Cedar City has lifted a boil water order for residents and businesses in the South Pressure Zone after multiple rounds of testing yielded negative results for E. coli and total coliform bacteria. The lifting of the order follows a contamination alert triggered on October 20, 2026, when a water sample from an outside hose bib tested positive for E. coli.
Testing and Remediation Efforts
The Cedar City Waterworks announced the resolution of the drinking water concern after conducting extensive testing to ensure public safety. Following the initial notification from the Southwest Utah Public Health Department Laboratory, city officials implemented corrective actions, including increased chlorination and flushing of the affected street where the positive sample was identified.
Sequence of Water Sampling
The city conducted several rounds of sampling to confirm the water was safe for consumption. On October 21, 2026, four repeat samples were taken at the source of the Quichpa well, as well as one upstream, one downstream, and one at the original positive source. While the samples at the Quichpa well and surrounding areas returned negative for E. coli, the sample at the original source tested positive for total coliform.
Validation of Water Safety
A second round of testing occurred on October 22, 2026, with four samples taken at the Quichpa well source, one downstream, and one at the affected positive source. All four of those samples returned negative for both total coliform and E. coli. On October 23, 2026, an additional fourteen samples were collected, including four at the previous repeat locations and ten others within the affected area. All fourteen of those samples also returned negative for both types of bacteria.
Potential Causes of Contamination
City officials suggested the initial positive result may have been linked to localized contamination near the sampling site. According to Cedar City Waterworks, a homeowner's chickens had reportedly escaped their enclosure and were moving around the sampling area before the original sample was collected. Additionally, officials noted that contamination in the air from immediate surroundings could potentially enter a sample bottle during the brief period when the bottle is being opened and closed.
Investigation and Future Assessments
The contamination may have also been related to the handling of the water by personnel or during transfers by the testing lab. While the specific cause remains under investigation, the city noted that bacterial contamination can occur through various means, such as breaks in the distribution system, failures in the water treatment process, or cross-connection contamination from illegal secondary water hookups. To address these risks, the city is working with the Division of Drinking Water to complete a Level 2 Assessment in the coming weeks.
Public Health Guidance
During the period the order was in effect, residents in the blue-shaded area—extending from 200 S. to Cedar Knolls—were instructed to bring all water to a boil for one minute before use or to use bottled water for drinking, making ice, brushing teeth, washing dishes, and food preparation. The city emphasized that E. coli presence indicates the potential for human or animal waste contamination, which can cause symptoms such as diarrhea, cramps, nausea, headaches, and other illnesses.
Ongoing Monitoring Efforts
The lifting of the order marks the end of a period of heightened monitoring for the South Pressure Zone. While the immediate threat has been resolved, the city continues to monitor the system and has increased sampling for coliform bacteria to ensure ongoing safety.
