Wentzville Citywide Boil Water Advisory Activated as New 30-Inch Main Connects

A citywide precautionary boil water advisory is currently in effect for all water customers in Wentzville. The order was activated on Monday ahead of the previously scheduled time to protect residents while utility workers finalize a new water main connection.

The change stems from a major infrastructure project by Public Water Supply District No. 2 of St. Charles County. This district supplies approximately 4 million gallons of water to Wentzville daily. During peak summer months, that volume can rise to between 8 and 9 million gallons per day.

Jim Wright, the executive director of the district, stated that Wentzville accounts for roughly 25 percent of the district's total usage. Wright noted that system pressures in the city can drop during those high-demand periods, which residents may notice as reduced water flow. To address this, the district installed an additional 30-inch transmission main running from its main water tower to the city's connection point on Prospect Road.

Devon Dezort, the director of utilities for Wentzville, explained that the city’s water usage is increasing as the population grows. The new 30-inch line will work alongside an existing 30-inch line to improve resilience, increase flows, and maintain higher pressures. Dezort said this upgrade will allow the system to function more effectively during the hottest months of the year.

Workers had to shut off water on Monday to perform the necessary tie-in work. This process required dropping the pressure in the existing piping infrastructure to allow contractors to connect the new transmission main to the meters that feed the city. Once the physical connection is complete, the system must be flushed and undergo water quality testing to confirm the water is safe for drinking.

The city issued its alert at 6 p.m. on Monday, noting that the advisory began earlier than announced as a precaution. Test results require a minimum of 18 hours to process. The city expects to lift the advisory in approximately 48 hours, pending the receipt of those results. Residents will be notified through official channels once the order is rescinded.

Until then, the Missouri Department of Natural Resources recommends that residents use bottled water or tap water brought to a full rolling boil for three minutes before cooling. This applies to drinking, cooking, brushing teeth, making ice, and watering pets. Household water filters do not replace the boiling requirement. The city is also asking residents to conserve water for non-essential uses like lawns and laundry while the advisory remains in place.