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 Texas TCEQ | Local Montgomery County Montgomery County Engineering Department, 501 N. Thompson St., Suite 405, Conroe, TX 77301 |
|---|---|---|
| Permit | ||
| Permit / Authorization | Construction General Permit (TXR150000) | Montgomery County Drainage Permit |
| Submit To | TCEQ | Montgomery County Engineering Department, 501 N. Thompson St., Suite 405, Conroe, TX 77301 |
| Lead Time | Must file NOI and receive authorization before construction begins | 4–8 weeks depending on project complexity and completeness of submittal |
| Application Method | Online via TCEQ Water Quality ePay system | Submit paper or electronic application to the Montgomery County Engineering Department. Drainage plans must be signed and sealed by a licensed Texas PE. |
| Fee | $325 for projects disturbing < 5 acres; $525 for ≥ 5 acres | Contact agency for current fee schedule |
| Water Quality | ||
| Impervious Cover Limit | No statewide 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 | Not specified at state level | No |
| Detention Required | Not specified at state level | 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 | Not specified in CGP; discharges must not cause or contribute to violations of water quality standards | 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 | Yes | No local plan |
| PE Stamp Required | No | No |
| Inspections | ||
| Inspection Requirements | Every 14 days and within 24 hours of a rainfall event producing ≥ 0.5 inches | 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 | Stormwater Pollution Prevention Plan (SWPPP) Inspector — no state license required but must be knowledgeable | 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 | N/A — state level | Montgomery County Drainage Criteria Manual (2019 Post-Harvey Edition) |
| Special Overlay Zones | N/A — see local jurisdictions | 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 |