Frequently Asked Questions
FAQs
What is the purpose of the SWPPP?
A SWPPP sets out how a construction project will control erosion, sediment, and other pollutants in stormwater runoff, and how compliance will be documented. It's the governing document for the site's obligations under the State Water Board's Construction General Permit (Order 2022-0057-DWQ).
Does my project need a SWPPP?
It depends on how much soil you're disturbing. Projects disturbing one acre or more are covered by the Construction General Permit and require a SWPPP. Projects under one acre typically fall to the local municipality and require a Water Pollution Control Program (WPCP) instead. One important exception: if your project is part of a larger common plan of development or sale, the acreage of the whole plan controls, not just your parcel — which pulls many sub-acre sites into the state permit. DSW prepares both, and we'll confirm which pathway applies before you commit to anything.
Are Inspections required?
Yes. The Construction General Permit requires weekly inspections of BMPs regardless of weather, plus inspections tied to forecast precipitation: before a qualifying precipitation event, during extended events, and after the event ends. Risk Level 2 and 3 sites carry additional sampling and analysis obligations.
Can anyone perform SWPPP inspections?
No. Inspections must be performed by qualified personnel. Some inspection work may be carried out by trained site personnel working under the direction of a Qualified SWPPP Practitioner (QSP), with the QSP retaining oversight and sign-off. QSD site inspections must be performed by a certified Qualified SWPPP Developer, and SWPPP preparation and amendment require a QSD as well. DSW holds both certifications.
Who is responsible for SWPPP compliance?
The Legally Responsible Person — usually the property owner or developer — carries the permit obligation and the liability. Contractors are bound to follow the SWPPP through their contracts, but enforcement action goes to the LRP. That's why documentation matters as much as field performance.
What happens if I don’t comply with SWPPP?
Noncompliance can result in Administrative Civil Liability from the Regional Water Quality Control Board, and penalties accrue per day of violation. Federal penalty maximums are adjusted upward for inflation annually, so the figures climb every year. Beyond the money, enforcement actions become part of your record and can affect prequalification on future work.