Maryland SWPPP Compliance
Quick Facts for Maryland
- Authority: Maryland Dept. of the Environment (MDE) (MD)
- Permit: General Permit for Construction (20-CP)
- Inspection Schedule: Every 4 business days OR weekly + post-rain
- Rain Trigger: 0.25 inches or more in 24h
Regulation Overview
Permitting Authority
Official Permit
Inspection Frequency
Rain Event Trigger
State vs. Federal (EPA)Varies
Two Inspection Schedule Options
The weekly option carries an event-driven inspection requirement; the four-business-day option does not use that same post-rain cadence. Project and receiving-water conditions can add requirements.
Inspection Requirements for Maryland
Construction projects that disturb one or more acres—or smaller sites that are part of a larger common plan—commonly require stormwater permit coverage in Maryland. Eligibility, exemptions, local approvals, and project-specific conditions vary, so confirm coverage under the General Permit for Construction (20-CP) before construction begins.
Operational Insight
This schedule combines recurring and event-driven duties. Record rainfall or discharge events independently from the weekly calendar and document why each event did or did not trigger an inspection.
Specific State Nuance
The 20-CP permit allows inspections at least once every four business days, or once every seven calendar days plus within 24 hours after a storm producing 0.25 inch or more in 24 hours. MDE may require more frequent inspections for discharges to sensitive waters.
Common BMPs Checked in Maryland
- Silt Fences & Perimeters
- Construction Entrances
- Concrete Washout Areas
- Inlet Protection
- Stockpile Management
- Dust Control
Continue your field review
Check common controls in the BMP field guide, then compare them with your approved SWPPP.
Regulatory Filing
Agency Contact
Official Resources
Why Go Digital?
Handwritten logs are hard to read and easy to lose. Digital reports provide a timestamped, geo-tagged audit trail that protects your business.