Mobile Car Wash Permit Requirements in Cheyenne, WY

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. Wyoming Business Registration

   Mobile car wash and auto detailing businesses operating in Wyoming must register with the Wyoming 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

   $100 LLC Articles of Organization; $100 trade name (DBA) — WY Secretary of State fee schedule·1–7 business days

   $100 LLC Articles of Organization; $100 trade name (DBA) — WY Secretary of State fee schedule

   1–7 business days

2. Wyoming Environmental / Stormwater Compliance

   Mobile car wash operations generate wastewater containing detergents, surfactants, oils, and road grime. Wyoming environmental regulations — consistent with federal Clean Water Act requirements — prohibit discharge of this wash water to storm drains, street gutters, or waterways. Operators must use a wastewater containment mat and recovery system (wet/dry vacuum or pump), or must ensure wash water flows to a sanitary sewer inlet. Operators using hazardous cleaning solvents or degreasers may require a state permit. Contact the Wyoming Department of Environmental Quality for compliance guidance.

   Official government source

   Free–$200 (registration or permit fee, if required)·1–4 weeks (if permit required; otherwise immediate with self-compliance)

   Free–$200 (registration or permit fee, if required)

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

3. Wyoming Sales Tax Registration

   Car washing and auto detailing services are typically subject to sales tax in Wyoming. Register with the Wyoming Department of Revenue to obtain a seller's permit and collect the appropriate state and local sales tax from customers. Keep records of all transactions and remit taxes on the required schedule.

   Official government source

   $60 one-time sales/use tax license fee (W.S. § 39-15-106(a))·Immediate–1 week (online)

   $60 one-time sales/use tax license fee (W.S. § 39-15-106(a))

   Immediate–1 week (online)

1. Cheyenne General Business License

   Cheyenne does not require a city business license for a mobile car wash/detailing business. Cheyenne has NO general business license. Municipal Code section 5.04.030 enumerates the only licensed business types (e.g., barber/beauty shops, food service, liquor, massage, body art, garages/car lots/service stations, pawnbrokers, secondhand dealers, transient merchants/solicitors, towing, tree maintenance, nicotine retail, taxis, private security). Businesses not on that list need no City of Cheyenne business license; confirm any edge case with the City Clerk.

   Official government source

   $0 — no city license required.·1–2 weeks

   $0 — no city license required.

   1–2 weeks

2. Cheyenne Stormwater / Wastewater Discharge Compliance

   Discharging wash water to storm drains is prohibited under Cheyenne's stormwater (illicit discharge) rules; capture and dispose of wash water to the sanitary sewer. No registration or permit fee program for mobile washing was identified — treat this as a compliance obligation, not a permit.

   No permit/registration fee identified; compliance obligation only.·1–3 weeks (self-certify compliance before operating)

   No permit/registration fee identified; compliance obligation only.

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

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

   No county chemical-use registration program for detailing businesses was found. Keep SDS sheets and follow label/storage/disposal law (federal/state), but do not expect a Laramie County registration requirement — confirm with Cheyenne-Laramie County Public Health if using unusual solvent quantities.

   Official government source

   Likely $0 — no registration program found.·1–2 weeks

   Likely $0 — no registration program found.

   1–2 weeks

4. Cheyenne Home Occupation Permit (if operating from residence)

   Storing a work vehicle and supplies at home may be subject to Cheyenne's home-occupation zoning rules — confirm with Cheyenne Planning & Development.

   Unverified.·1–3 weeks

   Unverified.

   1–3 weeks

Official Sources

• Cheyenne Business Licensing
• Wyoming Environmental Quality — Water Programs
• EPA NPDES — Stormwater Discharges
• IRS EIN Application

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