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Trusted Plumber in St. Clair, MO | Castlewood Plumbing

Looking for a reliable plumber in St. Clair, MO, you can count on them day or night? At Castlewood Plumbing, we treat every call like a royal mission to fix your plumbing right and keep your home comfortable and stress-free. Our friendly team loves helping neighbors in St. Clair solve plumbing problems fast with straightforward pricing, same-day service, and skilled craftsmanship you can trust. Whether it is a minor leak, a clogged drain, or a big installation project, our licensed and insured professionals have the training and tools to get the job done right the first time.


We have proudly served West St. Louis County and the surrounding areas for over 30 years. Formerly Thome Plumbing Co., we built our reputation on transparent service and dependable solutions. When you choose Castlewood Plumbing, you are choosing a local company that values honesty, quality, and your peace of mind.

Call Now to Get Fast Plumbing Help in St. Clair, MO

Plumbing issues rarely happen on a schedule. That is why our St. Clair plumbers are available when you need them most. You can reach us at 636-394-6737 to schedule service or request an appointment online. We offer same-day appointments and 24-hour emergency service, so a burst pipe or overflowing sink won’t leave you waiting.


Our team arrives in fully stocked service vehicles ready to diagnose and solve your problem quickly. We will explain your options clearly and in a friendly way before beginning any work, so you always know what to expect. At Castlewood Plumbing, your satisfaction is our priority.

Get Quick Repairs for Leaks and Water Line Problems

Leaking pipes and waterline issues can waste water and cause damage if left unattended. Our experienced plumbers have the equipment to locate leaks hidden behind walls or under slabs and fix them with precision. From minor drip repairs to water line replacement, we handle it all. Signs you need leak repair include:

  • Unexplained increase in your water bill
  • Damp spots on floors or walls
  • Low water pressure in taps
  • Pooling water near fixtures

When you call Castlewood Plumbing, we use advanced leak-detection tools to pinpoint the exact source of the problem and repair it efficiently, without unnecessary disruption.

Fix Clogged Drains and Backed Up Pipes Today

A slow or clogged drain can start as a minor annoyance and quickly become a major headache. Our St. Clair plumbers use powerful hydrojetting and professional drain-cleaning techniques to clear stubborn blockages in kitchen sinks, bathroom drains, and main sewer lines. Common causes of clogged drains include:

  • Hair and soap buildup
  • Food particles are collecting in pipes
  • Grease and oil hardening in kitchen drains
  • Tree root intrusion in sewer lines

We do more than just clear the clog. We inspect your plumbing to identify underlying issues and ensure long-lasting results. Ask about our camera inspection service to see inside your pipes and catch problems early.

Upgrade or Repair Your Water Heater with Confidence

Hot water is essential for daily life. If your water heater is not performing as it should, has rusty water, or runs out of hot water too quickly, it may be time for repair or replacement. Castlewood Plumbing installs and repairs all types of water heaters, including tank and tankless systems. We help with:

  • Water heater installation
  • Water heater repair and maintenance
  • Diagnosing temperature issues
  • Replacing old or inefficient units

Our technicians will assess your household needs and recommend the right system that matches your usage and budget. With proper installation and maintenance, your water heater can deliver reliable performance and energy savings.

Install and Service Sump Pumps to Protect Your Basement

St. Clair, MO homes can be vulnerable to basement flooding during heavy storms. A properly installed sump pump helps protect your property by removing excess water before it causes damage. Our team offers sump pump installation, repair, and maintenance to keep your home dry and secure. Signs your sump pump needs service:

  • Strange noises when running
  • It runs constantly without shutting off
  • It does not activate during high water conditions
  • Visible rust or corrosion on components

We can recommend the best sump pump for your property's size and test it to ensure it is ready when you need it most.

Upgrade Your Home with Water Treatment and Softeners

Hard water and poor water quality can affect your plumbing fixtures, appliances, and even skin and hair health. Castlewood Plumbing offers water softener systems and advanced water treatment solutions to improve your water quality in St. Clair homes. Benefits of professional water treatment:

  • Softer skin and cleaner hair
  • Less scale buildup in pipes and appliances
  • Better tasting water
  • Longer lifespan for water-using appliances

Our plumbers will evaluate your water quality and recommend tailored solutions that fit your home and lifestyle. Whether you want to reduce minerals or improve overall water purity, we provide trusted options and professional installation.

Enjoy Reliable Fixture Services and Plumbing Installations

Updating fixtures or installing new plumbing appliances can improve both function and style in your home. From faucets to garbage disposals and everything in between, Castlewood Plumbing handles installations and services with care. We install:

  • Kitchen and bathroom faucets
  • Garbage disposal systems
  • New toilets and sinks
  • Specialty plumbing fixtures

If a fixture is leaking, malfunctioning, or just outdated, our team will help you select quality products and install them quickly with precise workmanship. We make sure the job is finished cleanly and efficiently so you enjoy the results.

Trust Our Experts for Gas Line Plumbing Needs

Gas lines require experienced professionals due to the safety risks posed by gas leaks or improper installation. Castlewood Plumbing provides safe and reliable gas line services, including:

  • Gas line installation for appliances
  • Gas leak detection and repair
  • Line replacement and upgrades

Your safety is our top priority. We follow strict protocols and use advanced tools to ensure your gas lines are functioning properly and safely.

Professional Piping and Repiping Services

Aging pipes can lead to recurring leaks, low pressure, and water quality issues. Our team offers piping and repiping services to replace outdated or damaged pipes with reliable modern materials. Repiping can improve water flow, prevent leaks, and increase the lifespan of your plumbing system.



We assess your current piping and recommend solutions that improve performance while fitting your budget. Whether your home has copper, galvanized steel, or outdated materials, we can help modernize your plumbing infrastructure.

Camera Inspections to Reveal Hidden Problems

One of the most powerful tools in modern plumbing is the video camera inspection. This technology allows us to visually inspect the inside of your pipes, pinpointing issues without tearing up walls or floors. It is ideal for diagnosing stubborn clogs, root intrusion, pipe damage, and more. Camera inspection benefits:

  • Accurate problem identification
  • Less invasive diagnostics
  • Faster solutions
  • Better long-term planning

Ask about this service when you call so we can bring the right tools for your inspection.

Why Choose Castlewood Plumbing in St. Clair, MO

At Castlewood Plumbing, we go beyond quick fixes to deliver quality plumbing services with integrity and care. Our team has decades of experience serving local homeowners and businesses. You can expect:

  • Transparent Upfront Pricing so there are no surprises
  • Same Day Service to resolve issues quickly
  • 24 Hour Emergency Availability when problems can’t wait
  • Licensed and Insured Professionals for your protection
  • Friendly Technicians with Helpful Explanations
  • Excellent Warranties on Workmanship

We treat every home as if it were our own. From small repairs to complex installations, we deliver solutions that stand the test of time.

Frequently Asked Questions About Plumbing in St. Clair, MO

  • What areas do you serve around St. Clair, MO?

    We proudly serve St. Clair and many surrounding communities in West St. Louis County, including Ballwin, Chesterfield, Ellisville, Eureka, Wildwood, and more. We cover residential and commercial plumbing needs throughout the region.

  • How quickly can you send a plumber for an emergency?

    We offer 24-hour emergency plumbing service. Once you call, we dispatch a licensed technician as soon as possible so you get fast relief from leaks, backups, or other urgent issues.

  • Do you offer financing options for larger plumbing projects?

    Yes. Castlewood Plumbing offers financing options to help make larger plumbing repairs or installations more manageable for homeowners. Ask our team about the options available when you schedule your service.

  • Can you inspect my sewer line without digging?

    Yes. Our camera inspection service allows us to look inside your sewer and drain lines without invasive digging. This helps us quickly and accurately diagnose blockages, breaks, and corrosion.

  • What should I do if I smell gas in my home?

    If you suspect a gas leak, leave the home immediately and call your gas provider and our team for service. Gas leaks are serious and require immediate attention from trained professionals for safety. Castlewood Plumbing offers gas line detection and repair to handle these issues safely.

Schedule Your Service with the Local St. Clair Plumber

When you need plumbing help in St. Clair, MO, pick a team that shows up on time, listens to your concerns, and fixes problems right the first time. Call Castlewood Plumbing at 636-394-6737 or request an appointment online. Our plumbers are ready to bring skill and a positive attitude to your home.