Harbor Line Plumbing has served King of Prussia homeowners for over 18 years — licensed, insured, and owner-operated by Dave Kowalski. Free estimates on every job.
From Valley Forge-area colonials to newer KOP townhome communities, we handle everything from builder-grade fixture upgrades to water heater replacements in tight utility closets.
Whether it’s an urgent repair or a project you’ve been planning for months, you get the same deal every King of Prussia customer gets: a clear written estimate up front, work done to current code, and a job site left cleaner than we found it.
We’re local — based in Norristown — so response times in King of Prussia are fast, and we know the housing stock, the inspectors, and the quirks of the area’s homes.
✓ Licensed & insured in Pennsylvania
✓ 18+ years serving Montgomery County
✓ Owner on every job — no rotating crews
✓ Free written estimates
✓ 5.0-star rated on Google, Nextdoor & Angi
Tank, tankless, gas, or electric — we install, repair, and replace water heaters sized right for your household, usually within 24 hours of your call.
Learn More → 🌀Slow tub, backed-up kitchen sink, gurgling floor drain — we clear it with the right tool for the line, not just a bottle of chemicals that eats your pipes.
Learn More → 💧A mystery stain on the ceiling or a water bill that doubled overnight — we find the leak without tearing your house apart, then fix it right the first time.
Learn More → 🚿Remodeling, upgrading fixtures, or moving a sink? We handle the rough-in and the finish work so your remodel passes inspection and works beautifully.
Learn More → 🕳️Sewer trouble is the one plumbing problem you can't wait on. We camera, clear, repair, and replace main lines — with trenchless options where the yard allows.
Learn More → 🚨When the basement is taking on water or a pipe lets go at 10 PM, you need a plumber who picks up. Harbor Line responds fast to keep damage to a minimum.
Learn More →Yes — Harbor Line Plumbing serves all of King of Prussia and the immediate surrounding area. We're based in Norristown, so King of Prussia is squarely inside our everyday service zone.
Yes. Every job gets a clear, written price before we start work. No surprise line items, no "while we're in there" upcharges without your okay.
Absolutely. Harbor Line Plumbing is fully licensed and insured in Pennsylvania, and we pull permits whenever the work requires them.
Call Harbor Line Plumbing — serving King of Prussia and all of Montgomery County with free estimates and 18+ years of experience.