Sycamore Pool in Chico, California: No-Swim Advisory, Tests Miss E. coli Strain

Key Takeaways

• Sycamore Pool in Chico's Bidwell Park is under a new "no swim" advisory after elevated E. coli levels were found.
• Standard testing at the pool cannot detect the specific E. coli strain linked to the summer 2025 outbreak that sickened four children.
• The advisory signals a potential health risk, but the lack of strain-specific testing leaves a gap in water safety monitoring.

What the Elevated Readings Mean

On Thursday, Aug. 6, 2026, a "no swim" sign was posted at Sycamore Pool in Bidwell Park after testing showed elevated E. coli levels. The Chico Enterprise-Record reported that the warning is meant to protect swimmers from exposure to bacteria that can cause illness.

"A year after an E. coli outbreak sickened four children at Bidwell Park's Sycamore Pool, elevated bacteria levels are prompting warnings about swimming there."

Yet the testing method used for the pool measures total E. coli only. It cannot identify whether the dangerous strain that caused the 2025 outbreak is present.

The 2025 Outbreak and the Testing Gap

In summer 2025, an E. coli outbreak at Sycamore Pool sickened four children. That event put a spotlight on the safety of the popular swimming hole in Chico's main park.

The current protocol cannot confirm the presence or absence of the outbreak strain. This means swimmers and local officials are left with an incomplete picture of the risk, even as the no-swim sign blocks access.

Local Context: Chico and Bidwell Park

Sycamore Pool is a well-known summer destination in Chico, located in the One-Mile area of Bidwell Park. The park is a central gathering place for families across Butte County, and the pool draws residents looking to cool off during hot summer days.

The advisory affects locals who rely on the pool during warm weather, and it raises concerns about how to monitor water quality at a popular outdoor swimming spot.

Background

The 2025 outbreak was a warning about the health risks in natural swimming areas. A year later, the new advisory shows E. coli remains a concern at the same pool.

Conclusion

For now, the message is simple: respect the posted no-swim sign. Because the tests cannot detect the 2025 strain, the elevated bacteria reading should be treated as a serious warning, not just a routine caution.

Residents should follow local news and official announcements for updates on when Sycamore Pool can be safely reopened.

Sources and Materials

• chicoer