Why is my dock turning green, and what should I do about it? Docks on Central Florida lakes turn green because algae and mildew thrive on boards that stay damp from lake spray, shade, humidity and summer rain. Left alone, the film gets slippery and holds dirt, so most lakefront owners have their docks cleaned about once a year, and more often on shaded or heavily used docks. Trident Power Wash gives free estimates across Clermont and about 30 miles around: call (352) 717-8181.
If you live on one of Central Florida's lakes, you already know the pattern. The dock looks great in spring, and by the end of the rainy season the boards have a green or dark film, the steps feel slick and the whole waterfront looks a little tired.
Here is why that happens, what to look for, and what to think about before you clean it.
Why Central Florida docks turn green
A dock gets more moisture than almost any other surface on your property. It sits over the water, gets splashed by boat wakes and wind, and catches every afternoon storm. A few local conditions make it worse:
- Constant humidity. Boards over a lake rarely dry out completely, especially overnight and in the morning.
- Summer rain. Months of afternoon storms keep the surface wet for days at a time.
- Shade. Big oaks, cypress trees and boathouse roofs block the sun that would otherwise dry the boards.
- Organic debris. Leaves, pollen, bird droppings and spider webs settle on the dock and give algae something to grow on.
- Low traffic spots. Corners, the ends of the dock and areas under benches or covers often go green first because they stay damp and undisturbed.
The same moisture that greens up your dock is also at work on your house. Our guide on how often to wash a house in Central Florida explains why lakefront homes often need cleaning sooner than homes farther from the water.
Why it's worth dealing with
Green algae on a dock is more than a cosmetic problem:
- Slips and falls. A wet, green board can be as slick as ice. Steps, ladders and the edge where people climb on and off boats are the riskiest spots.
- Dirt that builds up. The film traps dirt and debris, so the dock gets darker and harder to clean the longer it goes.
- Curb appeal from the water. On lakes like the Clermont Chain and the Butler Chain, your dock is the first thing neighbors and boaters see. A clean dock makes the whole property look cared for.
- Getting ready to sell or host. A clean dock looks better in listing photos and feels better for guests, renters and family gatherings.
What to check before you clean
Walk your dock in daylight and take a few notes. It will help you and anyone who gives you an estimate:
- What it's made of. Wood, composite and other materials each need the right pressure and technique. Be ready to say what your boards are, or snap a photo.
- Loose or damaged boards. Look for soft spots, raised nails or screws, and cracked boards. Point them out before cleaning so nobody is surprised.
- Where the green is worst. Shaded sections, steps, ladders and the area under a boat lift or roof often need the most attention.
- Everything that's on the dock. Furniture, kayaks, coolers, rugs and potted plants need to be moved before cleaning day.
- Nearby surfaces. Seawalls, boathouse walls, railings and the walkway from the house often green up too. It can make sense to clean them on the same visit.
Can I clean it myself?
Some owners try a rental pressure washer, and it can work on a small dock. A few things to think about first:
- Too much pressure can damage boards. Wood can splinter or get gouged when the pressure or nozzle is wrong for the surface, and those marks can hold dirt and moisture later.
- Footing is tricky. You are working on a wet, slippery surface next to deep water, often while handling a hose and wand.
- It takes longer than it looks. Getting even results across every board, step and corner takes time and practice.
If you'd rather not deal with it, dock cleaning is one of Trident Power Wash's core services. Trident uses pressure levels and techniques suited to each surface so the dock comes clean without damaging the boards.
How often lakefront docks need cleaning
For most docks in Central Florida, about once a year is a good baseline. You may want to clean more often if:
- the dock sits in heavy shade or faces north,
- it gets a lot of foot traffic from family, guests or renters,
- you use it to get on and off a boat often, or
- you notice it getting slick within a few months of the last cleaning.
Many owners schedule a cleaning in the fall, after the rainy season has done its damage, so the dock looks good through the drier months. Spring, before boating season picks up, is another popular time. Trident Power Wash offers discounts on recurring cleanings for owners who want to keep their dock clean year-round.
Local things to keep in mind
- Clermont is Trident's home base. Docks and boathouses on the Clermont Chain of Lakes collect algae, bird droppings and green film fast in the summer heat.
- Windermere homes on the Butler Chain of Lakes often have docks and boathouses under mature oaks, where shade keeps boards damp and spider webs and bird droppings build up.
- Tavares sits on the Harris Chain of Lakes, where docks and boat slips on Lake Dora and Lake Eustis grow algae and green film, and humidity off the water drives mildew on nearby siding and soffits.
Get a free dock cleaning estimate
Trident Power Wash is a Clermont-based pressure washing company that cleans docks, homes, driveways and roofs across Lake, West Orange, Osceola and northeast Polk counties. Estimates are free and come with no obligation, and while we're out, we can also look at your house washing needs if the lakeside walls are greening up too. Call (352) 717-8181, Monday to Saturday from 9 AM to 7 PM, or request a free quote online.
Services that help
Frequently asked questions
- Why does my dock turn green so fast in Florida?
- Docks sit right over the water, so the boards stay damp from humidity, lake spray, morning dew and afternoon storms. Shade from trees or a boathouse roof slows drying even more. Algae and mildew grow quickly on surfaces that stay wet, which is why a dock can go from clean to green in a single summer.
- Is green algae on a dock dangerous?
- The main risk is slipping. A thin green film on boards, steps and ladders can be very slick, especially when it's wet. That matters most for kids, older family members, guests and anyone stepping on or off a boat.
- How often should a lakefront dock be cleaned?
- About once a year is a good baseline for most docks in Central Florida. Docks in heavy shade, docks that get a lot of foot traffic and docks used for rentals or entertaining often need it more often. Trident Power Wash offers discounts on recurring cleanings.
- Can pressure washing damage dock boards?
- It can if the pressure or technique is wrong for the surface. Trident Power Wash uses pressure levels and techniques suited to each surface so the dock comes clean without damaging the boards.
- Does Trident Power Wash clean docks on the Clermont, Butler and Harris Chains of Lakes?
- Yes. Dock cleaning is one of Trident's core services. Trident is based in Clermont and serves lakefront homes within about 30 miles, including Clermont, Windermere and Tavares. Call (352) 717-8181 or request a free quote online.
Serving homeowners near you
Trident Power Wash serves Clermont and communities within about 30 miles, including:
Ready for a free estimate? Call (352) 717-8181, Monday to Saturday, 9 AM to 7 PM, or request a quote online. Estimates are free and there is no obligation.