Compare Regulations
Compare state baseline against local requirements in a single view
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Compare state baseline against local requirements in a single view
Rows with an amber indicator differ across selections.
| Field | State New York NYSDEC | Local Westchester County Individual city/town/village building departments / Westchester County Soil & Water Conservation District |
|---|---|---|
| Permit | ||
| Permit / Authorization | SPDES General Permit for Stormwater Discharges from Construction Activity (GP-0-25-001) | Municipal Building Permit with Stormwater Management / County Soil & Water Review |
| Submit To | NYSDEC | Individual city/town/village building departments / Westchester County Soil & Water Conservation District |
| Lead Time | Electronic NOI (eNOI) required; NYSDEC issues a Letter of Authorization (LOA) specifying the authorized construction start date | Municipal permit review 2–6 weeks; county review concurrent for projects in county drainage or watershed areas |
| Application Method | Online via NYSDEC's eDEC system — electronic eNOI submission now mandatory (paper no longer accepted) | Building permits via individual municipality; county-level reviews for projects impacting county drainage infrastructure or NYC watershed |
| Fee | $2,250 flat fee for most projects (one of the higher fees nationally) | Municipal permit fees per project scope; county review fees may apply |
| Water Quality | ||
| Impervious Cover Limit | No statewide limit | No countywide cap; post-construction management per NYSDEC MS4 permit; NYC East of Hudson watershed areas have stricter thresholds |
| On-Site Treatment Required | Not specified at state level | Yes |
| Detention Required | Not specified at state level | Yes — Manage the first 1 inch of rainfall on-site per NYS Stormwater Management Design Manual; watershed-specific requirements may impose stricter controls |
| Turbidity / Discharge Standard | Not specified as a numeric standard; discharges must not cause or contribute to violations of water quality standards. Turbidity benchmarks apply for sites near 303(d)-listed waters. | Must comply with NYSDEC SPDES CGP; Long Island Sound TMDL for nitrogen applies to northern watershed |
| SWPPP | ||
| SWPPP / Local Plan Required | Yes | Yes — SWPPP per NYSDEC; local stormwater management plans per municipal ordinances |
| PE Stamp Required | Yes | Yes |
| Inspections | ||
| Inspection Requirements | Every 7 days and within 24 hours of a storm event producing ≥ 0.5 inches of rainfall (or ≥ 0.25 inches if site is near a 303(d) listed water body) | Municipal inspections at permit milestones. NYC DEP conducts watershed inspections in East of Hudson areas. Post-construction BMPs require maintenance agreements. |
| Inspector Qualification | Trained Contractor (TC) for routine inspections; Qualified Inspector (QI) for sites ≥ 5 acres or near sensitive water bodies. QI certification required through NYSDEC-approved training. | NYSDEC-approved QI/TC per SPDES CGP; no additional county certification |
| Design & Zones | ||
| Local Design Manual | N/A — state level | NYS Stormwater Management Design Manual / NYC Watershed Regulations (for applicable areas) |
| Special Overlay Zones | N/A — see local jurisdictions | NYC East of Hudson Watershed, Long Island Sound Watershed, Hudson River Watershed |