Backflow Prevention (Cross-Connection Control): Nashville restaurant guide

Metro Water Services — Cross Connections Program

What it is

Restaurants are 'high-hazard' customers that need an approved backflow prevention assembly on the water service. MWS inspects and tests it every 12 months.

When a restaurant needs it

All restaurants; checked during the MWS sign-off on your permit or U&O.

How to apply

Your plumber installs a USC-approved assembly directly behind the meter. Indoor installs need an MWS variance. Coordinate through the MWS Cross Connect review on your Codes permit.

Documents you’ll need

Device make/model (USC-approved list)
Installation location (variance request if indoors)

Fee

$50 per device for the annual MWS inspection/test (business hours); $42 per retest

Processing time

Varies

Renewal

Tested every 12 months by MWS

Who files

Installed by a licensed plumber; MWS performs the annual test.

Good to know

Indoor installations need 7 ft head clearance, 3 ft front clearance and proper lighting.

Official source

Metro Water — Cross Connections Program

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Last reviewed 2026-10-06. Guidance only, not legal advice.