TM Systems & Services Current Activities Featured Articles St. Paul Weather Contact Us About Us District Energy owns the largest hot water district heating system in North America in addition to a large chilled water cooling system. This non-profit, community-based corporation keeps prices low and stable because it is fuel flexible -- it can use natural gas, oil, clean-burning coal, or wood, ...

Healy-Ruff Corporation Inc - Over 70 Years of Water & Wastewater Control ...

Vortex Flow Inc. is dedicated to innovating products that protect the public and environment from wastewater odor, and stop the corrosion of interceptor systems. We are the inventors of the acclaimed Vortex Drop Structure and the new Vortex Insert Assembly (U.S. patent pending). Winner of the 1999 American Public Works Association Technical Innovation Award, the Vortex Drop method utilizes the ...