People ask... "What's with the name?  Why Celtic Outdoor?"

" I am the last of my line of O'Neill men. Before me, came coal miners and school teachers, bartenders and baseball players.  My grandfather was one of baseball's famous O'Neill Brothers. He and three siblings represented the only time that four brothers have ever played at the same time in baseball's Major League . 

By "tipping my hat" and calling the company Celtic Outdoor, LLC, I chose to honor those folks that sacrificed everything to come to America in the late 1800s, so that I might have all the opportunities I enjoy today. I come from a long line of hard working, rowdy, and loyal people. I think they'd like the name." -Clark O'Neill 

The forgotten Galway brothers who once ruled baseball - A Tribe Called West

A Baseball Almanac exclusive written by baseball historian Chris Williams

Steve O'Neill  written by Adam Ulrey

His efforts to promote water saving initiatives, intelligent water use and dedication to the NC Landscape Industry have made him a respected resource and an Industry veteran.

NC Plumbing Licensing Board

Call today to discuss your landscape irrigation and lighting  needs!   704-595-7557

Copyright © Celtic Outdoor, LLC.  All rights reserved.

Clark was raised in Bucks County in Eastern Pennsylvania, just three miles north of where George Washington crossed the Delaware River. He came to North Carolina to attend Belmont Abbey College. There he met his wife Susan, and the two live just outside Charlotte, NC. They share a small farm with pair of horses, a miniature pony, several chickens and an extremely spoiled Irish Setter. 

About Us

Irrigation System Specialists

NC Irrigation Contractors License for Clark C. O'Neill #184

NC Irrigation Contractors License for Celtic Outdoor, LLC #C-785

NC State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractor License  #32819

NC Landscape Contractor License #3071

A passionate motorsports fan, Clark actually has spent many Sundays traveling the country
as part of a NASCAR pit crew.
His other interests include live music, hiking, boating, and a disturbing addiction to British sports cars, such as  Triumphs and MGs.


Celtic Outdoor, LLC is owned and operated by Clark O'Neill. He has been involved in the landscape and irrigation industry in North Carolina for nearly 30 years. During that time he has developed a reputation as an industry leader and an award-winning proponent of using minimal water in the landscape.

Clark was honored to have been recognized by both the Carolinas Irrigation Association with the Dr. Ronald Sneed "Friend of the Industry" Award and Toro's Water Smart Partner Award.