The coastal town won the 2015 cleanest beaches awards and the prize for environmental education.
Judges praised the Guilderton community�s appreciation of their environment and active work to maintain it.
Northern Agricultural and Moore Catchment councils hold regular environmental educational days and workshops, with the endangered Carnaby�s black cockatoos being a favourite.
�The most exceptional element of environmental education that occurs in Guilderton is embodied in the community�s ongoing efforts to preserve the environmental values of the beach and estuary system,� Australian Clean Beaches judge Averil Bones said.
The winners were announced in Darwin on August 14. Guilderton Community Association president Gillian Lamont, vice-president Linda Johnson and long-time Guilderton resident and former president John Prince (92) travelled to Darwin for the event.
�We are completely overjoyed at the outcome,� Ms Lamont said.
�The standard was so high we didn�t think we stood a chance.�
Environment Minister Albert Jacob said the national title was well-deserved recognition for the small coastal town.
�Guilderton is at the mouth of the Moore River and is renowned for its sparkling, clear water and coastline,� he said.
�But it does not just happen to be this way � there is a great deal of community effort supporting this beautiful environment.
�The town of 150 people attracts large numbers of visitors during the holiday season and with this influx comes significant litter and environmental pressures.
�Guilderton is very proactive in protecting its beautiful coastline, removing litter and educating people on marine and wildlife ecosystems.�