Aggressive behaviour towards security staff on Wellington's Paremata Bridge has put an end on safety patrols in the area

Since 2015, Greater Wellington Regional Council has funded patrols over the swimming season to manage safety of swimmers and boaties.

A guard last year prevented a drowning.

Greater Wellington Harbourmaster Grant Nalder says they believe the patrols have had a positive impact.

But he says they're not prepared to expose security staff to aggressive behaviour, insults, intimidation and wilful disregard of their advice.