Slip-Lining Culvert Pipes

When a culvert begins to corrode, crack, or separate at the joints, engineers and highway departments often face a choice between excavating the old pipe and installing a new one or rehabilitating the existing structure in place. Slip-lining is the most widely used trenchless rehabilitation techniqu…continue

Construction Site Runoff Control: Keeping Sediment, Chemicals, and Fines Out of Your Storm Drains

(In the photo above, the silt fence has been improperly installed, as you can see it was placed in loose, already excavated, soil.) Why Construction Runoff Matters A single acre of bare earth can release 10 - 20 times more sediment than the same acre in cropland, and up to 2,000 times more than a fo…continue

Good, Better, Best: Levels of Documentation That Satisfy Auditors

Why this matters Every MS4 audit, whether it’s a quick screening or a multi-day deep dive, starts with one question: “Show me the records.” Communities that can put the right document on the table (or screen) in seconds walk away with clean reports and lower stress; those that scra…continue

Keeping Pace with the 2025 MS4 Permit Updates

What Changed & Why It Matters for Your Stormwater Program Why new MS4 rules landed in 2025 EPA’s 2015 NPDES Electronic Reporting Rule (the “e-Rule”) postponed many Phase II requirements to give states time to build electronic portals. That grace period ends 21 December 2025, so…continue

Inspecting Catch Basins and Culverts: A Critical Component of MS4 Compliance

Proper inspection and maintenance of stormwater infrastructure, especially catch basins and culverts, is vital to ensure effective drainage performance, prevent flooding, and comply with Municipal Separate Storm Sewer System (MS4) regulations. These structures are often the first and most visible co…continue