The company has had a busy 2009, with a £1m investment in kit including a five colour Nexpress S2500 with dimensional ink from Kodak, and a four colour Ryobi 524GX from Apex.
George Eckford, director of the £1.8m company, said the certification caps off the year.
"As our company grows, we are dealing more and more with blue chip companies or local governments that require us to have ISO 14001 in place, just to enter the tendering process," he said.
"We took the view that along with this requirement, and our own desire to reduce our environmental impact locally and worldwide, we would become ISO 14001 accredited. This now gives us a benchmark and platform to work from."
Eckford added that following being certified with ISO 14001 in December 2009, the company has already been put onto several approved supplier list, which without the standard would not have happened.
The 21-staff company serves the educational, local government and car industry sectors.
X1 further boosted its environmental credentials when it became FSC certified in July last year.