St. Davids is widely considered one of the most prestigious and desirable communities on the Main Line. It strikes a balance that few other towns can achieve, offering the quiet, estate-style privacy of Wayne while remaining incredibly connected to the energy of Lancaster Avenue. Whether you are living near the historic grounds of Eastern University or in a renovated stone colonial near the St. Davids Golf Club, you understand that maintaining a home here requires attention to detail. Since 2009, our team has been the quiet partner for St. Davids homeowners who expect their mechanical systems to work as flawlessly as their homes look.
We are not a franchise. We are a locally owned business with over 25 years of industry experience in our leadership. We know this zip code (19087) intimately. We know that while the homes are beautiful, the water infrastructure feeding them can be aggressive. St. Davids is primarily served by public water (Aqua Pennsylvania), and while it meets federal safety standards, “safe” does not always mean “clean” or “soft.” We believe in radical honesty about what is coming out of your tap so you can make informed decisions for your family.
The Hidden Cost of Hard Water in St. Davids
Public water in St. Davids is notoriously hard. It is rich in calcium and magnesium dissolved from the limestone aquifers in the region. While these minerals aren’t toxic to drink, they are devastating to high-end plumbing fixtures. If you have noticed white, crusty buildup on your faucets, spots on your glass shower doors that won’t scrub off, or reduced pressure in your rainfall showerheads, that is scale. It silently destroys tankless water heaters and clogs internal valve components in dishwashers and washing machines. We install high-efficiency water softeners that protect your investment and give your water a luxurious, silky feel.
Chlorine and Water Quality
To keep the water safe during its journey through the miles of pipes under the Main Line, the municipality uses chlorine (and often ammonia to form chloramines). This is necessary for sanitation, but it leaves your water tasting like a swimming pool and drying out your skin and hair. Many residents in St. Davids are choosing to install whole-home carbon filtration systems. These systems strip out the chlorine and chemical byproducts at the point of entry, providing spa-quality water from every tap in your house.
We love working in St. Davids because the community appreciates quality. After we have wrapped up a project at your home, you might spot our trucks parked near Triple Crown Restaurant at the Radnor Hotel for a quick lunch, or we might be grabbing dinner at At The Table just down the road. We also appreciate the incredible beauty of the area, from the perfectly manicured greens of the St. Davids Golf Club to the quiet, tree-lined residential streets. We are your neighbors, and we treat your home with the same respect we treat our own.
For detailed information on your local water quality, you can review the Aqua Pennsylvania Water Quality Reports or check the Radnor Township website for infrastructure updates.
Comprehensive Water Quality Solutions for St. Davids Residents
Our philosophy is simple: Test, don’t guess. We never assume we know what is in your water until we test it right in front of you. We do not use high-pressure sales tactics or scare tactics. Instead, we act as consultants. We show you the data, explain the chemistry, and offer solutions that fit your specific needs and plumbing architecture.
Common Questions from St. Davids Homeowners
Is the water in St. Davids safe to drink?
Yes, it meets legal safety limits. However, legal limits often lag behind current health research. Many residents are concerned about chlorine byproducts, PFAS (“forever chemicals”), and nitrates. We offer drinking water systems and filtration options that go far beyond standard municipal requirements. You can read more about these hidden risks in our article “How to Know If Your Water Is Making You Sick”.
Why do my high-end appliances fail prematurely?
It is almost always hard water. High-efficiency appliances (like Miele or Bosch dishwashers and tankless water heaters) have tight tolerances. Scale buildup from hard water chokes these systems, causing sensors to fail and heaters to burn out years earlier than they should.
Do you service existing systems?
Absolutely. We can service and repair most major brands of water softeners and filtration systems, even if we did not install them. If your system is repairable, we will fix it. If it’s dead, we will tell you honestly.
What Your Neighbors Are Saying
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“Awesome service by Mark and his team to help resolve a ruptured softener and installation of a new unit! Mark took a call off hours and was able to dispatch someone immediately. When it came to the new unit, Mark knows his stuff. As a chemical engineer, I was able to talk through the details of the resin bed design with Mark and the pros/cons of his. He is very knowledgeable of the systems and the chemistry.”
— Dan (Verified Review)
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“We had a system installed 9 years ago… and recently called for some service/maintenance. They sent out a tech named Sam, who did an excellent job doing all the required maintenance to both the iron breaker and water softener. Since I first met Mark years ago when he designed our system, I’ve always thought Dierolf was a good company to do business with.”
— Tom H. (Verified Review)
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“Staff was very forthcoming with information, options, costs, and answered any question we had. They were polite, professional, courteous. Work was done to expectation, exceeded expectation, and continue to work with additional service as required beyond that of the original call.”
— Brian (Verified Review)
If you are ready for a different kind of plumbing experience—one based on competence and transparency—we are ready to help. Contact us today to schedule your free water analysis.
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New customers get a FREE water test, including our In-House TC test for homes on wells, PLUS get $100 off the installation of a Water Treatment System!
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Bryan was very professional, courteous, and efficient. Great service, thank you!
Great job installing our new water filtration system! Installers were very communicative and efficient. Well done.
Very very helpful and nice people! Wow i thought companies that care were gone not so!!! Dierolf’s people care and i think it’s a real reflection of the owner and how he runs his company and actually cares!! Thank you for a super great job and for caring!!
Service was great and very efficient. The guys were very friendly and quickly replaced the pump without any issues. Thank you.
They did a great job installing a new toilet in my bathroom. They were neat, clean, and paid attention to detail. Chris answered all of my plumbing questions without hesitation. Very satisfied... Highly recommend
