Did rain trigger a SWPPP inspection?
Enter the site address. See 14 days of rain and which inspections were due.
Sample site · 1.52 in over 14 days. EPA Construction General Permit (14-day option): inspect within 24 hours of 0.25 in or more, plus every 14 days.
- Sun, Nov 1: 0.40 in → inspect by Mon, Nov 2
- Thu, Nov 12: 0.80 in → inspect by Fri, Nov 13
Rain from Open-Meteo for the site's location. A gauge on site beats any weather service; your permit has the final word.
When rain triggers a SWPPP inspection
Construction stormwater permits make you inspect on a schedule and after storms. The numbers differ by permit:
| Permit | Rain that triggers | Inspect within | Routine |
|---|---|---|---|
| EPA Construction General Permit (14-day option) | 0.25 in | 24 hours | every 14 days |
| EPA CGP, sediment/nutrient-impaired or Tier 2/2.5/3 waters | 0.25 in | 24 hours | every 7 days |
| Texas TPDES Construction General Permit (TXR150000) | 0.5 in | 24 hours | every 14 days |
| Georgia NPDES stand-alone construction (GAR100001) | 0.5 in | 24 hours | every 7 days |
| North Carolina NCG010000 | 1 in | 24 hours | every 7 days |
Under the EPA permit, a storm that's over the line on several days in a row needs an inspection after the first day and after the last one, not every day in between. Your state's permit, or your site's SWPPP, can be stricter. It has the final word.
What to check
- Silt fence and wattles: standing, trenched in, not overtopped
- Inlet protection: in place and not clogged
- Construction entrance: rock not buried in mud; no tracking onto the street
- Stockpiles: covered or ringed
- Concrete washout: not overflowing
- Stabilized areas and discharge points: no gullies, no muddy water leaving the site
Write what needs fixing and fix it by your permit's deadline. Photos before and after make the record.
State rules: Texas · Georgia · North Carolina
Next storm, the inspection is drafted before you're awake.
Dozer watches the rain at the site and the forecast. When a storm crosses the line, it photographs the BMPs from the cameras and drafts the inspection for your inspector to sign.
- Rain measured at the site, not the airport
- The inspection due date counted for you
- BMP photos from the site cameras, before and after
- A signed report in the site's records
LIVE SWPPP inspection due after 0.8 in of rain Photo is an AI-generated stand-in, not a customer site.
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Questions crews ask
How much rain triggers a SWPPP inspection?
Under the EPA's 2022 Construction General Permit, if you inspect every 14 days you must also inspect within 24 hours after a storm of 0.25 inches or more. Some state permits set their own number: Texas and Georgia use 0.5 inches and North Carolina 1.0 inch. Your permit has the final word.
How often do SWPPP inspections have to happen?
Under the EPA CGP: at least once every 7 calendar days, or once every 14 days plus within 24 hours of a 0.25 inch storm. Sites that discharge to sensitive waters inspect more often.
Where does the rain data come from?
Daily totals for the site's location from Open-Meteo, a public weather service. A rain gauge on site is better; Dozer uses yours if you have one.
What do I check on a SWPPP inspection?
Silt fence and wattles, inlet protection, the construction entrance, stockpiles, concrete washout, stabilized areas and any discharge points. Note what needs fixing and fix it by the deadline in your permit.
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