Did You Miss an Inspection? How to Retroactively Check Rainfall Data
The "Phantom" Rain Event
It's Monday morning. You arrive at the jobsite, and the ground is dry. You assume the weekend was clear and skip the "post-storm" inspection required by your permit.
Two weeks later, a regulator pulls the NOAA data for your zip code. It rained 0.6 inches on Saturday night. You missed the 24-hour window. That is a violation.
The 0.5-Inch Rule
Most Construction General Permits (including the Federal EPA CGP and Texas TPDES) require inspections within 24 hours of a rain event producing 0.5 inches or greater. Some states (like California) have even stricter triggers.
If you are managing multiple sites across town, it is impossible to know exactly how much rain fell at every specific location without a digital gauge.
How to Audit Your History
Before an inspector does it for you, you should self-audit your logs against historical weather data.
We built a free tool to help you do exactly this:
Audit-Proof Your Inspections
Stop relying on paper. Use our free tools or upgrade to full automation.
Using the Tool
- Enter your jobsite address or zip code.
- Our system queries the Open-Meteo historical archive.
- We highlight every day in the last 30 days where precipitation exceeded 0.5 inches.
Compare these dates against your SWPPP binder. If you have a gap, document it immediately in a Corrective Action Log.
The Solution: Automated Monitoring
Checking history is damage control. Real-time alerts are prevention.
RunOffTrack automates this entire process. We geofence your site and ping you the moment a rain threshold is crossed. We even generate the inspection form for you automatically.
Don't let a surprise storm cost you a fine.