Cross Connection Program / Backflow Testing

Cross-connections between water supplies and non-potable sources of contamination represent one of the most significant threats to health in the water supply industry.

Backflow is the reversal of water from its intended direction due to a pressure differential. It can occur anywhere that has a potential cross-connection in a water system, including dishwashers, garbage disposals, toilets, shower heads, faucets, pools, lawn irrigation systems, fountains, and hoses.

Backflow Device

The Cross Connection Program is designed to maintain the standards of water potability of the City’s distribution system by establishing rules and procedures to control potential cross-connections and to prevent the contamination of public drinking water from other liquids, materials, and sources other than its intended source by installing approved backflow devices.

Rundlett Backflows

Installing parallel backflow devices can allow for required tests to be performed without interrupting water service.

For more Information: Cross Connection Control Program Brochure (PDF)

Residential Irrigation Backflow Tests

In accordance with NHDES Env-Ws 364, Backflow Prevention, the City will begin conducting annual residential irrigation backflow tests starting in July 2025 as a continued effort to protect the City's water supply and distribution system from potential contamination. Learn more by visiting our Irrigation Webpage.