If you work near the water, boat dock pressure washing is one of the best niche services you can add. Barnacles, algae, and marine slime build up fast -- and dock owners in coastal and lakeside markets are actively looking for someone who knows how to clean them safely. Here's what you need to know about the service, the technique, and what to charge.

The Quick Answer

Marine dock pressure washing runs $150 to $300 for a standard residential dock. Full maintenance packages including sealing run $300 to $600. Here's the basic breakdown:

Standard dock wash: $150 -- $300
Dock + sealing package: $300 -- $600
Boat hull exterior wash: $3 -- $5 per linear foot ($150 -- $350 for a 20-30 ft boat)
Monthly barnacle maintenance plan: Discounted recurring rate (10-20% off single visit)
Boat ramp or marina sections: $0.10 -- $0.20 per sq ft

Coastal markets command higher rates. The same job in Palm Beach or Fort Lauderdale pays more than the national average. Know your market before you set your pricing floor.

What Marine Growth Actually Is (And Why It Matters)

Dock surfaces deal with a unique mix of growth that you'll never see on a driveway. Knowing what you're removing changes how you approach the job.

Algae and slime: Green or brown film that makes surfaces dangerously slippery. Most common in fresh and saltwater lakes.
Barnacles: Hard-shelled crustaceans that attach to pilings and hull surfaces in saltwater. Need higher PSI to break loose.
Mussels: Cluster in groups on pilings below the waterline. Require pre-treatment or diver-assisted removal for heavy infestations.
Waterline scum: Oily film from fuel and salt spray that collects at the waterline. Responds well to hot water and degreaser.

Algae and slime are the most common calls. Barnacle removal is less frequent but commands higher rates because it's labor-intensive and the risk of damaging anti-fouling coatings is real.

PSI and Nozzle Guide by Surface

Dock materials vary, and the wrong pressure setting can splinter wood or strip protective coatings. Match your setup to the surface.

Wood Docks

Stay at 1,200 to 1,500 PSI. Use a 40-degree or 65-degree nozzle. A surface cleaner attachment prevents zebra stripes and speeds up the job significantly. Never hold the wand too close or you'll raise the wood grain and leave permanent damage.

Composite Decking

Composite handles more pressure, but avoid going above 1,800 to 2,000 PSI. Use a 25-degree nozzle and keep the wand moving. Too much pressure on composite can fade or streak the cap layer, which is expensive to replace.

Concrete Boat Ramps and Docks

Full power here. 2,000 to 3,000 PSI with a 15-degree or 25-degree nozzle. Concrete is durable and algae can really dig in. Apply a biodegradable detergent first, let it dwell 5-10 minutes, then blast it off.

Dock Pilings

Pilings get a lot of marine growth right at the waterline. Use 1,500 to 2,500 PSI depending on the material. Wooden pilings need the lower end; concrete and steel can take more. Work from the waterline up in sections.

Safety on Marine Jobs

Dock work has risks that house washing doesn't. These aren't optional -- one slip can send equipment or you into the water.

Non-slip footwear: Marine algae is more slippery than almost any other surface. Rubber-soled boots, not sneakers.
Equipment protection: Keep your hose coiled and out of trip zones. Do not let it hang over the water edge.
Anti-fouling coating awareness: If the boat hull has anti-fouling paint, avoid high PSI. That coating is expensive and protects against marine growth -- stripping it on accident is a liability problem.
Chemical runoff: Many coastal municipalities restrict what chemicals can enter the water. Stick to EPA Safer Choice or marine-safe biodegradable cleaners. No bleach near open water.
Personal flotation: If you're working over the water, a life vest isn't overkill. Courts take a dim view of contractors who skip basic safety.

Chemicals That Are Safe for Marine Environments

Standard house wash chemicals are not appropriate near the water. The wrong product can harm marine wildlife, violate local ordinances, and expose you to liability.

Use plant-based surfactants and enzyme cleaners rated safe for marine environments. Look for products labeled 'biodegradable' and 'non-toxic to aquatic life.' Companies like Meguiar's, Star Brite, and West Marine sell professional-grade marine cleaners that work well with pressure washing.

Avoid sodium hypochlorite (bleach) on or near open water. It's toxic to fish and shellfish at very low concentrations, and some states will fine you for chemical runoff into navigable waterways.

When to Add This Service

Spring is the busiest season for dock cleaning. Boat owners want their docks looking good before the summer season starts. Fall cleaning before winterization is the second peak.

If you're already doing house washing or pool deck cleaning near water, dock work is a natural add-on. You're already in the neighborhood. The pitch is easy: 'I'm already cleaning your pool deck -- want me to do the dock while I'm here?' That conversation consistently closes.

Recurring maintenance plans are the real money maker here. Algae comes back fast in coastal climates -- every 2-3 months is realistic for prevention. A customer on a quarterly plan at $150-$200 per visit is worth $600-$800 a year without any additional marketing spend.

Bottom Line

Boat dock pressure washing is a high-margin niche with less competition than residential house washing. Rates run $150 to $300 per job and recurring quarterly plans can lock in $600 to $800 per customer per year. Know your surface materials, use marine-safe chemicals, and price your minimums to account for the extra setup and safety precautions.

If you want to make quoting dock and marine jobs faster, try QuoteSnap for free. It lets customers get instant estimates right on your website so you're not playing phone tag with every new lead.

Pressure Washing Boat Docks: Marine Growth Removal and Safety (2026)