City of Laredo
City of Laredo Public Works / Engineering Department
CityMS4 Phase IIVerified 2026-03
Local Permit / Authorization
- Permit Required
- Yes
- Permit Name
- Grading / Drainage Permit
- Submit To
- City of Laredo Public Works / Engineering Department
- Lead Time
- Plan review typically 2–4 weeks
- Application Method
- Submit via City of Laredo Development Services at 1110 Houston St., Laredo, TX 78040 or online portal
- Fee
- Contact agency for current fee schedule
Water Quality Standards
- Impervious Cover Limit
- No citywide impervious cover cap; drainage systems must accommodate design storm flows; Rio Grande and Zacate Creek floodplains impose fill and elevation restrictions
- On-Site Treatment Required
- No
- Detention Required
- Yes
- Detention Standard
- Detention required to limit post-development peak flows to pre-development levels for 2-, 10-, 25-, and 100-year storms per City of Laredo Drainage Design Criteria; arid climate with intense summer thunderstorms requires conservative storm routing
- Turbidity Standard
- No numeric NTU limit; discharges must comply with TCEQ TXR150000 and not degrade Rio Grande water quality; Rio Grande is a critical water supply and international waterway
Local SWPPP / Drainage Plan
- Local Plan Required
- Yes
- Plan Name
- SWPPP per TCEQ TXR150000; drainage report required for local permit
- PE Stamp Required
- Yes
Drainage study prepared by a Texas PE required for grading permits. Laredo's location on the Rio Grande means stormwater management has international implications — discharge quality affects the Rio Grande and downstream users in Mexico. IBWC (International Boundary and Water Commission) exercises jurisdiction over the Rio Grande and coordination may be required for projects near the river.
Local Inspection Requirements
- Requirements
- City of Laredo Engineering Department inspects grading permits at rough grading and final stabilization. Summer monsoon season (July–September) can produce intense thunderstorms requiring active BMP maintenance.
- Inspector Qualification
- No city-specific certification required beyond TCEQ SWPPP requirements
Special Overlay Zones
Rio Grande Floodplain (FEMA AE/AO Zones)
Trigger: Development within FEMA-mapped 100-year floodplain along the Rio Grande
Restriction: Floodplain development permit required from City of Laredo Floodplain Administrator; no net fill without compensatory storage; elevation certificate required; IBWC coordination required for work that may affect Rio Grande flow or international flood risk
Zacate Creek Floodplain
Trigger: Development within FEMA-mapped floodplain along Zacate Creek, which flows through central Laredo to the Rio Grande
Restriction: Floodplain development permit required; Zacate Creek has experienced severe flash flooding; detention and erosion protection required; creek corridor is subject to rapid flow velocities during storm events
International Boundary Zone (IBWC Jurisdiction)
Trigger: Projects within the International Boundary and Water Commission (IBWC) right-of-way or potentially affecting Rio Grande hydraulics
Restriction: IBWC authorization required; no construction that obstructs or alters Rio Grande flow without IBWC approval; federal and international treaty obligations apply
Port of Laredo / International Trade Zone
Trigger: Construction at or near port of entry facilities, international bridges, or customs inspection areas
Restriction: Coordinate with CBP, GSA, and City of Laredo for projects affecting port infrastructure drainage; industrial and commercial truck traffic creates significant sediment tracking concerns
Design Manual
- Manual Name
- City of Laredo Drainage Design Criteria
Official Resources
Jurisdiction Notes
Laredo is the largest inland port in the United States by trade volume, with thousands of commercial trucks crossing the border daily. The city's arid climate (averaging ~20 in/year rainfall) means storms are infrequent but can produce intense flash flooding in low-lying areas and along creek channels. The Rio Grande has complex international regulatory implications for any stormwater discharge that reaches the river. The International Boundary and Water Commission (IBWC) has treaty obligations governing Rio Grande water quality that extend to construction activities in the floodplain. Stormwater management in Laredo must account for both water quantity (flash flood protection) and water quality (international treaty compliance).
Remember: These local requirements are in addition to the TCEQ state construction permit. Both must be satisfied before breaking ground.
Disclaimer: This information is provided for general reference only. Always verify requirements directly with City of Laredo Public Works / Engineering Department and the agency website before beginning construction.