Pool Overflowing After Rain in The Colony, TX — What to Do

The storm dumped three inches of rain overnight, and now your pool is full to the coping — water lapping at the deck edge, the skimmer completely submerged, and a sheet of water flowing across the equipment pad toward the house. For homes in Austin Waters, Stewart Peninsula, and The Tribute, where the proximity to Lewisville Lake means heavier, longer rain events than inland cities typically receive, an overflowing pool after a major storm is a semi-regular occurrence rather than a freak event.

An overflowing pool isn't an emergency in the structural sense — the pool shell handles the excess water without damage. But the overflow creates secondary problems that need prompt attention: flooded equipment pads, disrupted water chemistry, compromised skimmer operation, and potential drainage issues around the house foundation.

Immediate Actions: The First 30 Minutes

Lower the Water Level

The fastest method depends on your equipment:

If you have a multiport valve (sand or DE filter): Turn the pump on and set the valve to WASTE. This bypasses the filter and sends water directly out the waste/backwash line. Run it until the water level drops to mid-skimmer — the optimal operating level. For a pool that's 3 inches over-full, this takes roughly 20-40 minutes depending on pump flow rate.

If you have a cartridge filter (no waste setting): You'll need to use a submersible pump (a small sump pump, available at hardware stores for $50-80) to pump excess water out of the pool. Drop it in the shallow end and run the discharge hose to a drainage area (not toward the house foundation). Alternatively, some cartridge filter systems have a drain port that can be opened to release water.

Where to discharge the water: Onto your yard, into a storm drain, or onto a permeable surface that slopes away from the house. Don't pump pool water directly onto a neighbor's property, onto the street in a way that creates a flow hazard, or into the sanitary sewer system (this is a municipal code violation in most jurisdictions including The Colony).

Chlorinated water and landscaping: Pool water discharged onto your lawn will temporarily stress the grass in the immediate area due to chlorine content. The chlorine dissipates quickly in soil and sunlight. If you're discharging near sensitive plants or a garden bed, direct the hose to a less sensitive area or let the chlorine level drop naturally for 24-48 hours before draining (if the overflow isn't causing immediate problems).

Check the Equipment Pad

If overflow water reached the equipment pad:

• Check for standing water around the pump motor. If the motor base is submerged, turn the pump breaker OFF immediately. A submerged motor can short and be destroyed if powered on. Wait for the water to recede, dry the motor, and inspect before re-energizing.
• Check the sub-panel and electrical connections. If water is dripping from the panel cover or standing around the panel base, kill power at the main breaker until the area dries and an electrician can inspect.
• If the equipment pad is dry or nearly dry, normal operation can continue while you lower the water level.

Restore Skimmer Function

When the water level is above the top of the skimmer opening, the skimmer can't function properly. The weir can't swing because it's fully submerged, and the skimmer pulls water from below the surface rather than skimming the top layer. Surface debris — which accumulated heavily during the storm — floats uncollected.

Lowering the water to mid-skimmer restores normal skimmer operation. After lowering, skim the surface manually to remove the accumulated debris that the skimmer missed while it was submerged.

Chemistry After an Overflow

A major rain event doesn't just raise the water level — it changes the chemistry. See our detailed guide on balancing pool water after heavy rain for the full rebalancing protocol. The key points specific to an overflow situation:

The water that entered is diluting your chemistry. Three inches of rain on a typical Colony pool adds roughly 2,000-3,000 gallons of untreated, acidic (pH ~5.0-5.5), zero-chlorine, zero-alkalinity water. This dilutes every chemical parameter — chlorine, pH, alkalinity, CYA — simultaneously.

Test everything after lowering the water level. Don't guess. The dilution effect from a 3-inch rain is significant enough to push chlorine below effective levels and pH below comfortable ranges. Follow the rebalancing sequence: alkalinity first, pH second, shock third.

The water you pumped out was your treated pool water. When you run the pump on waste to lower the level, you're removing water that contained your chemicals. The remaining water is a mix of your original pool water and diluted rainwater. You'll need to add chemicals to restore the balance — treat it as a partial refill.

Why Colony Pools Overflow More Than Inland Pools

Rainfall Intensity

The Colony's position near Lewisville Lake means weather systems moving through the DFW corridor often deliver heavier precipitation in The Colony than in inland cities. Moisture off the lake feeds storm systems as they pass, increasing rainfall totals. A storm that drops 1.5 inches in McKinney may drop 2.5 inches in The Colony.

This translates directly to pool water level. A 2.5-inch rainfall on a 15×30 pool adds approximately 700 gallons of water. A 4-inch rainfall adds roughly 1,100 gallons — enough to raise the pool level by 3-4 inches.

Surrounding Drainage

In established Colony neighborhoods, the drainage infrastructure handles most storm water effectively. But during intense storms — especially when the ground is already saturated from previous rain — surface runoff from yards, patios, and decks flows toward low points. If your pool sits at or near a low point in your lot's grading, it collects runoff from surrounding surfaces in addition to direct rainfall. This amplifies the water level rise beyond what the rainfall alone would cause.

Higher Water Table

The Colony's proximity to Lewisville Lake means the local water table sits higher than in inland areas. During extended wet periods, the water table can rise enough to create hydrostatic pressure beneath the pool shell. This doesn't cause overflow directly, but it means the soil around the pool is already saturated — surface runoff has nowhere to drain, and it accumulates around and in the pool.

Preventing Future Overflows

Install a Pool Overflow Drain

An overflow drain is a gravity-fed drain installed at the top edge of the pool (at the coping level or just below the deck surface) that automatically channels excess water away from the pool before it reaches overflow height.

Some pools have overflow drains installed during construction — check your pool's as-built drawings or look for a grate or opening near the top of the pool wall at coping height. If your pool doesn't have one, a pool contractor can retrofit one for approximately $500-1,500 depending on access and where the drain line can discharge.

Improve Deck Drainage

If storm water flows across the deck toward the pool, the deck grading is contributing to the overflow problem. A landscape contractor can:

• Add deck drains (linear channel drains or point drains) that intercept surface water before it reaches the pool. Cost: $300-800 per drain.
• Regrade the deck perimeter to direct surface flow away from the pool. Cost: $500-2,000 depending on scope.

These are one-time improvements that permanently reduce the volume of surface runoff entering the pool during storms.

Lower the Normal Water Level Slightly Before Storm Season

If you know spring storm season is approaching (March-May in North Texas), maintaining the pool water level at one inch below mid-skimmer rather than exactly at mid-skimmer gives you an extra inch of capacity before overflow occurs. One inch of capacity in a 15×30 pool is roughly 280 gallons — enough to absorb a moderate rain event without overflowing.

This doesn't affect skimmer performance significantly — the skimmer operates effectively with the water level anywhere from 1/3 to 2/3 up the skimmer opening. Running slightly below center is within the normal operating range.

Monitor Weather Forecasts

When heavy rain is forecast (2+ inches), consider proactively lowering the water level by 2-3 inches before the storm arrives. This pre-emptive drop creates buffer capacity. After the storm, the rain refills the pool to near-normal levels without overflowing.

This is a manual process — run the pump on waste for 20-30 minutes to drop the level before the storm. It takes a few minutes of effort and prevents the post-storm scramble of emergency draining, equipment checks, and chemistry recovery.

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Tired of post-storm pool problems? Hydra Pool Services monitors conditions and adjusts service around weather events — keeping Colony pools balanced through storm season across Austin Waters, Stewart Peninsula, The Tribute, and every community we serve. Get storm-season coverage →