How To Build Natural Swimming Pond
In-depth guide to how to build natural swimming pond. Written by a 31-year Texas natural swim pond builder. Real project data, costs, and design guidance.
Published · Updated · By Craig McBride
Overview
Building a natural swimming pond is one of the most rewarding outdoor projects you can undertake. Unlike traditional pools, a swim pond becomes a living ecosystem that gets more beautiful every year. Whether you're hiring a professional or considering a DIY approach, understanding the construction process helps you make informed decisions. Here's the complete step-by-step guide.
Step 1: Planning & Design
Proper planning is the foundation of every successful swim pond. Key decisions include: Location: Choose a spot with 4-6 hours of sunlight (enough for plants but not excessive algae growth), away from large trees (leaf debris), and accessible for excavation equipment Size: Minimum 400 sq ft for swimming. Plan for 50-60% swimming zone and 40-50% regeneration zone Permits: Check local building codes. Most Texas cities require permits for structures deeper than 18 inches Utilities: Locate underground utilities before digging (call 811) Read our Texas permits guide for detailed permitting info.
Step 2: Excavation
Excavation is the most dramatic phase. Transforming your yard into a pond-shaped hole. Key considerations: • Swimming zone: Dig to 6-8 feet deep with gentle graduated entry (beach entry or steps) • Regeneration zone: Shallow area (12-24 inches) for aquatic plants • Shelves: Create 12-inch-wide shelves at 12-inch depth intervals for plant placement • Soil disposal: Budget for hauling away or repurposing excavated soil (50-200+ cubic yards) This phase typically takes 2-3 weeks depending on soil conditions and pond size.
Step 3: Liner Installation
The liner is your pond's most critical component. A single leak can drain thousands of gallons. Best practices: • Underlayment: Lay a minimum 10 oz geotextile fabric above and below the liner to protect it from rocks and roots • Liner material: 60 mil EPDM is the recommended minimum for swim ponds. The company uses 60 mil Carlisle EPDM with a manufacturer's limited lifetime warranty. Avoid 45 mil EPDM and any poly liner under 60 mil for swim ponds • Seaming: All seams must be professionally welded or taped. This is where DIY builds most commonly fail • Edge treatment: Secure edges with an anchor trench or stone edging See our liner options guide for a full comparison of materials.
Step 4: Filtration & Plumbing
The plumbing system drives water circulation between the swimming and regeneration zones: • Pump: Low-wattage, continuous-flow pump sized to circulate the full volume every 8-12 hours • Skimmer: Surface skimmer removes floating debris • Bottom drain: Removes settled sediment from the deepest point • Gravel beds: 12-18 inches of washed pea gravel over 6 inches of larger drainage stone in the regeneration zone Learn more about how natural pond filtration works .
Step 5: Aquatic Plants
Plants are the engine of your natural filtration system. You need three types: • Submerged oxygenators: Hornwort, water celery, anacharis: provide oxygen and absorb nutrients • Emergent plants: Iris, rushes, cattails: grow in shallow water, heavy nutrient uptake • Floating plants: Water lilies, duckweed: shade the surface, reduce algae growth Aim for 60-70% coverage in the regeneration zone. See our plant selection guide for Texas .
Step 6: Filling & Cycling
After filling, the pond needs time to establish its biological ecosystem: • Fill with dechlorinated municipal water or well water • Expect initial cloudiness: this is normal as bacteria colonize the gravel • Do not swim until the water clears and biological cycling is complete
Step 7: Landscaping & Finishing
The final phase transforms your pond from a construction site into a backyard paradise: • Natural stone edging and flagstone pathways • Surrounding garden plantings (native species recommended) • Water features (waterfalls, streams, bubblers) Explore our pond landscaping ideas for inspiration.
DIY vs Professional Build
Even if you plan a DIY build, we offer consulting services to review your design, recommend corrections, and help you avoid costly mistakes. Want a professionally built swim pond? Get a free design consultation and we'll walk you through the process.