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8 Questions You Should Ask Your Local Plumber

April 25, 2026
Ask these 8 important questions before hiring a local plumber to ensure quality work, clear communication, fair pricing, and dependable long-term service.
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Signs You Need Plumbing Services

March 11, 2026
With an influx of new construction and the constant aging of existing infrastructures, the need for plumbing services will continue to be a vital requirement.
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Learn Why Your Plumbing Company Conducts Gas Line Repairs

January 15, 2026
Are you wondering why your plumbing company conducts gas line repairs? Read this article to learn more information about it, and give us a call today!
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6 Tips for Sewer Care From Your Local Plumber

November 14, 2025
Discover six practical, plumber-approved tips to keep your sewer system running smoothly. Contact Sterling Mainz & Sons Plumbing & Pumps, Inc to learn more!
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5 Ways Plumbing Contractors Can Help Increase Your Home's Efficiency

September 12, 2025
Expertise from plumbing contractors can significantly enhance a home's efficiency, leading to savings on utility bills and reducing overall water wastage.

Expert Plumbers

Delafield, WI and Oconomowoc, Hartland

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Certified Technicians

Over 100 Years of Experience

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Expert Plumbing Solutions Since 1927

For nearly a century, Sterling Mainz & Sons Plumbing & Pumps, Inc has been the trusted name in plumbing services for Oconomowoc and the surrounding communities. As a proud, family-owned business established in 1927, we bring the strength of three generations of plumbing expertise to every project we undertake. With over 100 years of combined experience, our team of certified technicians is equipped to handle a full spectrum of plumbing needs—from routine maintenance to complex installations and system upgrades.

Whether it's a new water heater, a well pump system, or a custom water treatment solution, we deliver reliable, high-quality service with a personal touch. We're proud to serve our community with the knowledge, skill, and dedication that have been our hallmarks for decades. Our commitment to excellence is evident in our advanced training and certifications from industry leaders like A. O. Smith and Water-Right. Ready to experience the excellency of our team of plumbers in Hartland, WI? Give us a call today to learn what we can do for you!

Unparalleled Expertise and Customer-Centric Service

Unparalleled Expertise and Service

FREE, Next-Day Estimates

Certified Technicians

Over 100 Years of Experience

Locally and Family-Owned

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Founded in 1927

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Water Heater Installations

and Repair Services

Our certified technicians specialize in water heater installations and repairs, ensuring your home has a reliable source of hot water. We work with various types and brands of water heaters, providing advice on the most efficient and cost-effective solutions for your needs.

Water Softener

Installations

As certified technicians for Capitol, Water-Right and Water-Right Softeners, we offer professional water softener installations to improve your water quality. Our team will assess your water hardness and recommend the ideal system to protect your plumbing and enhance your water.

Drain Cleaning and

Inspection Services

As the finest plumbers in Hartland, WI, we provide thorough drain cleaning services and detailed inspections to prevent clogs and maintain the health of your plumbing system. Our advanced equipment allows us to identify and address issues before they become major problems, saving you time and money.

Sewer Cleaning and

Inspection Services

Our sewer cleaning and inspection services use state-of-the-art technology to diagnose and resolve sewer line issues. We offer solutions to keep your sewer system functioning efficiently, preventing backups and protecting your property from potential damage.

Sump Pump Installations

and Maintenance

Protect your basement from flooding with our sump pump installations and maintenance services. We ensure your sump pump is properly installed and regularly maintained to provide reliable protection against water damage during heavy rains or snowmelt.

Kitchen and Bathroom

Plumbing Services

From faucet replacements to complete custom plumbing, our team handles all aspects of kitchen and bathroom plumbing. We work efficiently to minimize disruption to your daily routine while delivering high-quality results that enhance your living space.

Water Line Repairs

Our team of experienced plumbers is equipped to handle water line repairs of all sizes. We use advanced diagnostic tools to locate leaks and damage, providing you with efficient repairs that restore your water supply with minimal disruption to your property.

Gas Line Repairs

Safety is our top priority when it comes to gas line repairs. Our certified technicians are trained to detect and repair gas leaks promptly, ensuring the security of your home and family. We adhere to strict safety protocols and local regulations in all our gas line work.

Well Pump Services

As specialists in well pump services, we offer comprehensive solutions for installation, maintenance, and repairs. Our team's expertise ensures your well pump system operates efficiently, providing your home with the reliable water supply it deserves.

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Here's what our satisfied customers are saying...

At Sterling Mainz & Sons Plumbing, we take pride in providing exceptional plumbing to our customers. We would be grateful if you could share your thoughts about our company with others. Your feedback helps us improve and helps others make informed decisions. Please take a moment to leave a review  of Sterling Mainz & Sons Plumbing and let others know what you think.

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FAQs

  • Why should I choose Sterling Mainz & Sons over other local plumbing contractors?

    When dealing with home or commercial utility systems, you deserve a company that combines ironclad reliability with deep, local field experience. As trusted plumbers in Delafield, WI, we have earned a lifelong reputation for delivering top-notch plumbing solutions that prioritize structural quality and customer satisfaction.


    Our team of plumbers in Hartland, WI doesn't just want to provide a quick fix-we aim to build long-term relationships based on honesty, transparent communication, and technical excellence. Whether you need routine maintenance or an urgent complex repair, we are dedicated to going above and beyond to exceed your expectations.

  • What specific residential and commercial plumbing services do you provide?

    Our expert team of plumbers in Delafield, WI is fully licensed, bonded, and equipped to handle plumbing needs of all sizes and complexities across Waukesha County.


    Residential Support

    • Fixtures and maintenance: Leaky faucet repair, toilet rebuilds, and clog removals
    • System installation: Full-scale piping renovations, pump diagnostics
    • Water dynamics: Well pump service, water heater installations

    Commercial Support

    • Fixtures and maintenance: High-volume restroom service, drain clearings
    • System installation: Mainline configurations, multi-unit utility hookups
    • Water dynamics: Commercial pump systems, backflow prevention

    Our adaptive plumbers in Delafield, WI utilize state-of-the-art equipment and premium, commercial-grade materials to ensure every project delivers exceptional, long-lasting results.

  • What does your step-by-step process look like to ensure a smooth service call?

    Our plumbers in Hartland, WI execute a smooth, predictable four-step workflow on every job site:


    • Step 1 - Consultation and root-cause inspection: We actively listen to your concerns and perform a meticulous physical inspection. Our team identifies the actual source of the malfunction and explains our findings clearly so you can make an informed decision.
    • Step 2 - Upfront pricing approval: Before a single tool is pulled from our trucks, our plumbers in Delafield, WI provide an itemized, clear quote.
    • Step 3 - Professional execution: Our certified plumbers in Hartland, WI complete the technical work safely, efficiently, and cleanly.
    • Step 4 - Verification check: We run a comprehensive final inspection to verify that your system is functioning perfectly before we declare the job complete.

  • How do you protect property owners from surprise fees or unexpected surcharges?

    We believe that honest work starts with honest numbers. You will never find hidden fees, surprise trip surcharges, or fine-print traps when working with Sterling Mainz & Sons Plumbing & Pumps, Inc.


    Before any manual labor or pipe assembly begins, our professional plumbers in Delafield, WI provide you with a fair, competitive, and completely transparent written estimate. This ensures you can budget effectively and gain the maximum value for your plumbing investment.

  • How can I get in touch with your team to schedule an inspection or request a quote?

    Getting expert plumbing help to your property is simple and fast. If you are searching for reliable plumbers in Delafield, WI to tackle a current project or look over an aging well pump system, look no further than our local office.


    Reach out to our friendly dispatchers or connect with our plumbers in Hartland, WI today to schedule your initial consultation. Our field technicians are fully prepped, stocked, and ready to assist you right now!

  • What is a constant-pressure system, and can it fix the low water pressure in my well-reliant home?

    If you live on a private well and notice your shower pressure drops to a weak trickle whenever someone turns on a garden hose or runs the washing machine, a standard well pump setup is likely to blame. Traditional setups run on rigid pressure cycles (usually turning on at 30 PSI and off at 50 PSI), causing noticeable pressure drops. A modern constant-pressure system from plumbers in Hartland, WI utilizes a variable-frequency drive (VFD) that monitors your water usage in real-time, instantly adjusting the well pump's motor speed to maintain a steady, unyielding stream of water regardless of how many fixtures are running at once.