The swim beach closed at 10 a.m. Tuesday. Additional testing was being done for the naturally occurring bacteria, with results expected in about 24 hours, CPW said on Twitter. If those results come back normal, the swim beach can reopen, a CPW spokesman said.
Under guidelines from the Colorado Department of Public Health and Environment (CDPHE), natural swim areas are tested for E. coli on a weekly basis. If a result shows an E. coli concentration above 235 organisms per 100 milliliters, the beach must be closed, CPW says on its website.
Of two tests conducted recently, one came back normal and one came back elevated, the CPW spokesman said.
The temporary closure due to E. coli only affects the swim beach.
CPW says elevated E. coli results can be caused by:
- Fecal waste from swimmers, pets or wildlife.
- Improperly disposed dirty diapers.
- Excessive runoff from rain or flood.
- Runoff from urban, suburban or rural areas.
- Malfunctioning septic systems.
> Video above: People enjoy Chatfield State Park on the first normal holiday weekend since COVID-19
SUGGESTED VIDEOS: Latest from 9NEWS
MORE WAYS TO GET 9NEWS
Subscribe to our daily 9NEWSLETTER
HOW TO ADD THE 9NEWS APP TO YOUR STREAMING DEVICE
ROKU: add the channel from the ROKU store or by searching for KUSA.
For both Apple TV and Fire TV, search for "9news" to find the free app to add to your account. Another option for Fire TV is to have the app delivered directly to your Fire TV through Amazon.