A general description of a wastewater land treatment system located in a 'cold temperate' climatic region is given. The winter season average daily design flow is almost double that of the summer-fall season (0.55 MGD vs 0.30 MGD). Wastewater is sprayed on a forested knoll after it receives secondary biological treatment. The system is operated during the winter when the ambient air temperature is as low as 10 F ( -12.2 C). Spray nozzles have been developed that ensure rapid drainage of the spray laterals after each spray cycle and, therefore, prevent their freezing. (Author).