I John Kostynick — Mineola, NY Plumbing

Business Overview

I John Kostynick in Mineola NY is a plumbing and heating contractor with more than 55 years of local service. The company offers 24/7 emergency plumbing repairs and handles both residential and commercial jobs. Licensed technicians respond to clogged drains, leaking pipes, sewer faults, and water heater problems across Nassau County and parts of Suffolk.

The team is experienced with older Long Island homes and newer builds. They install and repair plumbing systems, work on gas lines, and install standby generators for homes that need backup power during winter nor'easters or summer storms.

Key Services

Services are grouped for quick scanning. Appointments and emergency calls are available.

• Drain repair and sink repair, including clogged drains and slow-running fixtures
• Faucet installation and garbage disposal work for kitchens and baths
• Water heater installation and water heater repair, tank and tankless systems
• Plumbing inspection, repair, replacement, and new plumbing installation
• Sewer installation and sewer repair, pipe replacement, and main line work
• Gas line installation and certified Generac generator installations for backup power

Areas Served

The company serves a wide area on Long Island, including:

• North Hempstead, Garden City, Mineola, Westbury
• New Hyde Park, Williston Park, North Hills
• Carle Place, Searingtown, Old Westbury
• Muttontown, Manhasset Hills, Brookville, East Williston

Company History

Founded more than five decades ago, I John Kostynick began as a small plumbing and heating shop serving Mineola and nearby neighborhoods. Over the years the company added licensed technicians, expanded service lines, and became a certified Generac distributor. Growth came from steady word of mouth and repeat customers in Nassau and Suffolk counties.

The firm moved from quick fixes to larger commercial and municipal work while keeping a hands-on approach to residential repairs. It has adapted to modern code requirements and updated equipment without losing local knowledge about older Long Island plumbing systems.

Leadership

Led by John Kostynick, the company relies on long experience with local plumbing conditions. The leadership emphasizes licensed tradespeople, continuing training, and practical problem solving. Staff often attend code workshops and generator training to stay current with safety and installation standards.

Specialties & Highlights

• 55+ years of continuous local service and familiarity with Mineola homes
• 24/7 emergency response for urgent plumbing failures
• Certified Generac generator distributor and installer for backup power
• Licensed technicians for residential and commercial projects

Why Locals Choose I John Kostynick

People in Mineola NY hire I John Kostynick because the company has steady experience, clear pricing, and a record of repairs that last. Technicians know how Long Island winters and coastal weather affect pipes and heating. The business stays local, answers emergency calls, and handles everything from faucet installs to sewer line replacement.

Hours: Mon–Fri 8:00 AM to 4:30 PM. Emergency service available around the clock for urgent issues.