Does a SWPPP have to be stamped by an engineer?

In nine states, yes, for a 1–5 acre site. In the other 41 the permit either asks for a "qualified person" — a knowledge threshold, not a credential — or says nothing about the preparer at all. Two of those 41 want an open-enrolment certificate first.

Where does this classification come from?

Each state was read from its current construction general permit or the regulation that implements it, on 2026-08-03, and the clause number and key sentence are printed on that state's page. Where no public text existed, the state is marked unverified rather than guessed at.

Who can prepare a SWPPP?

For a 1–5 acre construction site, 40 of the 50 states let the operator prepare the SWPPP themselves; nine require a licensed professional and one (Missouri) publishes no permit text we could read, so we treat it as a no.

Source: SwpppDraft 50-state preparer-requirement table, from a scan of all 50 construction general permitsVerified 2026-08-03

The five answers a state permit can give

Every state permit was read for one question: does it put a qualification on the person who writes the plan? The answers fall into five shapes, and which shape your state is in decides everything else.

A licence, state-wide — a professional engineer or an equivalent credential must prepare or stamp the plan. Eight states, plus South Carolina above its acreage line.
A licence, but only if a site condition fires — five states, where the trigger is usually water within 50 feet, a steep slope, or a project type.
An open-enrolment certificate — two states, where the course is open to anyone but has to be done first.
A "qualified person" — a knowledge threshold the operator can meet, with no third-party credential behind it.
Nothing at all — the permit puts the duty on the operator and says no more.

Why the licence question is not the same as the inspection question

A state can let you write the plan and still require a credentialed person to inspect the site. Several do. The scan behind this site answered the preparer question only, so check the inspection clause of your own permit separately before you assume one answer covers both.

Questions people ask

Does a SWPPP have to be stamped by an engineer?: In nine states, yes, for a 1–5 acre site. In the other 41 the permit either asks for a "qualified person" — a knowledge threshold, not a credential — or says nothing about the preparer at all. Two of those 41 want an open-enrolment certificate first.
Where does this classification come from?: Each state was read from its current construction general permit or the regulation that implements it, on 2026-08-03, and the clause number and key sentence are printed on that state's page. Where no public text existed, the state is marked unverified rather than guessed at.

The states this question turns on

Texas SWPPP requirements — Texas requires the SWP3 to be developed and implemented by the primary operator; the permit contains no PE, CPESC or licensing language for preparation.
California SWPPP requirements — California requires the SWPPP to be developed by a Qualified SWPPP Developer, and QSD status presupposes an existing PE, CPESC, CPSWQ, landscape-architect or geologist credential.
New York SWPPP requirements — New York splits by project type, not acreage: Table 1 projects (single-family homes, residential subdivisions, agricultural buildings, underground utilities, trails) can be self-prepared, while commercial development and other Table 2 projects need a stormwater management practice component and therefore a licensed professional — with no acreage floor.
South Carolina SWPPP requirements — South Carolina requires a licensed engineer, landscape architect or Tier B land surveyor to stamp the plan only above 2 disturbed acres; at or below 2 acres a sketched plan with no seal is accepted.
Montana SWPPP requirements — Montana requires SWPPP preparers to hold a certification from a DEQ-approved course; the course has no degree or licence prerequisite.

All 50 states, in one table

The documents this affects

Texas SWPPP (the plan itself)

What we are, and what stays your responsibility

SwpppDraft is a document generation tool. It does not provide engineering services, legal services, or compliance consulting, and no engineer or attorney reviews what it produces.
Everything in the document is built from the site facts you enter. Checking that those facts are right, and that the resulting plan fits your project, is yours to do.
We do not file anything on your behalf, we do not certify or endorse your compliance, and we accept no liability for what happens when you use the document.
State-level requirements carry the date we verified them. County and city rules are not covered — some local jurisdictions require a licensed preparer even where the state does not, and you have to check that yourself.
When the product opens, our total liability will be capped at the amount you paid us. Today that amount is zero, because nothing is for sale.