A power washing rig is a mobile setup that carries a pressure washer, water tank, hose reel, and accessories to clean on-site. Rigs range from simple trailer setups to fully outfitted trucks for commercial work. This guide covers rig types, equipment, setup, safety, and profitability considerations for USA operators.
What Is a Power Washing Rig?
A power washing rig combines all needed equipment on a mobile platform. It eliminates the need for a nearby spigot and lets you work at remote locations efficiently. A typical rig includes: pressure washer (gas/commercial), water tank, transfer pump (if needed), hose reel, surface cleaner, chemicals, and safety gear.
Rig Types
| Rig Type | Capacity | Best For | Notes |
|---|---|---|---|
| Truck bed rig | 50–150 gal | Residential, small jobs | Affordable, uses existing truck |
| Utility trailer rig | 100–300 gal | Mid-volume commercial | Easy to park, separate from truck |
| Enclosed trailer rig | 150–500 gal | Full-time, all-weather | Secure storage, professional look |
| Flatbed truck rig | 200–1000 gal | Large commercial, fleets | Highest capacity, highest cost |
| Van rig | 25–100 gal | Light duty, urban | Compact, parking friendly |
Core Equipment
- Pressure washer: Gas, belt-drive, triplex pump preferred for commercial.
- Water tank: Poly, IBC tote, or custom; sized for GPM and jobs.
- Transfer pump: Pushes water from tank to washer if not gravity-fed.
- Hose reel: 100–200 ft high-pressure hose reel saves time.
- Surface cleaner: Speeds concrete cleaning.
- Chemical tank/injector: For soaps/degreasers with proper containment.
- Wand/gun/nozzles: Complete set for various surfaces.
- Water filtration: Inlet strainer and sediment filter protect pump.
- Safety gear: PPE, first aid, spill kit.
Layout and Design Tips
- Weight distribution: Place heavy items (tank, washer) low and over axles for stability.
- Accessibility: Keep gun, nozzles, and chemicals easy to reach.
- Hose management: Mount reels high enough to roll smoothly; avoid sharp edges.
- Ventilation: Gas engines need airflow; never enclose running engine.
- Secure everything: Strap tanks, lock reels, and secure chemicals.
- Electrical: Proper grounding, GFCI if using electric accessories.
- Spill containment: Consider a containment pan for chemicals/oil.
Water Supply Considerations
Since rigs often use tanks, plan for suction properly:
- Gravity feed: Elevate tank 2–4 feet above pump inlet minimum.
- Transfer pump: Use 12V, gas, or electric transfer pump sized for washer GPM.
- Suction hose: Short, large diameter (3/4–1″), with airtight fittings.
- Strainer: Cleanable inlet strainer between tank and pump.
- Vented tank: Prevents vacuum lock.
Legal and Environmental Considerations (USA)
- Business licensing: Check city/county/state requirements for power washing business.
- Water discharge: Many municipalities restrict discharging wash water to storm drains. Use containment, filtration, or direct to sanitary sewer when required.
- Chemical use: Follow EPA/local rules for detergents and degreasers.
- Hauling: Ensure trailer is properly registered, tagged, and equipped with lights/brakes as required.
- Insurance: General liability insurance is highly recommended for commercial work.
- DOT considerations: Large rigs may have commercial vehicle requirements depending on GVWR.
Safety for Mobile Rigs
- Secure load: Prevent tank/washer shift during transit.
- Level operation: Set rig on level ground when running.
- Refuel safely: Turn off engine, cool before refueling.
- Ventilation: Never run gas engines in enclosed spaces.
- Spill response: Carry absorbent pads and follow cleanup procedures.
- PPE: Eye, hearing, foot protection for operator and crew.
- Fire safety: Keep fire extinguisher accessible.
Maintenance for Rigs
- Trailer maintenance: Tires, bearings, lights, brakes, hitch.
- Tank care: Clean, inspect for leaks, UV protection.
- Hoses/reels: Check for wear, leaks, proper retraction.
- Engine/pump: Follow service intervals; winterize fully.
- Plumbing: Check clamps, fittings, valves for leaks.
- Rust prevention: Touch up steel, keep dry.
Cost and Profitability
| Expense | Range (USD) | Notes |
|---|---|---|
| Used trailer | $800–$3,000 | Varies by size/condition |
| Pressure washer (pro) | $1,000–$4,000 | Belt-drive triplex preferred |
| Water tank | $300–$1,500 | Poly vs IBC vs custom |
| Hose reel, hoses, guns | $300–$1,000 | Quality saves downtime |
| Surface cleaner | $250–$1,000 | Speeds jobs, pays for itself |
| Transfer pump/plumbing | $150–$600 | Needed if not gravity-fed |
| Total startup | $3,000–$10,000 | Typical range for solid rig |
Job rates vary by location and service. Concrete cleaning, fleet, and commercial contracts typically offer better margins than one-off small jobs.
Frequently Asked Questions
Do I need a special license to run a power washing rig?
Business license usually required. Check local rules. If hauling heavy loads, DOT/GVWR rules may apply.
How big should my water tank be?
Match to GPM and typical job length. For 3–4 GPM commercial work, 200–300 gal is common.
Can I use pond water in my rig?
Not recommended without extensive filtration. Sand/silt will destroy pumps quickly.
Do I need to contain wash water?
Often yes, especially when using chemicals or washing near storm drains. Check local stormwater regulations.
What’s the best rig for a beginner?
A used trailer with 100–150 gal tank and a reliable gas pro washer is a cost-effective starting point.