The Backflow Files: The Day the Soda Tasted Like the Sea

Welcome to The Backflow Files, a Certified Backflow Testing series where we look at real water contamination incidents, cross-connection failures, and drinking water close calls from around the country. These stories are not shared to scare property owners. They are shared to make backflow prevention easier to understand — because annual testing, proper repair, correct installation, and report submission all exist for a reason.

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Some backflow stories start with a failed annual test. Some start with a leaking assembly. And some start with customers sending back their drinks because the soda tastes salty.

This case takes us to Norfolk, Virginia, January 1981, when a nationally known fast food restaurant contacted the local Water Department with an unusual complaint: customers were rejecting soda fountain drinks, coffee, and even orange juice because everything tasted like saltwater.

Water officials checked nearby customers and found another salty-water complaint at a nearby waterfront ship-repair facility. The restaurant and the shipyard were both served from the same water-main lateral, which led investigators straight to the real source of the problem: seawater had backflowed into the public water distribution system.

What Went Wrong?

Once officials inspected the shipyard, the chain of failure became clear.

First, the backflow preventer on the shipyard service line had frozen and burst earlier that winter. Instead of replacing it immediately, it had been removed and replaced with a sleeve, which restored water service but removed the protection against backflow entirely.

Second, the shipyard’s fire protection system used high-pressure seawater, maintained by electric and diesel pumps. Those pumps were primed using a city water line that was directly connected to the high-pressure fire system. With that priming line left open, the seawater system had a direct path back toward the potable water system.

In plain English: a failed backflow preventer was taken out of service, a direct cross-connection remained open, and a high-pressure seawater system pushed raw saltwater backward into the public water supply.

That is backpressure with a very memorable result.

How Was It Fixed?

The fix was straightforward, but the lesson was expensive. Officials removed the city-water priming line from the fire pumps and installed a new backflow preventer at the shipyard service connection in place of the sleeve. To help prevent another winter failure, heat tape was wrapped around the new backflow preventer to reduce the chance of freeze damage in the future.

The immediate problem was solved. The bigger takeaway lasted much longer.

The Backflow Lesson

This Norfolk case is a perfect reminder that backflow prevention is not just a technical requirement or another form to file. It is the barrier between a safe public water supply and whatever is on the other side of a cross-connection. In this case, the “other side” was a high-pressure seawater fire protection system.

For homeowners, businesses, HOAs, municipalities, shipyards, industrial facilities, and property managers, the lesson is simple:

• A failed or removed backflow preventer should never be treated as a minor issue

• Temporary workarounds can create major contamination risks

• Cross-connections involving pumps, fire systems, irrigation, chemicals, or non-potable water need proper protection

• Freeze protection matters, because cold weather can damage assemblies and quietly eliminate the protection they are supposed to provide

• Annual testing, proper repair, and prompt replacement all play a role in keeping drinking water safe

Why This Still Matters Today

Most backflow incidents do not start with a dramatic explosion or a visible plumbing failure. They start quietly: a frozen assembly, an overlooked repair, an open connection, a system modified for convenience, or a device that was never put back the right way.

That is why backflow testing, repair, installation, retesting, and report submission matter. A backflow assembly is not there for decoration. It is there to stop the exact kind of reverse flow that turned a Norfolk soda fountain into a saltwater dispenser.

Certified Backflow Testing helps property owners stay ahead of that risk. We provide backflow testing, backflow repair, backflow installation, retesting, and report submission for residential, commercial, HOA, municipal, and property management customers throughout Washington and Northern Idaho.

If you received a notice, had a failed test, need a repair, or want help understanding what is required, call 425-427-8889.