On 3 March 2016, he was at centre-back when CIT defeated Dublin City University by 1–13 to 0–13 to win the All-Ireland Division 1 Freshers final.
He made his first appearance for the Waterford minor hurling team on 9 April when he lined out at right wing-back in a 1–13 to 0–11 defeat of Clare.
Prunty's football season ended on 29 April with a defeat by Clare, however, he enjoyed an extended run with the minor hurling team.
[10] Prunty enjoyed a more successful debut with the under-21 hurling team on 13 July when he lined out at left wing-back in a 3–23 to 1–11 defeat of Clare.
[11] He retained his position on the starting fifteen for the Munster final against Tipperary on 27 July and collected a winners' medal following the 2–19 to 0–15 victory.
[16] Prunty remained as a member of the extended panel for the rest of the season which culminated on 3 September with a 0–16 to 2–17 defeat by Galway in the All-Ireland final.
[17] On 11 March 2018, Prunty made his first appearance in the National League when he came on as a 54th-minute substitute for Mark O'Brien in a 1–23 to 1–20 defeat of Clare.
On 31 March 2019, Prunty was introduced as a substitute for Calum Lyons at full-back when Waterford suffered a 1–24 to 0–19 defeat by Limerick in the National League final.