TSD boundaries currently encompass an area of approximately 39 square miles in Placer and Nevada Counties. TSD operates and maintains approximately 400 miles of gravity pipelines containing 4,000 manholes, 17 miles of pressure pipeline, 13 main lift stations, and 31 smaller lift stations. The entire collection system is closely monitored 24 hours a day through computerized telemetry and flow metering system. The collection system primarily services residential customers. Small businesses and restaurants contribute only a small percent of TSD's total wastewater flow. TSD does not service any heavy industrial customers. At present, there are approximately 13,400 residential and 2,000 commercial accounts discharging into TSD's wastewater collection system.