DIY Pump Holder for Cistern Tanks: Step-by-Step Build That Lasts 25+ Years

DIY Pump Holder for Cistern Tanks: Step-by-Step Build That Lasts 25+ Years

When it comes to building a reliable water system, one of the most overlooked components is the pump holder inside your cistern tank. A strong, well-built base ensures your pump stays secure, wires remain protected, and the entire setup runs smoothly for decades. After years of trial, error, and improvements, I’ve refined a pump holder design that has already lasted over 20 years in service—and I’m going to walk you through how to build it.

Why a Pump Holder Matters
Your pump sits inside a cistern or reservoir, often submerged or close to standing water. Without a solid foundation, pumps can shift, wires can fray, and fittings can loosen over time. A weighted, bolted, and well-sealed holder prevents these problems while also making future maintenance easier.

Step 1: Building the Frame
For the frame, I use heavy-duty PVC pipe and fill the legs with cement for weight. This prevents the holder from moving once it’s in place. To stop the legs from sliding inside the tank, I drill holes in the base and attach rubber hose feet—these grip much better than the harder rubber pads often found on pressure washers.

Step 2: Cutting Holes for the Pump
I used an inexpensive Harbor Freight hole saw kit. While the 1-inch depth means it takes about four passes to get through, it’s still far cheaper than spending $80 on a deeper bit. If you want a cleaner, faster cut, use a 4½-inch bit instead of the 4-inch kit bit—it saves trimming and makes the fit nearly perfect.

Step 3: Bolting It Together
Angle-drill your bolt holes to make assembly easier, then use rubber spacers (cut from hose) to stabilize the frame. Once everything is bolted together, the frame should sit square and stable inside the cistern.

Step 4: Filling With Concrete
Before filling, wrap the bottom joints with painter’s tape and, if needed, tie lightweight cord around gaps to keep the cement from leaking. Then, fill the legs to the top with bagged concrete. Let the structure cure overnight before moving to the next stage.

Step 5: Cleaning and Finishing
The next day, remove any tape, strings, and excess cement. Use a scraper and wire brush to ensure no debris remains that could break loose inside the cistern. While decorative PVC caps could be added for style points, they cost over $100 for a full set—my own pump holder has been running cap-free for 24 years without issue.

Step 6: Installing the Pump
Once cured, the holder is ready for the pump. Simply slide it into place, connect the wiring (protected with PEX), and secure all fittings. The result is a pump foundation that stays put for decades and keeps your system clean and efficient.

Final Thoughts
This DIY pump holder may not win awards for style, but it’s durable, practical, and proven to last. With a few basic tools, inexpensive materials, and a bag of concrete, you can build a system that won’t need to be touched again for 25+ years.
If you’re setting up a cistern or upgrading your current water system, don’t overlook this small but critical project—it’s the foundation your pump depends on.

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