Ever wonder where it goes? Down the toilet or down the drain isn’t the end of the line. When you flush the water and unmentionables they go somewhere.

Most homes, businesses, and industries in Mills are connected to a sewer system that conveys flushed and drained wastewater to the Casper wastewater treatment plant prior to being released cleanly and safely into the environment.

Some things should never be flushed or sent down the drain because they cause problems.
Do not use your toilet as a trash can!

Sewer Blockage

The most common cause of sewer plugging is caused by FOG (Fats, Oils and Grease). Grease and oil comes from meat fats, lard, oil, shortening, butter, margarine, food scraps, baked goods, sauces, and dairy products. If they are sent down the drain they stick to the surface of drain piping and sewer lines. They eventually build up to the point of full plugging and then raw sewage can backup into your home or overflow into the street. You can help prevent this unpleasant situation by following these simple rules:

  • Never pour grease down a drain or into a toilet!
  • Put baskets/strainers in sink drains to catch food scraps and other solids then empty them into the trash can.
  • Scrape grease and food scraps into a trash can and avoid sending them down the drain or food disposal.
  • Restaurants should all have approved and maintained grease traps.
  • Disposal units do not keep grease out of sewers!
  • Hot water and detergents that dissolve grease do not prevent the problem; they only move the problem down the system.


Please download our Residential Handbook for more information and policies.