Building an outdoor water fountain requires four main steps: choose a level site with power access, install a waterproof basin, add a submersible pump with tubing, then arrange stones and decorative elements over the structure.
A backyard water feature adds movement and sound to any outdoor space, and the DIY route keeps the cost far below pre-built kits. The project breaks into four straightforward stages — site prep, basin installation, pump and plumbing setup, and finishing with stonework — each with a few critical details that separate a stable fountain from a leaky one.
Choose the Location and Plan the Layout
Start by picking a level spot within reach of an electrical outlet or a route for an unobtrusive extension cord. Measure the footprint of your planned fountain and mark it on the ground with spray paint or stakes before buying materials — skipping this step is the most common reason a finished fountain doesn’t fit the space. Map out where the pump cord will run: a short trench to the nearest outlet with PVC conduit keeps the wiring tidy and protected, per This Old House’s fountain-building guide. If you’re still deciding on a design, our roundup of tested indoor and outdoor fountains can help you compare options before you start digging.
Dig the Basin and Set the Water Reservoir
Dig a pit roughly 2 inches deeper than your waterproof basin or container, then lay a 2-inch bed of drainage gravel in the bottom. This gravel layer prevents the basin from settling unevenly over time. Set the basin level in the hole — an unlevel basin causes the water to pool on one side and can make the pump run dry. Backfill around the basin with more gravel or soil, packing it firmly so the container doesn’t shift. For a simpler approach, wikiHow Life’s guide notes that you can bury a large plastic pail or tub as the reservoir, as long as it holds enough water to keep the pump fully submerged during operation.
Install the Pump, Tubing, and Flow Control
Place the submersible pump at the lowest point inside the basin. Attach flexible tubing or PVC pipe from the pump outlet up to the fountain’s top feature — a spout, stacked stone, or tiered bowl. Include a ball valve in the line so you can adjust flow after testing. Run the pump cord through a small hole drilled near the top of the basin, then seal that hole with clear silicone caulk to prevent leaks. Lowe’s two-tier fountain tutorial specifically recommends applying silicone caulk around the drain hole and stopper to create a watertight seal. Fill the basin with clean water until the water level sits at least 5 inches above the pump, as This Old House specifies — running the pump dry for even a few seconds can damage it permanently.
Test the Flow and Add Decorative Stone
Plug in the pump and test the water flow before adding any decorative elements. Adjust the ball valve until the stream or cascade looks right — a trickle is usually more relaxing than a strong jet. Turn off the pump, then carefully place stones, river rock, or stacked slate over and around the basin. The decorative layer hides the hardware and creates the natural look, but every piece must be stable enough that shifting or curious pets don’t knock anything into the water. Keep the pump accessible for seasonal cleaning; burying it where you can’t reach it later is a repair headache waiting to happen. When freezing weather arrives, drain the fountain, remove the pump, and store it indoors — ice can crack the basin and burn out the pump if water freezes around it.
FAQs
How deep should the basin be for a DIY fountain?
Depth depends on your pump’s minimum submergence level — most submersible pumps need at least 4 to 6 inches of water above them. A basin that holds 5 to 10 gallons is enough for a small patio fountain; larger designs need proportional reservoirs. Check the pump’s manual for its exact submergence requirement before digging.
Can I build a fountain without burying a basin?
Yes — a freestanding fountain uses a visible basin or container sitting on a level patio surface, with the pump hidden inside. You still need a flat, stable base and access to power, but the container stays above ground. The trade-off is that above-ground basins generally hold less water and may need more frequent refills in hot weather.
What size pump do I need for a small outdoor fountain?
A pump rated between 80 and 200 gallons per hour works for most small to medium patio fountains. Match the pump’s lift height to your fountain’s vertical rise — if water travels 3 feet upward, the pump must have at least a 3-foot maximum lift rating. Pumps with adjustable flow valves give you more control over the final water appearance.
References & Sources
- This Old House. “How to Build a Fountain.” Covers dig depth, gravel bed, water level, and ball valve steps for a garden fountain.
- True Value. “How to Build an Outdoor Fountain/Water Feature.” Describes a buried-reservoir design using pails, liner, and gravel backfill.
- Lowe’s. “How to Build a Two-Tier Patio Water Fountain.” Details silicone caulk use for sealing drain holes and drain stoppers.