Mobile Car Wash Permit Requirements in San Antonio, TX

1. EIN (Employer Identification Number)

   Required if you have employees or operate as an LLC or corporation. Free from the IRS, obtained instantly online.

   Official government source

   Free·Immediate (online application)

   Free

   Immediate (online application)

2. EPA Stormwater Compliance — Clean Water Act Section 402

   Mobile car wash operations that discharge wash water are subject to the federal Clean Water Act. The EPA's National Pollutant Discharge Elimination System (NPDES) prohibits discharge of polluted wash water to storm drains or waterways without a permit. Most mobile operators achieve compliance by using containment systems and disposing of water via sanitary sewer. Larger operations (e.g., fleet washing facilities) may require an NPDES permit.

   Official government source

   Free (containment equipment: $200–$1,500)·Before first wash

   Free (containment equipment: $200–$1,500)

   Before first wash

1. Texas Business Registration

   Mobile car wash and auto detailing businesses operating in Texas must register with the Texas Secretary of State if structured as an LLC, corporation, or partnership. Sole proprietors using a trade name must file a DBA registration. An LLC is recommended to protect personal assets, as mobile operations working at customers' properties carry inherent liability.

   Official government source

   $300 (LLC or for-profit corporation certificate of formation); $750 limited partnership; $25 nonprofit corporation; $25 SOS assumed name certificate for entities; sole proprietors file an assumed name certificate with the county clerk (county fee varies, typically ~$15-$25)·1–7 business days

   $300 (LLC or for-profit corporation certificate of formation); $750 limited partnership; $25 nonprofit corporation; $25 SOS assumed name certificate for entities; sole proprietors file an assumed name certificate with the county clerk (county fee varies, typically ~$15-$25)

   1–7 business days

2. Texas Environmental / Stormwater Compliance

   Mobile car wash operations generate wastewater containing detergents, oils, and road grime. Under the federal Clean Water Act and the Texas Pollutant Discharge Elimination System (administered by the Texas Commission on Environmental Quality, TCEQ), this wash water may not be discharged to storm drains, gutters, or waterways. Use a containment mat and recovery system (wet/dry vacuum or pump) or route wash water to a sanitary sewer. Contact TCEQ and your city's stormwater program for compliance guidance.

   Official government source

   Typically no state permit for compliant containment/disposal; fees apply only if a specific TCEQ permit or local discharge authorization is required·1–4 weeks (if permit required; otherwise immediate with self-compliance)

   Typically no state permit for compliant containment/disposal; fees apply only if a specific TCEQ permit or local discharge authorization is required

   1–4 weeks (if permit required; otherwise immediate with self-compliance)

3. Texas Sales Tax Registration

   Car washing and detailing labor is generally NOT subject to Texas sales tax - motor vehicle repair and maintenance services are excluded from Texas's taxable services (Comptroller pubs 94-113 and 96-259). You pay sales tax on your supplies (soap, wax, towels) when you buy them. A free Sales and Use Tax Permit from the Texas Comptroller of Public Accounts is needed only if you sell taxable tangible goods (e.g., retail products) to customers.

   Official government source

   Free (permit needed only if selling taxable goods)·Immediate–1 week (online)

   Free (permit needed only if selling taxable goods)

   Immediate–1 week (online)

1. City of San Antonio — No General Business License Required

   The City of San Antonio does NOT require a general business license, business tax certificate, or occupational license. Only activity-specific permits (Certificate of Occupancy for commercial premises, health permits for food, etc.) apply. Mobile car wash operators must instead comply with stormwater discharge rules (capture and properly dispose of wash water).

   Official government source

   None·1–2 weeks

   None

   1–2 weeks

2. San Antonio Stormwater / Wastewater Discharge Compliance

   San Antonio prohibits the discharge of mobile car wash wastewater into storm drains, gutters, or waterways. Wash water contains detergents, oils, and road grime that are harmful to local waterways. Operators must: (1) use a portable containment berm or mat to capture runoff, (2) vacuum up wash water with a wet/dry vac or pump, and (3) dispose of collected water at an approved sanitary sewer access point or licensed disposal facility. The city's Public Works or Stormwater division may conduct inspections. Violations may result in fines.

   $0–$150 (inspection or registration fee, if required)·1–3 weeks (self-certify compliance before operating)

   $0–$150 (inspection or registration fee, if required)

   1–3 weeks (self-certify compliance before operating)

3. Bexar County Environmental Health — Chemical Use Registration (if applicable)

   No Bexar County chemical-use registration program for mobile detailing was found. Operators using degreasers or solvents must follow TCEQ waste-management rules, keep Safety Data Sheets under OSHA hazard-communication requirements, and prevent discharges to storm drains. Contact the city/county environmental offices if in doubt.

   None identified·1–2 weeks

   None identified

   1–2 weeks

4. San Antonio — Home Occupation (no permit required)

   San Antonio does not issue a home occupation permit. Under UDC §35-378, home occupations are allowed in any dwelling subject to performance standards (residential character, signage, traffic). No certificate of occupancy is required for a home occupation. Note UDC §35-378 prohibits certain occupations at the home (including vehicle service or repair); a mobile operation performing all services off-site and merely basing at home should confirm its setup with Development Services.

   Official government source

   None·1–3 weeks

   None

   1–3 weeks

Official Sources

• San Antonio Business Licensing
• Texas Environmental Quality — Water Programs
• EPA NPDES — Stormwater Discharges
• IRS EIN Application

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