**CHEYENNE, Wyo.** – The Cheyenne Board of Public Utilities (BOPU) issued a mandatory boil water advisory late Monday evening for several residential and commercial districts following the detection of *E. coli* and total coliform bacteria during routine water quality sampling.
The advisory, which officials describe as a precautionary but necessary measure, has sent shockwaves through Wyoming’s capital city, affecting thousands of households, local schools, and the downtown hospitality sector.
### Scope of the Contamination
The bacteria were discovered during a scheduled round of testing at multiple points within the city’s distribution network. While the city’s primary water treatment facility continues to report clear exit samples, the presence of bacteria in the distribution lines suggests a potential breach in the system, possibly caused by a recent drop in water pressure or aging infrastructure.
The affected areas primarily include the northern and eastern corridors of the city. Residents living between Dell Range Boulevard and the northern city limits are being urged to exercise extreme caution.
### Health Risks and Safety Protocols
Public health officials warn that *E. coli* can cause a variety of symptoms, including severe stomach cramps, diarrhea, and vomiting. While most healthy adults recover within a week, the bacteria pose a significant risk to infants, the elderly, and those with compromised immune systems.
"We are working around the clock to isolate the source of the contamination," said Mary Marshall, a spokesperson for the BOPU. "Until we can provide two consecutive rounds of clean test results, we are asking every resident in the affected zones to treat their tap water as if it were contaminated."
Under the current advisory, residents are instructed to bring all water to a rolling boil for at least one full minute before using it for drinking, making ice, brushing teeth, washing dishes, or food preparation. Officials also recommend discarding any ice cubes made with tap water within the last 48 hours.
### Impact on the Community
The timing of the advisory has created significant logistical hurdles for local businesses. Several restaurants in the Dell Range area opted to close their doors Tuesday morning, citing an inability to meet health department standards for food safety. Local grocery stores reported a surge in demand, with many shelves stripped of bottled water by mid-morning.
Cheyenne Regional Medical Center has transitioned to its emergency water protocols, utilizing stored reserves and bottled supplies to ensure patient safety and continue surgical procedures without interruption.
### The Path Forward
The Cheyenne Board of Public Utilities has begun a process known as "flushing" the system, which involves forcing high volumes of chlorinated water through the pipes to eliminate any residual bacteria.
"Our crews are currently scouring the grid for any signs of a pipe burst or a cross-connection that could have introduced the bacteria," Marshall added.
The advisory is expected to remain in place for at least 48 to 72 hours. According to federal EPA regulations, the city must produce two sets of samples, taken 24 hours apart, that show no presence of coliform bacteria before the "all clear" can be given.
City officials are providing regular updates through the Cheyenne BOPU website and local emergency alert systems. Residents are encouraged to sign up for text notifications to receive the latest information on the status of the water supply.
In the interim, the city has established three potable water distribution stations at local community centers to assist residents who do not have access to bottled water.
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