Massachusetts SWPPP inspections: did rain trigger one?
Enter the site address. See 14 days of rain against the 0.25 in line.
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.
Massachusetts: the rule
Inspect every 14 calendar days and within 24 hours of 0.25 in of rain or more in 24 hours. A storm with 0.25 in or more on several days in a row needs an inspection after the first day and after the last such day.
| Permit | EPA Construction General Permit (14-day option) |
|---|---|
| Rain that triggers | 0.25 in in 24 hours |
| Inspect within | 24 hours |
| Routine | every 14 days |
| Source | EPA 2022 CGP Part 4.2.2.a (and footnotes 68–69); Part 4.2.3 rain gauge or representative weather station |
Your permit coverage and your site's SWPPP have the final word. Sites that discharge to impaired or high-quality waters often inspect more often.
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.
Email me the PDF
We'll send this to you as a PDF, plus a reminder if there's a date in it. One email, no list.
We use it to send this and nothing else. See privacy.
Questions crews ask
How much rain triggers a SWPPP inspection in Massachusetts?
0.25 inches or more in 24 hours under the EPA Construction General Permit (14-day option). Inspect within 24 hours, plus routine inspections every 14 days.
Which permit covers construction stormwater in Massachusetts?
EPA is the permitting authority in Massachusetts, so construction sites use EPA's 2022 Construction General Permit.
What if it rains several days in a row?
Inspect after the first qualifying day and after the last one, not every day in between.
Where does the rule come from?
EPA 2022 CGP Part 4.2.2.a (and footnotes 68–69); Part 4.2.3 rain gauge or representative weather station
Related free tools
Your site at 6 a.m., before you're there.
Free for one site and one camera. $99 a site after. Crew is always free. 7 days of everything free, no card.