Updated 2026-08-07 · Reset Water Damage Team
Why Boulder County floods escalate fast
Foothill drainages, Boulder Creek, St. Vrain Creek, Left Hand Creek, and Coal Creek can push outdoor water into basements and crawl spaces within minutes of an intense cell. Soil saturation after snowmelt makes the same storm more damaging in April–June.
Category 1: Clean water
Broken supply lines and some appliance failures start as Category 1. If extracted and dried quickly, many materials can be saved. Delay, or mixing with contaminants, can elevate the category.
Category 2 and 3: Gray and black water
Stormwater that contacted soil, streets, or creek channels, plus sewage backups, are Category 2 or 3. These losses need PPE, controlled removal of porous materials, and antimicrobial protocols. Do not treat creek intrusion like a simple mop job.
What to do after flash-flood intrusion
Prioritize safety, photograph water lines on walls, avoid DIY ozone or bleach “fixes,” and call (720) 727-1129 for Boulder County dispatch. Professional moisture mapping finds water behind baseboards and under pads that household fans miss—the moisture that becomes mold in 24–48 hours.
Front Range Service Areas
Frequently Asked Questions
Is creek water in my Boulder basement sewage?
It may not be sanitary sewer, but outdoor floodwater is still contaminated (Category 2/3). Treat it as unsafe for DIY cleanup and use certified restoration protocols.
Where can I read about Longmont basement flood steps?
See our guide on Longmont basement floods in the first 2 hours, then call (720) 727-1129 for immediate extraction help.