Wichita’s September 2026 Boil-Water Advisory Started With Backup-Power Failure

Wichita’s September 16, 2026 boil-water advisory followed a backup-power failure that shut down pumps and reduced water-system pressure. The city’s subsequent review identified a generator-control setting that called for additional generation too late as pump demand increased. A separate electrical switchgear issue remained under investigation in that review. This was not simply a utility outage or a confirmed mechanical pump failure. (City’s September 22 review)

The advisory for Wichita itself ended September 17 after all 195 water samples tested clear. Advisories for neighboring systems supplied by Wichita were lifted separately, with the last ending September 20. Those are the dates for this incident—not a notice of a current advisory. (City recap, KWCH’s successive updates)

Why the station was running on generators

Storms on September 15 caused a brief power interruption around 7 p.m. With further storms approaching, staff decided at 8:22 p.m. to move the Hess pump station to backup generation in manual-switch mode.

According to the city, this longstanding practice allowed a planned transfer without the interruption and equipment resets associated with an automatic transfer after utility power failed. The intention was to protect continuity of pumping—not to operate without a backup. (September 22 review)

Manual operation also mattered when generator power failed. Public Works and Utilities Director Gary Janzen told KMUW on September 16 that the system was not set up to return automatically to primary power in that situation, although primary power was believed to be available. The later city review clarified that generators normally operated in automatic-transfer mode, but could be placed in manual mode during storms. (KMUW report, city review)

What failed in the pump-and-power sequence

The city’s preliminary timeline recorded two generators and two pumps operating before the first failure at 5:03 a.m. Both pumps shut down. During recovery, an attempt to start a third pump at 5:13 a.m. overloaded the two generators, which went down. (Preliminary event timeline, updated September 21)

Testing on September 18 identified the control problem: demand exceeded the capacity of the two operating generators before another generator had enough time to start. The load threshold used to call for additional generation—the “start set point”—was believed to be too high. The city lowered it so additional generation would start sooner. All four generators underwent off-load and full-load testing. (City review)

That distinction is important for pump-system maintenance. Installed generating capacity is not the same as capacity available at the instant another pump starts. Here, the city identified a sequencing problem between pump demand and generator availability, not merely an insufficient count of generators.

The review also identified a separate issue with City Substation No. 2 switchgear. It worked successfully when retested, but the event-related failure was still being assessed as of September 22. The programming finding therefore should not be presented as a complete explanation of every interruption that morning. (City review)

Why restored pressure did not end the advisory

The city reported pressure falling from 90 psi to 40 psi within four minutes of the initial pump shutdown at Hess. Utility power was restored around 5:45 a.m.; pumps and supporting equipment were restarted by 6:03 a.m. (City review)

Restoring pumping resolved the immediate supply problem, but not the water-quality uncertainty. As KMUW reported, KDHE warns that inadequate pressure can lead to loss of chlorine residuals and bacterial contamination. The advisory was precautionary: it did not establish that contaminated water had been found. (KMUW)

Samples required a 24-hour incubation period. After all 195 results came back clear and the conditions creating contamination risk were resolved, KDHE rescinded Wichita’s advisory on September 17. Wholesale customers needed clearance for their own distribution systems rather than assuming Wichita’s notice covered them. (City recap)

What Wichita changed

By September 22, the city had adjusted generator programming and retested the equipment. It also paused its practice of switching to generators ahead of weather events and planned additional staffing during those events. Automatic return to normal operation after generator failure in manual mode remained under evaluation. (City review)

In a September 25 community letter, City Manager Dennis Marstall said the setting and technology glitch had been reprogrammed and fixed, while assessments of the electrical and backup systems and weather-event procedures continued. (City manager’s letter)

The pump-system lesson is specific: backup power must deliver capacity in the right sequence, and the recovery path must work when that sequence fails. Getting the pumps running again and establishing that distributed water is safe are separate tasks.