** house has a well for a water source. The dishwasher does not receive enough force from the water to adequately wash the dishes. **
As Dodgeman said, as long as the dishwasher is filling to the proper lever (usually just below the heater element), the house water pressure is NOT the cause of the dishwasher not washing properly.
If it is NOT filling to the proper level, a different water fill valve may be available to deal with he low water pressure depending on the brand and *exact* model number of the unit (assuming there just isn’t a problem in the water connections to it causing the slow fill). Most dishwasher water valves will function adequately with between 20 – 120 PSI water pressure.
If the problem is NOT the water pressure to it, we’ll need the make and model number to suggest possible causes inside the dishwasher itself. You can find tips for locating the model and serial number identification tag on your appliances in the ‘Repair Parts’ section of my web site linked below.
The Appliance Information Site