Residential & Commercial Water Testing Companie in Carroll County MD

Servicing Water Heaters and Water Filter Systems in Businesses and Homes for Over 40 Years in Your Community

Water Testing

Water quality should never be something you need to worry about in your home or business, no matter if you live in the country or manage an office in the middle of the city. 


Your water access, from kitchen taps to laundry machines, should always be trusted, safe, and clean. National Water Service has been around for decades and has become a leader in water quality in Carroll County because we believe in affordable, trusted water testing for every home and family.


Our repeat clients rely on us for well pump replacements, water heater installations, water filtration systems, plumbing services, and more. We tackle office water coolers and produce misting with trusted equipment that provides safe water, every time.


National Water Service is your one-stop-shop for all water quality needs in Carroll County, MD. We can provide a free consultation that tests your water’s current quality, so you have nothing to lose and a lot to gain by calling us today.


Live the National Water Service way, with safer, cleaner water from a low maintenance system that is simple to service.

Residential Water Testing that Keeps Your Drinking Water Safe

City Water In-Home Water Treatment. A Reverse Osmosis for up too 99.9% contaminant free cooking & drinking water, a Water Softener for Hard Water and a Carbon Tank.

The drinking water in your home should be safe, clean, and trusted, no matter where you live. Whether you have city water or well-provided water in the country, there are solutions for an easy-to-service water filtration system that works for you and your family. From cooking to showering to all the appliances in between, we have your water quality covered. 


National Water System provides reliable water testing when purchasing a new home or catching up on your to-do list. Our team is available to give you answers and provide water treatment solutions for whatever your water testing results show. 


Home residential services from National Water Service also expand to well repairs, water heater installations, and we are a trusted plumbing company, making us the one-stop water company you need. 


Call or email today for:


When our team members work with you, we put your needs first. Our customer service quality is so reliable that clients continue to call us for decades to return to their homes when they need water services. Put your home in the hands of our team — we are reliable and our quality is unbeatable.

Unrivaled Commercial Water Services for Grocery Stores, Offices, and More

Whole Foods misting services

We are a leading commercial water service company in Carroll County, MD because we understand safe, clean water does not stop at your home. Businesses and commercial properties have water needs, and we have the water solutions for them all.


Some of the many commercial water services we offer include:


The National Water Service crewmen have been proven reliable, trustworthy, and exceedingly excellent in all water projects we are hired for. Our work includes a finish that is neat, tidy, and organized, so you can inspect your lines whenever you need to, no confusion or hassle, and follow-up services can be completed quickly. 


Don’t let another day pass with sub-par water quality being provided to your customers, employees, or produce maintenance. Contact the National Water Service team to inquire about obtainable, functioning commercial water filtration systems. 

Emergency Water Services in Carroll County that Work for You

new constant pressure pump and well cap replacement

Our clients come first, always, which is why we offer seven-day-a-week emergency water services to Carroll County, MD.


We listen when our clients ask us for more services tailored to their needs, to ensure we can be the one water company for all home or business needs. This is why we are now becoming a leading plumbing company in Carroll County, with a master plumber and crew on staff.


The extent of our services is unrivaled by any other water company servicing your community. We have been a leader in the water service industry for forty years because we are committed to the quality of our work and always want to be a neighbor t0 our clients that you can depend on. 


Talk to us about questions, concerns, or to schedule a service. We have special offers for new clients, so there is nothing to lose when you work with us. We promise to put your mind at ease and get you back to enjoying your home and business with trusted water services that are no hassle. 

We Service Your City! 




New Windsor



Union Bridge