About Wastewater Treatment

Users of the sewer system may not be aware that the wastewater treatment plant is not designed to remove pollutants that cannot be removed by gravity settling or which are not biodegradable over a short period of time.

What is flushable? Find out which items should go in the trash to help protect our sewer system. 

Damaging Substances

Substances may damage the treatment processes or pass through the treatment plant and into the Connecticut River, these substances include:

  • Household Chemicals
  • Paints
  • Pharmaceuticals
  • Solvents

Sometimes these chemicals can cause a danger to the staff members that operate and maintain your wastewater system.

Preventive Action

To avoid causing a problem, substances such as these should be kept out of the sewer system and be disposed of properly. The periodic hazardous waste collection events held at the City’s Landfill are a perfect opportunity for proper disposal.

If you are uncertain if something is safe for disposal to the sewer, the staff at the Wastewater Plant would be happy to discuss this.


Anyone interested in learning about the Wastewater Treatment Plant can request a tour of the facility by calling 603-298-5986. 

Tours take between 30 minutes and 1 hour and will teach you the important role the City’s Wastewater Facilities play in the protection of our environment.