WICHITA, Kan. — About 500,000 water customers in Wichita and nearby communities are under a boil water advisory after an early-morning power failure at the city’s water treatment system caused widespread pressure loss on Wednesday, September 16, 2026.
The disruption began after Wichita’s current water treatment plant, which had switched to backup generators during overnight storms, also lost backup power at around 5 a.m. The Hess Pump Station was affected as well, leaving the system temporarily unable to maintain normal water pressure.
Power has been restored and pressure is recovering, but the advisory remains in place while officials test water from across the system. Residents should continue following boil-water precautions until the Kansas Department of Health and Environment, or KDHE, formally rescinds the order.
BREAKING: A boil water advisory has been issued for all City of Wichita water users following this morning's citywide loss of pressure. https://t.co/M6QObTVqyS #KAKEnews
— KAKE News (@KAKEnews) September 16, 2026
Power failure disrupted Wichita’s water system
Wichita Public Works Director Gary Janzen said the plant moved to backup power during Tuesday night’s storms. Officials were still working to determine why that backup supply later failed.
The outage also affected the Hess Pump Station. City officials said parts of the distribution network may have dropped to zero pressure before pumping capacity was restored.
The immediate problem identified by officials was the loss of electrical and backup power. They have not said the water-treatment process itself failed.
Which communities are affected?
The advisory extends beyond Wichita because several surrounding communities receive water through the city’s system.
Local reports identified Andover, Derby, Kechi, Park City, Bel Aire, Valley Center, Rose Hill and McConnell Air Force Base among the affected areas.
The disruption affects homes as well as schools, restaurants, workplaces and other facilities that rely on safe tap water for drinking, cooking, ice and cleaning.
Boil-water notices can create similar day-to-day challenges in other communities. Earlier in 2026, a Christchurch boil water alert also required residents to change how they used tap water for drinking and food preparation.
Why a pressure loss leads to a boil water advisory
A boil-water advisory does not mean contamination has been confirmed. The concern is that a major pressure loss can create conditions that allow contaminants to enter the distribution system or reduce protective chlorine levels.
That is why testing continues even after water pressure returns.
Wichita crews were deployed to collect samples from 195 testing stations across the community. Those samples are being checked for bacteria and chlorine levels before officials determine whether normal water use can resume.
Initial laboratory results may take about 24 hours after samples are collected. That period is a testing timeframe, not a guaranteed end time for the advisory.
Residents should boil water for drinking and cooking
Customers should boil tap water for at least one minute before drinking it or using it for food preparation. Bottled water can be used instead.
Existing ice cubes should be discarded, and household automatic ice makers should not be used while the advisory is active.
If tap water looks dirty or discolored, residents should let it run until it becomes clear.
For dishes and other food-contact surfaces, official guidance recommends immersing them for at least one minute in clean tap water containing one teaspoon of unscented household bleach per gallon of water.
Water used for bathing generally does not need to be boiled, although children should be supervised so they do not swallow it. People with cuts or severe rashes may wish to consult a physician.
The City of Wichita’s official public water guidance provides the latest safety instructions and confirms that only KDHE can issue the rescind order after certified laboratory testing.
Schools and restaurants face disruption
Wichita Public Schools canceled Wednesday classes for elementary schools with 9 a.m. start times. Families with children already attending latchkey programs at those schools were asked to arrange pickup as soon as possible.
Schools already in session and secondary schools with 9 a.m. starts continued operating. The district said decisions affecting September 17 and after-school activities would depend on updated information.
Restaurants and other food establishments also need additional precautions because tap water may be used in drinks, food preparation, ice production and cleaning. Businesses with questions can contact the Kansas Department of Agriculture Food Safety and Lodging program at 785-564-6767.
Large water-system failures can quickly affect wider community services. A previous major water supply disruption in Kent and Sussex also affected homes, schools, businesses and essential services when pressure and supply problems spread across the network.
Wichita is preparing for a new treatment plant
The incident comes as Wichita prepares for a major transition in its water infrastructure. The treatment plant currently serving customers is more than 80 years old, while the city is moving toward full operation of a new facility.
The new plant is expected to become fully operational in the second quarter of 2027. Officials have not linked the age of the existing facility to Wednesday’s power outage, so the two issues should not be treated as proven cause and effect.
Normal pressure does not mean the advisory is over
Residents may see normal water pressure before testing is complete, but that does not mean the advisory has ended.
Only KDHE can officially lift the order after certified laboratory results show the system meets the required conditions. Until then, customers across Wichita and the affected surrounding communities should continue boiling water used for drinking and food preparation.
Residents with questions can contact the City of Wichita at 316-265-1300 or KDHE at 785-296-5514 while officials continue sampling and provide further updates.
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