Hull Cleaning
Removal of marine growth, algae, and buildup to improve vessel performance and fuel efficiency.
Professional Underwater Hull Cleaning Throughout Northern California
Serving boat owners from Sacramento to the San Francisco Bay Area with professional hull cleaning, zinc replacement, underwater inspections, and running gear cleaning.
Owner Operated
Dive Certified Since 1992
26 Years Experience
100s of Boats Every Year
26+
Years in Business
1992
Dive Certified
100s
Of Boats Serviced Annually
Licensed
& Insured
Complete Underwater Boat Maintenance
Tim personally performs every service, ensuring consistent quality and attention to detail.
Shaft & Propeller Cleaning
Keep running gear clean and operating efficiently.
Outdrive Cleaning
Thorough cleaning and inspection of outdrives and underwater components.
Through-Hull Cleaning
Maintain proper water flow and system performance.
Zinc Inspection & Replacement
Inspection and replacement of sacrificial zincs to help protect your vessel from corrosion.
Underwater Inspections
Visual inspections of hulls, running gear, and underwater components.
Serving All Types of Recreational Boats
Sailboats
Powerboats
Fishing Boats
Yachts
Catamarans
Pontoon BoatsExperience Matters Below The Waterline
For over 26 years, Tim DeRooi has helped Northern California boat owners keep their vessels clean, protected, and performing at their best.
Unlike larger companies that send different technicians, every service is personally performed by Tim.
State of California Licensed and Insured. License #012276.
- Consistent service every visit
- Direct communication with the owner
- Extensive local marina experience
- Professional scuba certification
- Reliable scheduling
- Honest recommendations
Proudly Serving Marinas From Sacramento To The Bay
Tim services marinas across the Delta, Sacramento region, and the San Francisco Bay Area.
- Sacramento
- Rio Vista
- Suisun City
- Lake Berryessa
- Benicia
- Glen Cove
- Vallejo
- Richmond
- Berkeley
- Emeryville
- Alameda
- Sausalito
- Bodega Bay
Need service elsewhere? Call to discuss your location.
Fair Pricing Based On Boat Size
Services typically range from: $4.50 - $10.00 Per FootPricing varies based on boat type, hull condition, location, and service requested.
Request PricingFrequently Asked Questions
How often should I have my hull cleaned?
Most vessels benefit from regular cleaning every 4-8 weeks depending on usage and location.
Do you replace zincs?
Yes. Zinc inspection and replacement services are available.
Do I need to be present?
Not always. Tim can discuss service arrangements directly with you.
Do you work at my marina?
Most likely. Below The Surface serves marinas throughout Northern California and the Bay Area.
Request A Quote
Need hull cleaning or an underwater inspection? Call or email Tim directly.