Additionally, for those concerned more with operations than certification, Part 121 provides explicit relief from wet runway considerations for aircraft certified to older standards ....
Sec. 121.189 Airplanes: Turbine engine powered: Takeoff limitations.
(a) (WAT limited weight).
(b) (takeoff distance (one version))
(c) (takeoff distance, second version)
(d) (flight path/obstacle clearance)
(e) In determining maximum weights, minimum distances, and flight paths under paragraphs (a) through (d) of this section, correction must be made for the runway to be used, the elevation of the airport, the effective runway gradient, the ambient temperature and wind component at the time of takeoff, and, if operating limitations exist for the minimum distances required for takeoff from wet runways, the runway surface condition (dry or wet). Wet runway distances associated with grooved or porous friction course runways, if provided in the Airplane Flight Manual, may be used only for runways that are grooved or treated with a porous friction course (PFC) overlay, and that the operator determines are designed, constructed, and maintained in a manner acceptable to the Administrator.
So if you aren't a 25-92 or later aircraft, there's no Part121 wet requirements.