TXR150000. If it isn't, EPA issues coverage directly. Our state permit hub lists the issuing agency by state.
What's the difference between the CGP and the MSGP?
The CGP covers stormwater from active construction and land disturbance. The MSGP covers stormwater from ongoing industrial activity at existing facilities across 29 sectors. They're both NPDES general permits, but different regulated activities, different Notices of Intent, and currently different statuses: the CGP runs to 2027, while the MSGP has expired for new coverage.
When do I need an individual permit instead of the CGP?
Individual permits for construction stormwater are uncommon. EPA reserves them for very large projects or discharges to particularly sensitive watersheds, or where a permitting authority declines general permit coverage for a specific site. Most operators, including large ones, are correctly covered under a general permit.
Does a state CGP have to match EPA's permit exactly?
No, only match or exceed it in protectiveness. States can and do set different inspection frequencies, different documentation requirements, and different eligibility details, while still meeting the federal floor set by EPA's construction and development effluent limitation guidelines.
This guide is general compliance guidance, not legal or engineering advice, and it is not a permit. To see what applies to your own site, use the free screening, or see how the same engine works from your own code or an AI agent.
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