InstaBidsWhat is pressure washing?
Pressure washing cleans surfaces with a mechanical sprayer that delivers water under high pressure. The force can remove surface material as well as dirt, so the material being cleaned matters.
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Can pressure washing remove oil stains?
It may help remove oil, but a stain is not certain to disappear. The National Park Service describes pressure washing as a possible treatment for crude oil on historic structures and warns that it can also push contamination farther into the surface. That context does not establish a result for every driveway stain. “One major disadvantage of using power washing to remove oil contamination is that it may drive the chemicals farther into the surface of the material.” Source: National Park Service, read 2026-10-31.
What does the National Park Service mean by pressure washing?
Pressure washing means cleaning a surface with a mechanical sprayer that delivers water under high pressure. The National Park Service uses this definition in its headstone guidance, where it also explains why the force of the spray matters to fragile stone. “Pressure washing systems are mechanical sprayers that use water under high pressures to clean surfaces.” Source: National Park Service, read 2026-10-31.
Can pressure washing damage concrete?
Yes, excessive pressure can remove material and scar historic concrete, according to the National Park Service. Its warning groups concrete with historic stone and brick. The captured guidance does not give one pressure setting that is suitable for every concrete driveway or surface. “Care must be taken with the use of pressure washers on historic stone, brick, or concrete.” Source: National Park Service, read 2026-10-31. “Excessive pressures used on historic materials can result in the removal of surface material and scarring of the surface of historic structures.” Source: National Park Service, read 2026-10-31.
Does pressure washing use a lot of water?
Water use depends on flow and spraying time. In one specific crude-oil treatment for historic structures, the National Park Service describes 4–6 gallons per minute. At that flow, ten minutes of continuous spraying would use 40–60 gallons, calculated from the cited rate. This is an example, not a typical household-job total. “Depending on the condition of the structure’s surface, washing with low to medium jet pressure (200-500 pounds per square inch (psi) at 4-6 gallons per minute (gpm) using a 45 degree fan type nozzle) may help remove the crude oil.” Source: National Park Service, read 2026-10-31. “Power washing includes a variety of variables that influence the performance, including pressure, volume, temperature, nozzle pattern, attitude or angle of delivery, water quality, operator skill, and chemical additives.” Source: National Park Service, read 2026-10-31.
Can pressure washing wastewater be allowed to enter a storm drain?
Sacramento County says pressure-washing wastewater should never enter a storm drain. Its guidance discusses collecting that water and conditional disposal to a sanitary sewer or landscaped area. These are Sacramento County directions; the appropriate disposal route for a project depends on the local rules and what the wastewater contains. “Pressure washing is an excellent way of removing pollutants from outdoor surfaces but pressure washing wastewater should never be discharged to a storm drain!” Source: Sacramento County Environmental Management, read 2026-10-31. “With the property owner's permission, the collected wastewater can be pumped into a sanitary sewer clean-out, mop sink or toilet, or, in some instances, discharged to a landscaped area, provided that the discharge does not overflow the landscaped area, contain hazardous constituents, or create nuisance conditions.” Source: Sacramento County Environmental Management, read 2026-10-31.
Sources
- Best Practice Recommendations for Cleaning Government Issued Headstones — National Park Service; read 2026-10-31.
- Protecting Historic Structures from Oil Contamination — National Park Service; read 2026-10-31.
- Stormwater Program: Best Management Practices — Sacramento County Environmental Management; read 2026-10-31.