Water Inspection Port

How to Manage Your Fiberglass Pool’s Water Inspection Port

Maintaining the structural integrity of your fiberglass pool involves more than balancing chemicals and skimming leaves. One commonly overlooked component is the water inspection port (also known as a groundwater pipe or hydrostatic relief point).

This guide explains what the inspection port does, how often it should be checked, and the proper steps for draining it safely when necessary.

A water inspection port is a vertical pipe installed next to the pool shell, usually near the deep end. It is typically covered with a skimmer-style lid so it blends in with the surrounding deck.

Its primary purpose is to allow you to monitor and remove groundwater that may collect beneath the pool shell.

By managing this groundwater, you reduce hydrostatic pressure—the force created by standing water in the soil that can push upward against the pool. Controlling this pressure helps prevent shell movement, cracking, or structural damage.

Regular inspections are the best way to prevent groundwater-related issues.

• Monthly: Inspect the port at least once per month.
• After Heavy Rain: Check it immediately following significant rainfall or extended wet conditions.
• Dry Port: No action is required.

 Standing Water: Indicates groundwater buildup and should be drained to relieve pressure.

Before starting, gather a few basic tools. Heavy equipment is not necessary.

• Submersible Pump: A small utility pump is ideal.
• Siphon Hose: A manual alternative if a pump is unavailable.
• Drainage Location: A suitable area that complies with local drainage regulations.

 If water is present in the inspection pipe, follow these steps carefully:

• Locate and Open: Find the inspection port near the deep end and remove the lid.
• Insert the Pump: Lower the pump or siphon hose until it reaches the water.
• Drain Slowly: Begin pumping gradually to avoid disturbing soil or gravel beneath the pool.
• Monitor the Process: Watch the water flow to ensure sediment is not being pulled up.
• Finish Up: Once the port is dry, turn off the pump, remove the equipment, and replace the lid securely.

Never attempt to solve groundwater issues by draining your swimming pool. The water inside the pool provides essential counterweight against outside pressure.

• Water Level: Never lower the pool water below the mid-skimmer level.
• Professional Help: If the port refills quickly or the water is muddy, contact a fiberglass pool professional.

Need help identifying your inspection port, or have questions about groundwater? Contact your pool professional for assistance.