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Learn how covalen helped improve the quality of life at this large lake community by replacing failing septic systems with a low pressure sewer solution.

Twin Lakes Regional Sewer District

Lake Freeman, 1,547 acres with 50 miles of shoreline

Lake Shaffer, 1,291 acres with 50 miles of shoreline

White County – Monticello, IN


Lake Freeman and Lake Shaffer are reservoirs on the Tippecanoe River, with housing and recreational developments along the shorelines. In the mid-1990’s, the two lakes were suffering from poor water quality due to failing septic systems and inadequate soil conditions. The poor water quality was threatening the area’s quality of life, safety, and economy. To combat the problem, the Twin Lakes Regional Sewer District’s Advisory Committee began seeking alternatives that provided optimal public health and safety, and that were cost-effective.


After investigating numerous ways to provide sewer services to the large area around the lakes, the Advisory Committee decided that low pressure sewer systems and multiple wastewater treatment plants provided the best and most cost-effective solution to resolve the water quality issues. The septic systems along the lakes’ shoreline were eliminated. covalen provided much of the infrastructure required to implement to solution. The combination of E-One grinder pumps and directional boring enabled the project to be completed at an attractive budget. Directional boring traversed the lakes eight times and the Tippecanoe River three times. Using a staged implementation approach, eight service areas were defined and implementation began in 2000. Presently, 7,000 locations are served by 4,280 grinder pumps. When completed in 2012, the project will be the largest low pressure sewer system in North America.


  • 4,280 E-One grinder pumps
  • 180+ miles of directionally drilled HDPE pipe
  • 2 sewage booster packages
  • 5 Gorman-Rupp self priming lift stations
  • 4 wastewater treatment plants


  • 7,000 locations
  • 4,280 grinder pumps
  • 180+ miles of directional boring
  • 4 wastewater treatment plants
  • Largest low pressure sewer system in North America