  We present a method for certifying the existence of an arbitrary Maass cusp
form for any level and character. This is accomplished by producing a bound on
the difference between the $\Delta$-eigenvalue of an authentic Maass cusp form
and a purported approximation of a $\Delta$-eigenvalue, arrived at by any
means. We apply this method to a proposed non-CM level 5 form with quadratic
character, to present the first certified $\Delta$-eigenvalue of such a form.
This work generalises the method for certifying level 1 forms presented by
Booker, Str\"ombergsson and Venkatesh, and is motivated by the production of
purported Maass cusp forms of arbitrary level and character via methods
developed by Hejhal and Str\"omberg.
