You Can’t Do Real Pool Leak Detection From the Pool Deck

If you own a swimming pool in Massachusetts, New Hampshire, or Maine and your pool is losing water, there’s a good chance someone has already told you the problem is “probably underground plumbing.”

The reality is that most swimming pool leaks are not found by standing on the pool deck or simply pressure testing pipes. Real pool leak detection requires a full underwater inspection inside the pool itself.

At Seacoast Water Services, we get in the water on every inspection no matter the water temperature. That’s because many leaks can only be identified underwater through direct inspection, dye testing, listening equipment, and hands-on evaluation.

Why Pool Deck Leak Detection Often Misses Leaks

One of the biggest misconceptions in the pool industry is that every leak is a broken underground pipe.

After performing hundreds of leak inspections across New England, our inspection data consistently shows that underground plumbing leaks are only a portion of the leaks we find. Many leaks are actually located inside the pool structure itself.

Common leak locations include:

• Lights and light conduits

• Skimmer throat cracks

• Return fittings

• Skimmer Sumps

• Main drains

• Vinyl liner tears

• Tile line cracks

• Bond beam cracks

• Separation around fittings

• Hydrostatic Valves

• Underwater structural cracks

Most of these issues cannot be properly evaluated from the pool deck.

Why Getting in the Pool Matters

Underwater inspections provide a completely different perspective than visual checks from outside the pool.

Once underwater, leak specialists can:

• Inspect fittings, lights, and all other apparatus at eye level, up close

• Use dye testing precisely at suspected leak points

• Identify failed previous repairs

• Determine whether a repair can be completed immediately

In many cases, getting underwater reveals multiple issues that would never be visible from above.

Pressure Testing Alone Is Not Leak Detection

Pressure testing can be a useful tool in certain situations, but pressure testing alone is not comprehensive leak detection.

A pressure test may confirm that a pipe has a problem, but it often does not tell you:

• Where the leak is located

• Whether the leak is actually underground

• Whether multiple leaks exist

• Whether the plumbing is even the main source of water loss

This is why many pool owners end up paying for unnecessary excavation or entire pipe replacements before a proper leak inspection is performed.

Cold Water Is Not an Excuse

In New England, many pools open in very cold conditions during the spring. Some companies avoid getting in the water altogether during these periods.

The problem is simple: leaks do not stop because the water is cold.

If the inspection is incomplete, leaks can easily be missed. That often leads to repeat visits, wasted money, ongoing water loss, and unnecessary frustration for homeowners.

Professional pool leak detection sometimes means getting in 45-degree water because that’s what the job requires.

Signs You May Have a Swimming Pool Leak

Common signs include:

• Losing more than 1/4 inch of water per day

• Air entering the system

• Cracks near skimmers or tile lines

• Wet spots in the yard

• Water loss that increases when the system runs

• Constant need to add water, more than 1 time per week

If you are experiencing any of these issues, a full underwater leak inspection is usually the best starting point.

Pool Leak Detection in Massachusetts, New Hampshire, and Maine

Seacoast Water Services specializes in professional swimming pool leak detection and underwater repairs throughout New England.

Our inspections combine:

• Underwater leak inspection

• Dye testing

• Electronic liner scanning

• Acoustic leak detection

• Underground leak locating

• Camera inspections

• Same-day underwater repairs when possible

Because at the end of the day, you can’t do real leak detection from the pool deck.

Underwater Repair