The current facility was constructed in 1964, though many improvements have been made to meet more stringent effluent restrictions.  Current permitted capacity is 1.5 millions gallons per day. The plant operates at approximately 50 - 55 percent capacity during the peak summer season.  Wastewater passes through a series of basins that modify air levels and create environments to encourage desirable biological activities.  Recycling a portion of the flow continuously enables the process to repeat and achieve further reductions. Finally the effluent is "polished" with DAF filtration and UV disinfection before being discharged to the Big Thompson River.