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Backflow preventers keep the public water supply safe from contamination due to backflow. Contaminants like sediment, bacteria, chemicals, and fertilizer are a major public health hazard and must be prevented from entering the potable water supply. Contamination usually happens when the pressure of the public water system is less than the pressure at a customer’s location, often because of water main breaks or elevation differentials.

Mueller Steam Specialty™ Simplex Basket Strainer, Series: 125, 3 in Nominal, 11-1/4 in Overall Length, Screw Connection, Cast Iron, B Grade, Domestic

Metro Nashville requires that backflow preventers (with their meters) be installed for large residences and most commercial projects. Pools, irrigation, and sprinkler systems require backflow preventers. All backflow preventers must pass inspection for you to receive a Use and Occupancy (U and O) permit for your facility.

Registered contractors and members of the public can track the progress of applications, inspections, and permit issuances by address or by using the permit application number that is created by the Codes zoning examiners at the start of the process at epermits.nashville.gov.

This 3 in cast iron threaded basket strainer is used to separate large volumes of particulate so as to protect other equipment downstream. The basket is 0.062 perforated.

Mueller Steam Specialty™ M6702198 125 Simplex Basket Strainer, 3 in Nominal, 11-1/4 in OAL, Screw Connection, Cast Iron, Domestic

Water service connections requiring backflow compliance must have the correct type of backflow preventer installed in a location directly behind and as near to the water meter as possible. Due to the potential for future connections to the water service line and the risks of a catastrophic failure causing flooding conditions, backflow assemblies are to be installed outside.

This description is intended to provide a general process overview and does not cover every situation. Each applicant’s situation depends on the particulars of the work to be done and the location of the property.

Metro Nashville requires that backflow preventers (with their meters) be installed on equipment like pools, irrigation systems, and sprinkler systems. They are also required for large residences and most commercial projects.

For general questions about Metro services, dial 311 or 615-862-5000 to speak with a representative at hubNashville or visit hub.nashville.gov. A representative there will answer your question or put you in contact with someone who can.