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MS4 Stormwater Outfall & BMP Inspection (NPDES)
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Municipal separate storm sewer system inspection of outfalls for illicit discharge and of structural stormwater BMPs for function under the NPDES MS4 permit.
NPDES MS4 Permit (CWA)EPA 40 CFR 122.34Construction & Post-Construction Stormwater
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Inspection Setup
- Outfall / BMP asset ID *
- Inspection date *
- Is the inspection during dry weather (>48-72 hr since last significant rain) for illicit discharge screening? *
Outfall Illicit Discharge Screening
- Is there any dry-weather flow at the outfall? *
- Is the discharge free of odor, color, turbidity, oil sheen, or floatables? *
- Are field screening parameters (if flow present) within expected ranges?
- Is the outfall structure free of scour, erosion, or structural damage?
Structural BMP Condition
- Is the BMP (detention/retention/bioretention/filter) free of excessive sediment accumulation? *
- Are inlet and outlet structures unobstructed and functioning? *
- Is the BMP free of erosion, bypass channeling, or embankment damage?
- Is vegetation established and maintained (for vegetated BMPs)?
Housekeeping & Pollution Sources
- Is the drainage area free of illegal dumping, staining, or exposed pollutant sources?
- Is trash / debris accumulation within acceptable limits?
- Are nearby industrial/commercial connections free of evidence of improper discharge to the storm system?
Findings & Follow-up
- Is maintenance, cleanout, or corrective action required? *
- Is an IDDE investigation / enforcement referral warranted for suspected illicit discharge? *
- Photograph outfall/BMP condition
MS4 Stormwater Outfall & BMP Inspection (NPDES) 체크리스트 전체 다운로드
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