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Is Your Pool Light Leaking? How to Check the Light Niche

By the Murrieta Leak Pros team ·

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If your pool keeps losing water and the level settles near the light, the light niche may be leaking. It is one of the most common hidden leak spots on a gunite pool. Call (951) 299-3473 any time.

A light niche leak is usually a small seal or conduit problem, but it can lose a lot of water. Our pool leak detection in Murrieta visit confirms the spot with dye and pressure tests before anything is opened.

Where does a pool light leak?

A pool light sits in a metal or plastic cup, called the niche, set into the wall. The light cord runs from the back of the niche through a conduit to a junction box on the deck. Water can escape in 3 places: the gap between the niche and the plaster, the conduit hole at the back of the niche, or a cracked conduit underground.

The light fixture itself does not hold water back. It sits in the niche with water all around it. That is normal. The seal that matters is the one behind it, where the cord leaves the niche.

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Graphic of the signs and checks for a leaking pool light niche in Murrieta
Graphic of the signs and checks for a leaking pool light niche in Murrieta

What are the signs of a pool light leak?

  • The level stops at the light. If the pool drops and stops around the middle or top of the light, the niche is the likely spot.
  • Water in the junction box on the deck, or a damp deck around it.
  • A crack or gap in the plaster around the light ring.
  • The light trips the GFCI or flickers, which can mean water reached the wiring.
  • Losing more than evaporation. Our bucket test shows whether the pool loses more than the sun and wind take.
Where you see the problemWhat it usually means
Dye pulled into the back of the nicheConduit seal failed, needs resealing
Dye pulled into the gap at the plasterNiche and shell pulled apart
Water in the deck junction boxWater traveling up the conduit
Level stops below the lightLeak is lower, check main drain and lines

How do you test the light niche with dye?

Turn off the pump and the pool light breaker first. Wait 10 minutes for the water to settle. Swim down with leak dye or a few drops of food coloring and release it slowly around the light ring and behind the fixture. If the dye gets pulled in and disappears, water is escaping there. Do not remove the light yourself.

  1. Turn off the pool light breaker and the pump.
  2. Wait 10 minutes for the water to go still.
  3. Release dye slowly around the ring and at the edge of the niche.
  4. Watch for dye that is pulled in.
  5. Note the spot and take a photo for the technician.

Have a leak? Don’t wait for it to get worse.

Our technicians are standing by 24/7 with the equipment to find your leak fast. No unnecessary digging, no guesswork.

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How is a pool light leak fixed?

The most common fix is sealing the conduit hole at the back of the niche with a pool-grade putty or a cord stopper. A gap at the plaster is sealed with underwater putty or epoxy. A cracked niche or conduit takes more work. The light is pulled forward on its spare cord so the niche can be reached without draining the pool.

Pool leak detection in Murrieta usually costs about $250 to $650, and repairs start from about $300 depending on the fix. You get the price before work starts. If the light seems fine but the skimmer area has a crack, see our pool skimmer leak guide.

Is a pool light leak dangerous?

The leak itself is a water loss problem. The risk is water reaching the wiring. Modern pool lights are on GFCI protection and low-voltage transformers in many newer pools, but older Murrieta pools from the 1980s and 1990s may have 120-volt lights. If the GFCI trips or the light flickers, leave it off and have an electrician check it.

Older pools in Copper Canyon, Rancho Bella Vista and Murrieta Hot Springs often still have their original niches and conduits. We also offer leak detection in Temecula for pools just south of town.

Frequently asked questions

How do I know if my pool light is leaking?

Let the pool drop and see where it stops. If it stops near the light, or dye is pulled into the back of the light niche, the niche is likely leaking.

Can a pool light leak be fixed without draining the pool?

Usually yes. The light is pulled forward on its spare cord and the conduit hole is sealed underwater with pool putty or a cord stopper.

Is it safe to swim with a leaking pool light?

Turn the light off at the breaker until it is checked. If the GFCI trips or the light flickers, keep it off and have an electrician look at it.

How much does pool leak detection cost in Murrieta?

Pool and spa leak detection in Murrieta usually costs about $250 to $650. Repairs are priced separately and start from about $300.

Prices are approximate estimates for planning. Your final price depends on your property and is confirmed before work begins.

Where can I get help with this in Murrieta?

Murrieta Leak Pros offers Pool & Spa Leak Detection, Leak Repair & Trenchless Pipe Repair. We serve every Murrieta neighborhood:

We also serve Temecula, Menifee, Wildomar, Lake Elsinore, Winchester, French Valley, Canyon Lake, Hemet and Sun City. See all service areas →

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