Illinois SWPPP requirements (2026)
Can I write my own SWPPP in Illinois?
Illinois accepts a SWPPP prepared by the operator — no professional licence is required to write it. Basis: NPDES ILR10 (effective 2023-09-22), Part IV.
Who may prepare the plan in Illinois
A storm water pollution prevention plan shall be developed for each construction site covered by this permit. Storm water pollution prevention plans shall be prepared in accordance with good engineering practices.
Our reading of NPDES ILR10 (effective 2023-09-22), Part IV:Illinois requires the plan to follow good engineering practices; PE, CPESC and CESSWI appear only in the inspection-personnel definition.
How Illinois differs from the federal baseline
States with no NPDES authorisation of their own run on the EPA 2022 Construction General Permit, whose "qualified person" definition is a knowledge and skill threshold that the operator's own staff can meet — it names no licence. Illinois's own permit adds no licence, exam or credential above that baseline, so there is nothing further to satisfy here.
Federal baseline: EPA 2022 CGP (no state NPDES authorisation), Appendix A definitions.
What that means for a 1–5 acre site
Below one disturbed acre, federal construction general permit coverage is usually not required at all unless the site is part of a larger common plan of development. Check whether you need a SWPPP before you pay for one.
Above five disturbed acres you are outside the 1–5 acre range this tool was built for. Several states change their preparer requirements above five acres, so re-read your state permit before relying on a self-prepared plan.
County and city rules are not covered here. This page answers the state-level question only; a local authority can require more, and that is for you to check.
Illinois SWPPP questions
- Can I write my own SWPPP in Illinois?
- Illinois accepts a SWPPP prepared by the operator — no professional licence is required to write it.
- Does Illinois's permit name any preparer qualification at all?
- Illinois requires the plan to follow good engineering practices; PE, CPESC and CESSWI appear only in the inspection-personnel definition. The clause is NPDES ILR10 (effective 2023-09-22), Part IV, read on 2026-08-03.
- Which acreage counts — the whole site or the disturbed part?
- Disturbed area is what these clauses measure, and it is what the questionnaire asks for — a 40-acre parcel with 1.5 disturbed acres is a 1.5-acre project for this purpose. Total site area is asked for separately and does not decide the answer.
- Does Illinois run its own permit, or the federal one?
- On its own. Illinois issues the construction general permit or implementing regulation this page was read from — NPDES ILR10 (effective 2023-09-22), Part IV. The federal permit still sets what a SWPPP has to contain; the state document is what decides who may write it here.
- What does a SWPPP cost in Illinois?
- A consultant-prepared SWPPP for a small site is commonly quoted at around $497 — a market figure inherited from our own competitor review, which we have not re-verified. SwpppDraft intends to charge $99 for the plan and $149 with the forms pack, and is not open for sale yet, so nothing can be bought here today. Illinois's permit does not require you to buy anything in order to prepare the plan — what it costs you is the time to answer questions about your own site.
- Do county or city rules apply on top of this?
- They can, and this page does not cover them. The scan behind it answered the state-level question only, so a county or municipality in Illinois may require more — a stamped plan, a local permit, or a different form — even where the state permit does not. Ask the authority that will receive your paperwork before you write the plan, not after.
- Is there anything else to know about Illinois?
- The Illinois permit was read for this classification, but no stable public address for the permit document itself was recorded. The address here is the agency site, not the permit.
Build a SWPPP for a site in Illinois
The questionnaire and the generator run in your browser and produce a watermarked draft. Checkout is not open, so nothing can be charged.
Source and verification
NPDES ILR10 (effective 2023-09-22), Part IV. The Illinois permit was read for this classification, but no stable public address for it was recorded. State-law information on this page was verified on 2026-08-03. County and city rules are not covered. Illinois in context:its row in the 50-state table.
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.