Signs Your Pool Needs Re-Plumbing

Your pool's plumbing is out of sight and out of mind — until something goes wrong. Underground pipes, fittings, and connections deteriorate over time, and Connecticut's freeze-thaw cycles accelerate that process significantly.

At Highland Pools, re-plumbing is one of our core services across Fairfield County. Here are the warning signs we see most often, and what to do about them.

1. Unexplained Water Loss

Every pool loses some water to evaporation — typically 1/4 inch per day in summer. But if you're losing more than that, especially more than 1 inch per week, you likely have a leak.

The bucket test is simple: fill a bucket and set it on the pool step. Mark both the pool water level and the bucket water level. After 24 hours, compare. If the pool dropped more than the bucket, you have a leak — and it's often in the plumbing.

2. Wet Spots in the Yard

Soggy areas, unusually green patches of grass, or standing water near the pool area (when it hasn't rained) are classic signs of an underground pipe leak. In Fairfield County, we commonly see this in pools built 20+ years ago where original PVC joints have degraded.

Pay special attention to areas between the pool and the equipment pad — this is where most plumbing runs.

3. Low Flow or Pressure Problems

If your return jets aren't pushing water like they used to, or the skimmer isn't pulling strongly, the cause might be:

• A cracked pipe restricting flow
• A collapsed section of underground plumbing
• Air leaks in the suction side pulling air instead of water
• Mineral buildup restricting old galvanized or copper pipes

Before assuming it's a pump problem, have the plumbing pressure-tested. Many homeowners in Greenwich and New Canaan have replaced pumps unnecessarily when the real issue was deteriorated plumbing.

4. Air Bubbles in the Return Jets

Persistent air bubbles coming from your return jets indicate an air leak on the suction side of the plumbing system. This could be:

• A cracked pipe between the skimmer and pump
• A failing fitting or union
• A deteriorated o-ring or valve seal

Air leaks reduce filtration efficiency and can damage your pump over time. They're also one of the earliest warning signs that plumbing integrity is compromised.

5. Recurring Freeze Damage

If your pool seems to suffer plumbing damage every winter despite proper winterization, the pipes themselves may be the problem. Old PVC becomes brittle over time and can't withstand Connecticut's freeze-thaw cycles the way it could when new.

This is especially common in pools built before the 1990s in towns like Fairfield, Trumbull, and Stratford, where some original plumbing used thinner-wall pipe or even copper for certain runs.

6. Discolored Water or Staining

If you're seeing rust-colored staining or metallic taste/smell, it could indicate corroding metal pipes (copper or galvanized steel) in your plumbing system. Older Connecticut pools sometimes have copper supply lines that corrode over decades.

This isn't just an aesthetic issue — corroding pipes will eventually fail completely, and the dissolved metals can stain your pool surface permanently, requiring.

7. Your Pool Is 25+ Years Old

If your pool was built 25 or more years ago and has never been re-plumbed, it's likely approaching the end of its plumbing lifespan — even if you haven't noticed obvious symptoms yet. Proactive re-plumbing prevents emergency failures that cause far more damage and cost.

What Does Pool Re-Plumbing Involve?

A full pool re-plumbing typically includes:

1. Excavation: Carefully digging up existing underground plumbing runs
2. Pipe replacement: Installing new Schedule 40 PVC pipe throughout
3. Fitting upgrades: New unions, valves, and connections at the equipment pad
4. Pressure testing: Verifying every line holds pressure before backfilling
5. Backfill and restoration: Replacing soil, sod, or hardscaping over the new pipes

Cost of Pool Re-Plumbing in Connecticut

• Partial re-plumb (1–2 lines): $1,500–$3,500
• Full re-plumb: $4,000–$10,000+ depending on pool size, number of lines, and site complexity
• Emergency repair (single line): $800–$2,000

Timeline

Most re-plumbing jobs take 2–5 days. It's best done during pool opening season or fall before closing, when the pool is already drained or partially drained.

Prevention Tips

• Always use a professional for winterization: Proper line blowing is the single best thing you can do for plumbing longevity.
• Address leaks immediately: Small leaks become big problems. A dripping fitting today is a burst pipe next winter.
• Annual inspection: Have your pool professional inspect plumbing connections during opening and closing.

Get a Plumbing Assessment

Highland Pools provides free plumbing assessments for pool owners across Fairfield County. Whether you're in Westport, Wilton, Ridgefield, Easton, or Danbury, we'll diagnose the problem and give you honest options.