Stormwater drains generally carry rainwater from streets and properties to local waterways. Pressure-washing runoff can contain soil, paint flakes, oil, detergents, organic matter and other contaminants, so the first question is not only “Will the surface come clean?” but also “Where will the wash water go?”
Before pressure washing
- Identify nearby stormwater grates, garden beds, slopes and low points.
- Sweep and collect loose debris first.
- Check the surface for flaking paint, oil, chemicals or material that may need specialist handling.
- Use the least aggressive suitable method and avoid unnecessary detergent.
- Plan how runoff will be contained or directed lawfully.
- Stop if water begins carrying contamination toward a drain or neighbouring property.
Some surfaces need another approach
Old coatings, fragile mortar, damaged timber, loose paving and unknown materials can be harmed by high pressure. A scope check should consider surface condition, access, drainage and the result expected before the work is accepted.
Green Captains provides pressure washing for suitable outdoor hard surfaces. Photos can help with an initial assessment, but the site conditions determine the final method and price. You can request a tailored quote.
Official source
This checklist is general. Follow current EPA, water-corporation and council requirements for the site and material involved.