Mobile Car Wash Permit Requirements in Silver Spring, MD

Complete permit and license guide for starting a mobile car wash in Silver Spring, Montgomery County, Maryland.

Verified 2026-09-02 9 stops $150–$500 est. 2–4 weeks to obtain business license and comply with stormwater regulations
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Not legal advice. Requirements may change — always verify with your local government authority before applying. Key agencies and fees on this page were re-checked against official government sources on .

Federal — start here

2 stops

  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

    FreeImmediate (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

State of Maryland

3 stops

  1. Maryland Business Registration

    Register with SDAT via Maryland Business Express (LLC Articles of Organization $100; trade name $25, filed with SDAT — not a county clerk). All Maryland LLCs/corporations must also file the SDAT Annual Report each year ($300, due April 15).

    Official government source

    $100 LLC filing; $25 trade name; + $300/year SDAT Annual Report1–7 business days

  2. Maryland Environmental / Stormwater Compliance

    Mobile car wash operations generate wastewater containing detergents, oils, and grime. Maryland regulations, consistent with the federal Clean Water Act, prohibit discharging wash water to storm drains, gutters, or waterways. Use a containment mat and recovery system or direct wash water to a sanitary sewer. Contact the Maryland Department of the Environment (MDE) Water and Science Administration for compliance and any required discharge permits.

    Official government source

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

  3. Maryland Sales Tax Registration

    Car washing and auto detailing services are not subject to Maryland sales tax. If you sell tangible products (air fresheners, detailing products), register with the Comptroller of Maryland (free) and collect the 6% state sales tax on those goods only. Maryland has no local sales taxes.

    Official government source

    Free–$25Immediate–1 week (online)

City of Silver Spring / Montgomery County

4 stops

  1. No Local General Business License Required

    Silver Spring is an unincorporated community in Montgomery County with no city government, so there is no city business license for mobile car wash or detailing operations. Neither Maryland nor Montgomery County requires a general business license, and mobile detailing services are not among the specific activities licensed by the Clerk of the Circuit Court. No local general business license is required.

    Official government source

    $0 — no general business license existsNot applicable

  2. Montgomery County Stormwater / Wastewater Discharge Compliance

    Montgomery County (which includes Silver Spring) prohibits commercial vehicle-washing operations, including portable detailing, from discharging wash water to storm drains, gutters, or waterways. Operators must direct all wash water to the sanitary sewer or capture and contain it (e.g., berms/mats and a wet/dry vacuum) for proper off-site disposal. The county Department of Environmental Protection enforces these rules; violators can be fined up to $500 per incident.

    Official government source

    No permit fee — compliance requirementOngoing compliance

  3. Montgomery County OEMHS — Hazardous Materials Registration (if above thresholds)

    Mobile detailing operations in Montgomery County that store or use hazardous substances (e.g., solvents, degreasers) above the county thresholds of 5 gallons or 50 pounds must register under the Hazardous Materials Use Permit program run by the Office of Emergency Management and Homeland Security (OEMHS) — not an 'Environmental Health' department. Businesses using hazardous chemicals must maintain Safety Data Sheets (SDS) and comply with proper storage and disposal requirements; Fire and Rescue enforces permit compliance.

    Official government source

    Annual registration fee by facility category: $100 light use, $250 general use, $400 high use, $1,000 SARA1–2 weeks

  4. Montgomery County Home Occupation Rules (if operating from residence)

    Mobile car wash operators who store their vehicle, equipment, and supplies at a Silver Spring residence are governed by Montgomery County zoning, not a city permit. A no-impact home occupation — no non-resident employees coming to the site and no more than 5 customer vehicle visits per week — is permitted by right with no registration; register with the county Department of Permitting Services only if you exceed those thresholds. Storing hazardous chemicals above 5 gallons or 50 pounds triggers county OEMHS hazardous-materials registration.

    Official government source

    $0 for a no-impact home occupation; $522.36 DPS home occupation zoning permit fee if registration is required (FY27 schedule)No approval needed for no-impact; DPS registration decided within about 10 days

Terminus

Open for business — est. $150–$500 · 2–4 weeks to obtain business license and comply with stormwater regulations

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