We are a family-run company, serving the Oconomowoc area for over 60 years. Offering 3rd generation master plumbers, we have over 100 years of combined plumbing experience. This lets us fix nearly anything right the first time.
Our large inventory of in stock parts, along with modern tools, allows us to expedite every job we do. As such, we service all major brands of plumbing and pumps.
We have over 5000 happy and loyal customers. Call us for references in your neighborhood.
I needed 4 things done at my home all at once. They worked with my schedule. Showed up on time, fixed everything very fast, kind,courteous & professional. I expected the final bill to be 2X-3X what it was very inexpensive. I am very happy and highly recommend this company. Honest, good, hard working people!
JM
Joan Marie Miglautsch
Sep 9, 2025
5.0
This is the third time I use your services. I want to express my gratitude for your work. For the quick response. Of course, I will use your services in the future.
DK
dave kielich
Oct 13, 2023
1.0
$ 581.70 ??????? small vanity sink needed new water lines and shut off valves , plus a 5ft pipe had to be opened with machine,, this process took over 3 1/2hrs do to slowness of plumber and charged 396.00for labor + 180.00 for parts and an exchtra 69.00 for the machine, which took 10 minutes to set up and use,,, with thtotal bill with tax being 581.70 this charge also included a trip back to warehouse because dint have parts with him,,,, never again would i use this service, and to make matters worst the sink shut off valves LEAK!!!!!! Ben kielich 10/13/2023 offered to take off 50.00 of bill, because fely quilty!!!! and they were.
RK
Roxanna Kemppainen
Oct 8, 2021
5.0
I called them in an emergency type need and within an hour they were on the way and in less than an hour after arrival they were done and toilet was working perfectly, no more leaking! Super fast and responsive, very friendly and compassionate to my situation, and tidy too!! Thank you!
Frequently Asked Questions About Sterling Mainz & Sons Plumbing
What areas do you serve?
Sterling Mainz & Sons Plumbing & Pumps Inc serves Oconomowoc, WI and its neighboring areas. Our coverage includes Ixonia, Hartland, Delafield, Okauchee, Pewaukee, Sullivan, Dousman, Wales, Summit, Nashotah, Ashipunn, Watertown, Merton, North Lake, and Stone Bank.
What types of water heaters do you install and service?
Our company installs and services all types of water heaters, including both tank and tankless models. Our skilled technicians can assist you in choosing the most efficient and cost-effective option for your home.
How can I tell if I need a water softener?
Signs that you may need a water softener include hard water stains, dry skin, or mineral buildup on fixtures. We offer free water testing and provide personalized recommendations based on your home's specific needs.
What's the difference between drain and sewer cleaning?
Drain cleaning typically addresses clogs in household fixtures like sinks and tubs, while sewer cleaning focuses on blockages in the main sewer line. Our company provides both services, including camera inspections and hydro jetting.
Are your plumbers licensed and insured?
Yes, all our technicians are fully licensed and insured. They have received training to ensure compliance with Wisconsin plumbing codes and safety regulations.
How do I prevent my sump pump from failing?
Regular maintenance is key to sump pump reliability. We offer sump pump inspection services, battery backup installations, and replacement options to help keep your basement dry year-round.
Do you provide warranties on your work?
Yes, we offer warranties on both our labor and the parts we use. The specific terms may vary depending on the service provided. We encourage customers to inquire about warranty details when scheduling their appointment.
What areas does Sterling Mainz & Sons Plumbing serve?
Sterling Mainz & Sons Plumbing serves Oconomowoc, WI and surrounding areas including Ixonia, Hartland, Delafield, Okauchee, Pewaukee, Sullivan, Dousman, Wales, Summit, Nashotah, Ashipunn, Watertown, Merton, North Lake, and Stone Bank.
What types of water heaters do you install and service?
We install and service all types of water heaters, including tank and tankless models, helping you choose the most efficient option for your home.
How can I tell if I need a water softener?
Signs include hard water stains, dry skin, or mineral buildup. We offer free water testing and personalized recommendations for your home.
What is the difference between drain and sewer cleaning?
Drain cleaning targets household fixture clogs, while sewer cleaning addresses blockages in the main sewer line. We offer both services including camera inspections and hydro jetting.
Are your plumbers licensed and insured?
Yes, all technicians are fully licensed and insured, trained to comply with Wisconsin plumbing codes and safety standards.
How can I prevent my sump pump from failing?
Regular maintenance is essential. We provide sump pump inspections, battery backup installations, and replacement options to keep your basement dry year-round.
Do you provide warranties on your work?
Yes, we offer warranties on labor and parts, with terms varying by service. Please inquire about warranty details when scheduling.
What are your business hours?
We are open Monday through Friday from 7:30 AM to 5:00 PM, and on Saturday from 7:30 AM to 12:00 PM. We are closed on Sundays.
Where is Sterling Mainz & Sons Plumbing located?
Our address is 114 S Main St., Oconomowoc, WI 53066, USA.
Are there places near Sterling Mainz & Sons Plumbing where customers can relax or grab a bite?
Yes, nearby you can visit Thirsty Bird Saloon for drinks, Eckert's Hometown Diner for breakfast, and Shotzy's Country Rock Bar for entertainment after your plumbing service.
Can customers find other services near Sterling Mainz & Sons Plumbing?
Absolutely, nearby businesses like Trillium Massage and Elysium Massage offer relaxation, while Valuables On Video LLC and Paragon Media Group provide event photography services.
Are there any local shops near your location customers might visit?
Yes, customers can explore Apex Vape Ocon for e-cigarettes and tobacco products, and visit beauty salons such as Catherine's Class Act Beauty or Bence Barber for personal care services nearby.