How To Get Rid Of A Swimming Pool: The Step-by-Step Engineering And Demolition Guide

To successfully get rid of a swimming pool, you must choose between a structural partial collapse (fill-in) or a complete excavation removal, secure municipal permits, safely discharge thousands of gallons of water, and backfill the cavity with engineered, compacted soil layers. Adhering to strict ASTM soil compaction standards is required to prevent future ground sinkage, water pooling, and severe property devaluation.

Removing an unwanted swimming pool is a major civil engineering project that permanently alters your property's topography, drainage patterns, and real estate value. Whether you are dealing with a failing concrete, vinyl, or fiberglass structure, simply dumping dirt into the deep end is a recipe for structural failure.

To execute this project safely and legally, you must understand the physics of soil compaction, hydrostatic pressure, and structural demolition. This guide outlines the precise steps, equipment, and specifications required to permanently decommission and remove an in-ground pool.

Permitting, Engineering, and Site Preparation Checklist

Before any heavy machinery rolls onto your lawn, you must lay the administrative and technical groundwork. Swimming pool demolitions require heavy equipment, precise utility location, and strict compliance with local environmental and building codes. Failing to obtain the correct permits can result in hefty municipal fines and can even prevent you from selling your property in the future.

Essential Gear, Materials, and Project Benchmarks

• Heavy Machinery & Attachments: 15-ton to 20-ton hydraulic excavator, skid-steer loader, pneumatic jackhammer (breaker attachment), and a heavy-duty vibratory plate compactor or trench roller.
• Materials & Backfill Mediums: Clean structural fill dirt (sandy clay or loam free of organic debris), #57 washed crushed stone (for drainage layers), non-woven geotextile filter fabric, and 6 to 12 inches of organic topsoil.
• Mandatory Standards & Compliance: ASTM D1557 (Modified Proctor Compaction Test) compliance, regional EPA guidelines for chlorinated water discharge, and a mandatory "Call 811" utility ticket to map underground gas, water, and electrical lines.
• Estimated Budget & Duration: $5,000 to $15,000 for partial demolition; $9,000 to $25,000+ for complete removal. The typical timeline spans 3 to 7 active working days depending on weather and site accessibility.

Step-by-Step Pool Demolition and Soil Backfilling Execution

Executing a pool removal requires strict adherence to structural guidelines to avoid creating a subterranean swamp or a collapsing sinkhole in your backyard. Below is the precise operational sequence for both partial and full pool removals.

Step 1: Utility Disconnection and Permitting Securement

Before touching the pool, you must isolate and safely decommission all connected utilities. Locate the pool's dedicated subpanel and shut off the electrical breakers. Disconnect and cap all gas lines supplying pool heaters, ensuring a certified technician performs the physical disconnect at the main line to prevent dangerous leaks.

File your demolition plans with your local building department. Your permit application must specify whether you are performing a partial demolition or a complete structural removal. If you opt for a partial fill, some municipalities require a structural engineer's signed wet stamp on the drainage and backfill plans.

Step 2: Dewatering and Hydrostatic Relief

Pumping out the pool water must be done with caution. Chlorine and bromine are highly toxic to local ecosystems; you must neutralize the water using sodium thiosulfate or let the water sit uncovered for at least one week until chlorine levels drop to 0 parts per million (ppm) before discharging it.

Pump the water slowly using a submersible utility pump, routing the discharge hose to the street storm drain or a designated municipal sewer cleanout according to your local codes.

Warning: Do not drain a pool rapidly if your property has a high water table. Without the weight of the water, hydrostatic pressure can cause the entire concrete shell to float or "pop" out of the ground, rupturing nearby sewer and gas lines. If you suspect a high water table, drill a relief hole in the pool floor or pump only during dry weather windows.

Step 3: Structural Demolition and Drainage Penetration

The physical demolition steps vary significantly based on whether you are executing a partial or complete pool removal:

• For Partial Demolition (Cave-In Method): Use a hydraulic breaker to punch at least two massive holes (minimum 3 feet in diameter) through the deepest portion of the pool floor. These holes are vital; they prevent the concrete shell from acting as a subterranean bathtub that collects rainwater and liquefies your backfill. Next, break down the pool's concrete coping and vertical walls to at least 36 inches below the final grade. Throw the clean, broken concrete debris into the bottom of the pool shell to serve as a porous base layer.
• For Complete Demolition (Full Removal): Use the excavator to systematically break apart and remove the entirety of the concrete shell, steel rebar, vinyl liner, or fiberglass structure. Haul all non-biodegradable debris to a licensed recycling or waste management facility. This leaves a clean, open dirt cavity ready for engineered backfilling.

Warning: Never leave any vinyl or fiberglass materials in a buried pool cavity. Unlike concrete, these synthetic materials do not allow water filtration and will trap moisture, causing severe ground shifting and surface mud pits.

Step 4: Base Layer Stabilization and Geotextile Placement

For partial demolitions, cover the broken concrete at the bottom of the pool with a layer of #57 washed crushed stone. This stone layer must be at least 12 inches thick to facilitate water drainage toward the punched relief holes.

Lay a sheet of non-woven geotextile filter fabric over the crushed stone. This fabric acts as a barrier, allowing groundwater to filter down while preventing fine soil particles from washing into the voids between the concrete chunks, which would otherwise cause the ground above to sink.

Step 5: Lift-by-Lift Soil Backfilling and Compaction

The longevity of your reclaimed yard depends entirely on how well you compact the soil. Do not dump all the dirt into the hole at once.

1. Deposit clean structural fill dirt into the cavity in uniform layers, known as "lifts," that are no deeper than 6 to 8 inches.
2. Run a heavy vibratory plate compactor or a trench roller over the entire surface of each lift. Make at least three to four passes per layer.
3. Lightly mist the soil with water during compaction. The soil must reach its optimum moisture content to slide together and eliminate air pockets.
4. Repeat this process lift-by-lift until the cavity is filled to within 6 to 12 inches of the final surface level.

Pro-Tip: Target a soil compaction rating of 90% to 95% of the Maximum Dry Density as determined by the ASTM D1557 Modified Proctor Test. Anything less will guarantee ground settling and structural sinkage over the subsequent 12 to 24 months.

Step 6: Grading, Topsoil Application, and Turf Establishment

Once the structural fill is fully compacted, add 6 to 12 inches of high-quality, screened topsoil. Grade the area so that it slopes away from your home's foundation at a minimum 2% decline (roughly a 1/4-inch drop per foot) to ensure proper rainwater runoff.

Compact the topsoil lightly using a water-filled lawn roller to stabilize the surface without over-compacting it, which would prevent plant roots from breathing. Plant grass seed or lay sod immediately to anchor the soil and prevent wind and rain erosion.

Technical Comparison of Pool Removal Methods

Choosing between a partial cave-in and a complete excavation has long-term financial, legal, and structural implications. Use the table below to compare the two methods.

Structural Failures and Field Remedies

Pool demolitions can sometimes run into structural issues if the contractor cuts corners. Below are the most common field failures and how to fix them.

Ground Sinkage and Yard Depression (The "Sponge" Effect)

• Root Cause: The backfill soil was either dumped in too thick of a layer (over 12 inches per lift) without compaction, or organic soil containing wood, grass, and roots was used. As the organic matter decays and the loose soil settles, a large sinkhole forms in the yard.
• Actionable Fix: Excavate the sunken, uncompacted soil down to the stable base layer. Replace the excavated soil with clean structural fill, compacting it in strict 6-inch lifts using a heavy vibratory plate compactor. Test the compaction levels with a hand-held penetrometer to ensure it meets a minimum 90% Proctor density.

Poor Yard Drainage and Surface Pooling

• Root Cause: The drainage holes punched into the concrete floor of the pool shell were either too small or omitted entirely. Rainwater filters through the dirt, strikes the intact concrete bowl, and backs up, turning your yard into a muddy swamp.
• Actionable Fix: Install an engineered French drain system directly over the old pool footprint. Excavate a trench leading away from the pooling zone to a lower point on your property or a street storm drain. Line the trench with geotextile fabric, lay a perforated PVC pipe, and backfill the trench with washed river stone.

Structural Shifting of Adjacent Patios and Hardscapes

• Root Cause: Failure to support the surrounding earth during excavation, or improper compaction of the perimeter zones directly adjacent to the old pool walls, leading to lateral soil migration.
• Actionable Fix: Install helical piers under the settling concrete slab or patio to stabilize the structure. If the concrete is cracked beyond repair, demolish the affected section, excavate and compact the underlying subgrade to 95% ASTM D1557 density, and pour new concrete reinforced with rebar.

Frequently Asked Questions

Does getting rid of a swimming pool decrease my home's resale value?

In many cases, removing an old, poorly maintained pool actually increases your home's pool of potential buyers and overall marketability. However, a partial pool demolition must be legally disclosed to future buyers and can limit where they can build home additions or outbuildings. A complete, professionally documented pool removal minimizes any negative impact on your property value.

Can you build a house, patio, or accessory structure over a filled-in pool?

You cannot build any load-bearing structures over a partially demolished pool because the buried concrete chunks and shell remnants cannot support structural foundations. If you complete a full pool removal, backfill it to 95% ASTM D1557 compaction, and obtain a certified compaction report from a geotechnical engineer, you can safely build over the area.

What is the best dirt or fill material to use for a pool cave-in?

The ideal backfill material is clean, inorganic structural fill dirt consisting of a mixture of sand, silt, and clay. Avoid using pure clay, as it expands and contracts with moisture changes, and never use topsoil or organic compost for backfill because it will rot and cause severe ground settling.

How do you prevent a drained pool from "popping" out of the ground during demolition?

To prevent a pool from lifting due to high groundwater pressure, always drill several 2-inch hydrostatic relief holes in the deepest part of the pool floor immediately after draining the water. Only drain and demolish your pool during dry weather windows when the local water table is at its lowest level.

Do I need a structural engineer to get rid of my pool?

Most municipalities require a structural or geotechnical engineer to sign off on a partial pool demolition plan to verify that the drainage design is sound and that the backfill compaction meets local safety codes. For a complete removal, an engineer's stamp may not be required, but it is highly recommended to protect your property's future equity.

Transition Your Outdoor Space with Professional Engineering

Ready to reclaim your backyard, eliminate ongoing liability, and cut your monthly maintenance costs once and for all? Contact a licensed civil engineer and demolition specialist to schedule a site evaluation and get a customized, permit-ready pool removal plan today.