A failed patch on a sewer pipe near Pueblo's Confluence Park sent 4.25 million gallons of raw sewage gushing into the Arkansas River starting Wednesday, prompting Colorado health officials to warn that downstream bacteria levels are now “extremely high.” The spill has triggered a multi-county river recreation advisory just as farms in the Lower Arkansas River Valley head into peak melon harvest season, raising fresh questions about food safety, water testing timelines, and how long the contamination will linger.
Pueblo city officials discovered and stopped the spill just before noon Thursday, according to a news release cited by The Denver Post. The discharge originated at the city's wastewater treatment facility on Stockyard Road, just east of Interstate 25 and downstream from Confluence Park, according to SECO News. Pueblo Director of Wastewater Andra Ahrens said the failure began when a concrete patch installed years ago over a hole in a sanitary sewer line — a line that runs inside a larger stormwater pipe — slipped out of place, letting pump pressure force untreated sewage into the stormwater system and out into the river, per a statement posted to the City of Pueblo website.
How Far the Contamination Reaches
The Colorado Department of Public Health and Environment reported that downstream river samples showed extremely high bacteria levels, including E. coli, per its news release cited by the Post. People and animals are being told to avoid Arkansas River water stretching from Fountain Creek in Pueblo all the way through the John Martin Reservoir in Hasty. The affected stretch includes Blende, Avondale, Fowler, Manzanola, Rocky Ford, La Junta and Las Animas, the Post reports, while the city's advisory — running through Monday — separately lists Boone and Swink among the communities urged to avoid swimming, tubing, kayaking and fishing.
State and local officials say testing will continue over the coming days to track how the contamination is dissipating, and they do not yet know how long the river advisory will need to stay in place. They say the advisory will be lifted once river conditions return to normal. Pueblo County health officials began multi-point water quality testing the day after the spill was stopped, submitting results to state health officials to monitor bacterial concentration over time, according to the Colorado Department of Public Health and Environment.
Health Warnings for Anyone Near the River
Coloradans are being told to avoid all contact with river water downstream of the discharge point, including swimming, wading, tubing, kayaking, or any other activity that puts skin in the water. Children and pets should be kept away from the river entirely, and people should not drink the untreated water, use it to prepare food, or apply it to fruits and vegetables meant to be eaten raw. Pets and livestock should also be kept from drinking the affected water.
Anyone who does come into contact with the river should wash hands and skin immediately with soap and clean water, remove wet clothing and launder it separately from other items, and contact a health care provider if symptoms develop. E. coli exposure can cause diarrhea, vomiting, stomach cramps, fever, and other illnesses, according to the Post's reporting. Officials are also advising against fishing in the affected area for now.
Drinking Water and Farm Irrigation Under Scrutiny
State officials say there is no evidence so far that the spill has affected public drinking water systems, noting those systems were notified in time to shut off their intakes and have multiple protective steps built in. In La Junta specifically, municipal water officials confirmed tap water remains safe because the city's drinking supply is drawn from alluvial wells that filter water through natural soil before it undergoes micro-filtration, reverse osmosis, and chlorine disinfection, according to SECO News.
The bigger open question involves agriculture. Colorado notified ranches and farms throughout the Arkansas River Valley about the spill, and the Colorado Department of Agriculture has joined CDPHE to work directly with registered produce growers to assess irrigation risks. Under the FDA's Produce Safety Rule, farms covered by the regulation must ensure irrigation water meets adequate quality standards, including generic E. coli limits not exceeding a geometric mean of 126 colony-forming units per 100 milliliters, according to the National Agricultural Law Center.
The timing is precarious for the region's signature crop. The Lower Arkansas River Valley supports roughly 2,000 acres of cantaloupe and 1,000 acres of watermelon annually, centered around Rocky Ford, where harvest season peaks in late August, according to CSU System Magazine. That puts the spill squarely in the middle of the window when growers rely most heavily on river water to irrigate crops headed to market.
Potential Costs for Pueblo
Colorado's Water Quality Control Act gives the state's Water Quality Control Division authority to impose civil administrative penalties of up to $65,544 per day for unpermitted discharges into state waters, under C.R.S. § 25-8-608. Whether the state will pursue enforcement action against Pueblo over the spill remains an open question, as does the long-term cost of repairing or replacing the compromised pipe.
The spill also lands at an awkward moment for a city that has poured money into reclaiming its riverfront. Pueblo has invested heavily in recent years in turning its industrial river corridor into public recreational space, including the opening of WaterWorks Park and improvements along the river trail. For now, officials are focused on tracking the contamination rather than its costs, with more testing results expected in the coming days as they determine when it will finally be safe to get back in the water.
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