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Castlewood Plumbing | Trusted Plumbing Services in Cottleville, MO

Your Local Plumbing Experts You Can Count On

When plumbing problems strike, you need a team that treats your home like its own. At Castlewood Plumbing, we’re proud to be the go-to choice for plumbing services in Cottleville, MO, and the surrounding areas, including St. Peters, O’Fallon, and Weldon Spring.



With years of hands-on experience and a reputation built on integrity, our licensed plumbers handle everything from leak repairs and toilet installations to water heater replacements and backflow prevention. Whether it’s a small drip or a major project, you can trust us to get the job done right — every single time.

Why Homeowners in Cottleville Choose Castlewood Plumbing

At Castlewood Plumbing, we understand that plumbing issues can be stressful and disruptive. That’s why we focus on making your experience as smooth and worry-free as possible. Here’s why our customers keep calling us back:

  • Expert Craftsmanship: Every job is done with precision and attention to detail.
  • Comprehensive Services: From basic repairs to full system installations, we handle it all.
  • Licensed & Insured Professionals: Your home is in safe, qualified hands.
  • Friendly, Local Team: We’re your neighbors, not a faceless franchise.
  • Upfront, Honest Pricing: No hidden fees. No surprises.
  • Reliable Emergency Service: We’re here when you need us most.

We don’t just fix plumbing, we build long-term relationships based on trust, quality, and outstanding customer care.

Our Full Range of Plumbing Services in Cottleville, MO

Your plumbing system is the heart of your home, and we keep it running efficiently and safely. Here’s how we can help:

Water Heater Installation & Repair

Hot water should never be a luxury. Whether your water heater needs a quick repair or a complete replacement, we’ll make sure you have reliable, efficient hot water every day. We work with all major brands and offer energy-efficient options for lower utility bills.

Toilet Installation & Repair

From replacing old, leaky toilets to fixing flushing issues, our team ensures your bathroom stays comfortable and functional. We install high-efficiency models that save water without sacrificing performance.

Faucet Installation & Service

A dripping faucet can waste gallons of water and money. Let us stop the drip and upgrade your faucets with modern, durable fixtures that look as good as they perform.

Collars, Supply Stops & Main Stops

Properly functioning water controls are essential to prevent leaks and maintain pressure. We install and service collars, supply stops, and main stops to keep your plumbing system in top shape.

Shower Valves & Faucet Cartridges

Tired of inconsistent water temperature or low pressure? Our experts repair and replace shower valves and faucet cartridges to restore comfort and performance.

PR Valves & Expansion Tanks

Protect your home from dangerous pressure buildup with professional installation of pressure-reducing valves (PRVs) and expansion tanks. These critical components help extend the life of your plumbing system.

Waste & Overflow & Shower Drains

If your tub or shower is slow to drain, we’ll find and fix the problem fast. Our team cleans, replaces, or upgrades your waste and overflow systems to ensure water flows freely.

Backflows & Stack Replacements

We specialize in backflow prevention to keep your drinking water safe. For older homes, our stack replacement services can resolve recurring drain or venting problems efficiently.

Water Softeners

Hard water doesn’t just affect taste, it can damage pipes, fixtures, and appliances. We install high-quality water softeners to help extend the life of your plumbing system and make cleaning easier.

Garbage Disposals

We install and repair reliable garbage disposals to make your kitchen cleanup quick and convenient.

Leak Repair

No leak is too small to ignore. From ceiling drips to hidden pipe leaks, we use advanced detection tools to fix issues fast and prevent costly water damage.

Recirculation Pumps

Say goodbye to waiting for hot water. Our recirculation pump solutions ensure instant hot water at every faucet, improving comfort and efficiency.

Serving Cottleville and Surrounding Communities

We’re proud to serve Cottleville, MO, and nearby areas including O’Fallon, St. Peters, Weldon Spring, and Dardenne Prairie. As a locally owned business, we understand the unique plumbing needs of homes in our community — from hard water issues to seasonal temperature changes that affect your pipes.



When you choose Castlewood Plumbing, you’re supporting a local company that genuinely cares about keeping your home safe, efficient, and comfortable.

Your Comfort Is Our Commitment

Every home deserves dependable plumbing. That’s why we don’t just provide quick fixes — we deliver lasting solutions. Whether you need an emergency plumber today or you’re planning an upgrade, Castlewood Plumbing is here to make your life easier.



Our team is dedicated to:

  • Responding quickly and courteously
  • Providing honest advice, never upselling
  • Using only quality materials and parts
  • Leaving your home cleaner than we found it

You’ll see why so many of our customers say, “I’ll never call another plumber again!”

Frequently Asked Questions

  • What plumbing services do you offer in Cottleville, MO?

    At Castlewood Plumbing, we offer a complete range of residential plumbing services — including water heater installation, toilet repair, leak detection, garbage disposal replacement, water softeners, and backflow prevention. No matter the issue, our licensed plumbers are ready to help.

  • How quickly can you respond to a plumbing emergency?

    We understand plumbing problems can’t wait. That’s why we provide fast-response plumbing services in Cottleville and nearby areas. If you have an urgent issue like a burst pipe or no hot water, call us right away — we’ll dispatch a technician as soon as possible.

  • Do you repair and install tankless water heaters?

    Yes! We repair, maintain, and install tankless water heaters as well as traditional tank-style systems. Our team can help you choose the right model for your home and ensure a professional installation for maximum efficiency.

  • What areas do you serve besides Cottleville?

    In addition to serving Cottleville, MO, we proudly provide plumbing services in St. Peters, O’Fallon, Dardenne Prairie, Weldon Spring, and surrounding communities. We’re local and always nearby when you need us most.

  • Why should I choose Castlewood Plumbing over other plumbers?

    Homeowners in Cottleville trust Castlewood Plumbing because we combine expert workmanship with friendly, honest service. We’re locally owned, fully licensed, transparent with pricing, and committed to doing every job right the first time.

Get Started Today – Call Your Local Cottleville Plumbers

Don’t let plumbing problems disrupt your day. Get fast, friendly help from your neighbors at Castlewood Plumbing.



Whether it’s a leaky faucet, a broken water heater, or a full home plumbing upgrade, we’re ready to help. Let’s keep your home’s plumbing flowing smoothly, today and every day.