About Simpson
Simpson traces back to 1961, when Jack Simpson, co-owner of an industrial cleaning and painting company, built the first SIMPSON pressure washer to give his own crews a more reliable machine than anything available at the time. That origin as a tool built for people who cleaned for a living is still evident in the brand's lineup of gas and electric pressure washers today, which spans homeowner-grade units up through professional and commercial-duty machines.
Since 2006, Simpson has been part of the FNA Group, a vertically-integrated manufacturer headquartered in Pleasant Prairie, Wisconsin, that produces and assembles most of its own pumps, engines pairings, and accessories rather than outsourcing them. Simpson's gas-powered pressure washers are assembled in the United States, and the brand backs its lineup with a wide accessory ecosystem, including MorFlex, Monster, and Armor hose lines, surface cleaners, and replacement pump parts sold directly through simpsoncleaningparts.com.
Brand website: simpsoncleaning.com
What Simpson makes
Simpson's range runs wider than the products we review. The lines we know best from our own testing are marked with a star:
Gas Pressure Washers
the PowerShot and MegaShot lines, Honda- and Simpson-engine models built for residential and professional cleaning — featured on DIYRated — featured on DIYRated
Electric Pressure Washers
corded homeowner models for lighter-duty cleaning tasks
Surface Cleaners
15-inch and 20-inch rotary attachments for driveways, patios, and parking lots
Pressure Washer Hoses
MorFlex, Monster Hose, Armor Hose, and wrapped rubber hose replacement lines
Replacement Pumps & Parts
OEM triplex pump and engine parts sold through Simpson's dedicated parts store
Why we recognized Simpson
The DIYRated Top Brand recognition isn't paid for and can't be applied for. We award it to the brands whose products consistently stand out in our hands-on category reviews. Simpson earned it on the strength of the products below, evaluated the same way every product on this site is: bought, put to work on real jobs, and judged on merit.
Simpson products we rated highly
Simpson Cleaning PS3228 PowerShot
The Honda GX200 engine pairs with an AAA industrial triplex pump that's field-serviceable with standard tools, unlike the sealed pumps on electric competitors. At 3300 PSI and 2.5 GPM it produces 8250 cleaning units in our testing, more than double any electric model in the same roundup, which is what let it handle deep oil stains and heavily neglected concrete that electric units couldn't touch. Pneumatic tires also kept it rolling across gravel and uneven ground where plastic-wheeled machines got stuck.
Read the 8 Best Pressure Washers for Home Use in 2026 guide →What earned Simpson the recognition
- Simpson's first pressure washer was built in 1961 by a working cleaning-crew owner solving his own reliability problem, and the brand has stayed focused on gas and electric pressure washers ever since.
- Since 2006, Simpson has operated as part of the vertically-integrated FNA Group, manufacturing and assembling most of its own pumps and accessories, with gas-powered units assembled in the United States.
- The PS3228 PowerShot pairs a Honda GX200 engine with an AAA industrial triplex pump rated for continuous-duty use and field-serviceable with standard tools, rather than a sealed unit that gets replaced whole on failure.
- At 3300 PSI and 2.5 GPM, the PS3228 delivers 8250 cleaning units in our testing, giving it enough output for paint stripping and deep concrete cleaning that electric machines in the same roundup can't reach.
- Simpson backs its lineup with a broad accessory ecosystem, including multiple hose lines and surface cleaners, plus a dedicated parts store for long-term repairability.