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Los Angeles County (Unincorporated)(3 more)
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| Field | Local Los Angeles County (Unincorporated) Los Angeles County Department of Public Works |
|---|---|
| Permit | |
| Permit / Authorization | Grading Permit with LID Standards Compliance |
| Submit To | Los Angeles County Department of Public Works |
| Lead Time | Plan review 4–8 weeks; LID compliance reviewed as part of grading/building permit |
| Application Method | Online via LA County Department of Public Works; LID plan submitted with permit package |
| Fee | Grading permit fees based on earthwork volume; LID plan review included |
| Water Quality | |
| Impervious Cover Limit | No countywide cap; projects creating ≥ 500 sq ft of new or replaced impervious surface in unincorporated areas trigger LID requirements (one of the lowest thresholds in CA) |
| On-Site Treatment Required | Yes |
| Detention Required | Yes — Retain the 85th-percentile 24-hour storm on-site; if infeasible, biofiltration of 1.5× the design volume. County's LID Standards Manual governs sizing and selection. |
| Turbidity / Discharge Standard | Must comply with state CGP and LA County MS4 Permit (Order R4-2012-0175 as amended) receiving water limitations |
| SWPPP | |
| SWPPP / Local Plan Required | Yes — Erosion and Sediment Control Plan (construction); LID Plan / Standard Urban Stormwater Mitigation Plan (post-construction) |
| PE Stamp Required | Yes |
| Inspections | |
| Inspection Requirements | County inspects grading and erosion control during construction. Post-construction LID facilities require recorded covenants and maintenance agreements. Annual self-inspection and periodic county verification. |
| Inspector Qualification | QSP/QSD per state CGP; no additional county certification |
| Design & Zones | |
| Local Design Manual | LA County LID Standards Manual |
| Special Overlay Zones | Significant Ecological Area (SEA), Hillside Management Area, Santa Monica Bay Watershed |