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Founded in 1921
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Over a Century of Trusted Plumbing & Heating Solutions for North Jersey
Since 1921, William J. Guarini Inc. has been delivering dependable plumbing and heating services throughout the North Jersey area. As a locally owned, union company employing only UA Local 24 members, we bring skilled craftsmanship and integrity to every residential and commercial project we handle.
Our fully insured and bonded team consists of thoroughly vetted, background-checked professionals ready to tackle any plumbing challenge. From routine maintenance to emergency assistance, we're here with free on-site estimates and warranties on workmanship and materials. Contact us today to experience the difference that over 100 years of service makes.
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Why Choose Us
Free, On-Site Estimates
Fully Bonded and Insured
Serving the Area for Over 100 Years
Warranties on Workmanship and Materials
Locally Owned

Excavation
When plumbing issues require digging, our excavation services get the job done safely and efficiently. We handle underground pipe repairs, replacements, and installations with minimal disruption to your property.
Gas Line Services
Gas line work requires specialized knowledge and strict safety protocols, which our certified team delivers on every project. We handle gas line installations, repairs, and inspections for both residential and commercial properties.
Plumbing Services
Keep your plumbing system running smoothly with trusted plumbing services from William J. Guarini. We provide reliable emergency plumbing repairs, frozen pipe repair, plumbing fixtures, shower installations, and more to help keep your home or business comfortable and functioning at its best.
Sewer and Drain Cleaning and Repairs
From stubborn clogs to aging sewer and drain systems, we address all drain and sewer issues with precision and care. Our team uses modern techniques to diagnose problems quickly and deliver lasting solutions.
Water Heater Services
Enjoy dependable hot water with expert water heater services from William J. Guarini. We provide professional installation and repair for both standard and tankless water heaters, helping ensure efficient performance, reliable comfort, and long-lasting results for your home or business.
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Here's what our satisfied customers are saying...
At , William J. Guarini Inc. we take pride in providing exceptional plumbing services to our customers. We would be grateful if you could share your thoughts about our business with others. Your feedback helps us improve and helps others make informed decisions. Please take a moment to leave a review of William J. Guarini Inc. and let others know what you think.
How can I tell if a hidden plumbing leak needs professional attention?
Unexpected increases in water usage, damp spots, peeling paint, musty odors, or unexplained water stains can indicate a concealed plumbing leak. Some leaks develop behind walls, beneath floors, or around connections that are difficult to inspect without professional equipment. As a plumber in Jersey City, NJ, we can evaluate suspicious areas and determine whether a plumbing component is contributing to the problem. We recommend addressing leaks promptly because prolonged moisture exposure can affect surrounding building materials and potentially turn a relatively contained plumbing problem into a larger property concern.
Why does my home have inconsistent water pressure?
Water pressure can change for several reasons, including aging pipes, mineral buildup, partially closed valves, leaks, or problems with the municipal supply. When low pressure affects only one fixture, the cause may be localized, while widespread changes can indicate a broader plumbing concern. As a plumber in Jersey City, NJ, we can inspect your system and identify factors contributing to inconsistent pressure. We recommend an evaluation when pressure suddenly changes, continues declining, or affects multiple areas because the appropriate solution depends on identifying the underlying cause rather than addressing the symptom alone.
When should older plumbing pipes be professionally inspected?
Older pipes do not automatically require replacement, but we recommend periodic evaluations to identify corrosion, deterioration, recurring leaks, or other developing concerns. We can also inspect plumbing when you are purchasing an older building, planning renovations, or experiencing repeated problems. As a plumber in Jersey City, NJ, we examine accessible components and can recommend further evaluation when conditions suggest a larger issue. Understanding the condition of your existing pipes can help you make informed maintenance decisions instead of waiting until a significant leak or another plumbing failure disrupts your property.
Why do plumbing problems sometimes keep returning?
Recurring plumbing problems can indicate that an earlier repair addressed the immediate symptom without resolving the underlying condition. We often evaluate repeated clogs, leaks, pressure changes, or slow drainage to determine whether aging components, improper installation, damaged piping, or another issue is responsible. In some cases, we may recommend professional drain cleaning to address buildup or recurring blockages contributing to drainage problems. As a plumber in Jersey City, NJ, we can evaluate the broader plumbing system to determine why the same concern continues returning and recommend an appropriate solution.
Should plumbing be inspected before a major renovation?
Yes. When you are renovating a kitchen, bathroom, laundry area, or another space with plumbing, we can evaluate existing pipes and connections before new finishes are installed. Older or deteriorated plumbing discovered after construction may be more difficult to access. By working with us as your plumber in Jersey City, NJ during renovation planning, we can determine whether existing components are suitable for the proposed changes. We can also coordinate necessary plumbing modifications with other construction work, reducing the likelihood that completed surfaces will need to be reopened to address previously unidentified concerns.
What should I do if I hear unusual noises from my plumbing?
Banging, rattling, whistling, dripping, or gurgling sounds can develop because of pressure changes, loose pipes, drainage concerns, or worn plumbing components. While occasional sounds may not indicate a significant problem, we recommend having persistent or newly developing noises evaluated. As a plumber in Jersey City, NJ, we can investigate where the sound originates and determine whether repairs or adjustments are appropriate. We also recommend noting when the noise occurs, such as after flushing a toilet or turning off a faucet, because those details can help us identify the potential cause.
How can plumbing maintenance help prevent unexpected problems?
We use routine plumbing maintenance as an opportunity to identify developing concerns before they cause noticeable disruptions. Depending on your property, we may check accessible connections, valves, visible piping, fixtures, drainage performance, and other components for signs of wear or leakage. Preventive attention can be particularly valuable in older buildings where different parts of the plumbing system may have been installed or replaced at different times.
What plumbing concerns should I check before buying a property?
Before buying a property, we recommend paying attention to water pressure, visible leaks, staining, fixture operation, pipe condition, drainage performance, and the apparent age of plumbing components. Older buildings may have undergone several plumbing modifications, so current appearances do not always reveal the condition of concealed systems. We can perform a professional plumbing evaluation to provide additional information before a purchase is finalized. Reviewing previous repairs, replacements, and recurring issues can also help you better understand potential maintenance needs and prepare for plumbing improvements after taking ownership.









