Kāpiti Coast Airport is investigating who is hitting golf balls on to the runway and surrounding land.
The area also includes the Kapiti Districts Aero Club apron and in the carpark near the aero club hangar and clubrooms.
"The golf balls aren't coming from the golf course [Paraparaumu Beach Golf Club], they are coming from neighbours," airport chief executive Chris Simpson said.
"This issue is a serious safety concern, particularly with balls landing on the runway.
"They are a hazard that could cause a potentially life-threatening accident if a plane was to hit one on the runway as it lands or takes off.