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Grand Prairie describes firefighting‑foam backflow that triggered a do‑not‑use order
Summary
City of Grand Prairie officials outlined a Sept. 3 firefighting‑foam backflow event that entered the drinking‑water system through a fire department connection, prompted a do‑not‑use advisory for a pressure plane serving roughly 60,000 people, required millions of gallons of flushing and bottled‑water distribution, and led to pending lawsuits.
Cindy Mendez, director of public health and environmental quality for the City of Grand Prairie, described a Sept. 3, 2024 incident in which firefighting foam entered the city’s drinking‑water distribution system via a fire department connection (FDC) placed upstream of a backflow preventer.
Mendez said the event began after a small industrial warehouse fire in the Great Southwest Industrial Area. When a fire engine activated a foam pump and connected to the facility FDC, foam backflowed into the distribution system; the FDC connection point was upstream of a backflow preventer and a single check valve in the street (installed decades…
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