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Hays County (Unincorporated)(3 more)

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Field	Local Hays County (Unincorporated) Hays County Development Services
Permit
Permit / Authorization	Floodplain Development Permit / Drainage Review
Submit To	Hays County Development Services
Lead Time	Plan review typically 2–4 weeks
Application Method	Submit via Hays County Development Services at 712 S. Stagecoach Trail, Suite 1033, San Marcos, TX 78666 or online portal at hayscountytx.com
Fee	Contact agency for current fee schedule
Water Quality
Impervious Cover Limit	Portions of unincorporated Hays County are within the Edwards Aquifer Recharge and Contributing Zones — EAA permit required for development over the aquifer; impervious cover caps apply as required by EAA rules
On-Site Treatment Required	No
Detention Required	Yes — Detention required to limit post-development peak flows to pre-development levels for 2-, 5-, 10-, 25-, and 100-year storms per Hays County Drainage Design Standards; applies in unincorporated areas and ETJs where cities lack their own standards
Turbidity / Discharge Standard	No numeric NTU limit; discharges must comply with TCEQ TXR150000 and not degrade Blanco River, Onion Creek, Plum Creek, or San Marcos River
SWPPP
SWPPP / Local Plan Required	Yes — SWPPP per TCEQ TXR150000; drainage report required for county permits
PE Stamp Required	Yes
Inspections
Inspection Requirements	Hays County Development Services inspects development in unincorporated areas. County capacity has been stressed by rapid growth.
Inspector Qualification	No county-specific certification required beyond TCEQ SWPPP requirements
Design & Zones
Local Design Manual	Hays County Drainage Design Standards
Special Overlay Zones	Edwards Aquifer Recharge Zone, Blanco River Floodplain, Onion Creek Floodplain, City ETJ Areas