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Montgomery County(3 more)
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| Field | Local Montgomery County Montgomery County Engineering Department, 501 N. Thompson St., Suite 405, Conroe, TX 77301 |
|---|---|
| Permit | |
| Permit / Authorization | Montgomery County Drainage Permit |
| Submit To | Montgomery County Engineering Department, 501 N. Thompson St., Suite 405, Conroe, TX 77301 |
| Lead Time | 4–8 weeks depending on project complexity and completeness of submittal |
| Application Method | Submit paper or electronic application to the Montgomery County Engineering Department. Drainage plans must be signed and sealed by a licensed Texas PE. |
| Fee | Contact agency for current fee schedule |
| Water Quality | |
| Impervious Cover Limit | No countywide blanket limit; site-specific detention requirements triggered by increases in impervious cover. Local MUDs and HOA deed restrictions may impose additional limits. |
| On-Site Treatment Required | No |
| Detention Required | Yes — Post-development peak discharge must not exceed pre-development conditions for the 2-, 10-, 25-, and 100-year storm events per the Montgomery County Drainage Criteria Manual (post-Harvey 2019 edition). Freeboard and emergency spillway requirements apply to all detention basins. |
| Turbidity / Discharge Standard | Disturbed areas must comply with TPDES Construction General Permit (TXR150000) effluent limits. No separate county turbidity numeric standard; SWPPP BMPs and weekly inspections required per state CGP. |
| SWPPP | |
| SWPPP / Local Plan Required | No local plan |
| PE Stamp Required | No |
| Inspections | |
| Inspection Requirements | Montgomery County Engineering Department conducts drainage inspections during construction and a final inspection prior to release of the drainage permit. Contractor must request each inspection with at least 48 hours notice. County may require third-party inspection reports for larger projects (typically >10 acres). As-built survey confirming detention basin volumes must be submitted prior to final release. |
| Inspector Qualification | Inspections performed by or under the direct supervision of the county's licensed engineers. Third-party inspectors must be a licensed Texas PE or registered professional land surveyor (RPLS) where as-built surveys are required. |
| Design & Zones | |
| Local Design Manual | Montgomery County Drainage Criteria Manual (2019 Post-Harvey Edition) |
| Special Overlay Zones | San Jacinto River Watershed / Post-Harvey Drainage Improvement Zone, FEMA Special Flood Hazard Area (AE, AO, and X-Shaded Zones), Municipal Utility District (MUD) Overlay |