4.9 Google
Section 404 dredge-and-fill permits with the Army Corps · Section 401 certification with the Illinois EPA · So construction can proceed
Starting from your wetland delineation and the Army Corps’ jurisdictional determination, we identify exactly which approvals your project needs — a Section 404 Nationwide or Individual Permit, Section 401 certification, and any local stormwater or wetland permits.
We assemble the permit application — impact drawings, the alternatives analysis, and any required compensatory mitigation design — and submit it to the Army Corps and Illinois EPA, scoped to the least burdensome permit your project qualifies for.
We manage agency review, respond to comments, and coordinate the federal, state, and local approvals so they move together — getting your permit issued so construction can proceed on schedule.
Permitting is the step that turns wetland findings into approval to build. A delineation and jurisdictional determination establish what’s regulated on your site; ecological permitting gets the authorization to impact it; and a threatened & endangered species review runs alongside when protected species are in play.
"We were running up against some deadlines, and they jumped through hoops to get everything completed on time."
"The A3E team did a great job on our Phase 1 report. They were quick, thorough and professional."
"They were able to give me all of the information that I needed. Highly recommend A3 Environmental."
Lab-validated sampling
Small business (WOSB)
Environmental consulting
Google Reviews
If your project will place dredged or fill material into a wetland, stream, or other Water of the United States, federal law requires a permit before you build. The core authorization is a Clean Water Act Section 404 permit from the U.S. Army Corps of Engineers, paired with a Section 401 Water Quality Certification from the Illinois EPA. Getting those approvals — cleanly, and without stalling the project — is what ecological permitting is. A3 Environmental prepares and manages the applications and shepherds them through the agencies so your schedule holds.
The Army Corps authorizes wetland impacts two ways. A Nationwide Permit (NWP) is a general permit for categories of activity that cause no more than minimal individual and cumulative impacts — it’s faster, and the Corps reissues the NWP program every five years. An Individual Permit is required when impacts are more than minimal; it goes through a public-interest review and the Section 404(b)(1) Guidelines and takes considerably longer. The right path depends on how much wetland your project affects — and a good consultant designs the project to qualify for the lighter permit wherever possible.
Under Section 401, the state — the Illinois EPA — reviews the federal permit to protect state water quality and can certify, condition, or deny it. Most Nationwide Permits are covered by a programmatic (pre-established) certification; Individual Permits need their own. Beyond the federal and state layers, the Army Corps may also require Rivers and Harbors Act Section 10 authorization for navigable waters, and county stormwater agencies and municipalities in the Chicago region frequently regulate wetlands locally — and can be stricter than the federal program. A3 Environmental coordinates all of it.
When a permit authorizes wetland impacts, the Corps usually requires compensatory mitigation — restoring or creating wetlands, or buying credits from an approved mitigation bank — to offset the loss, and A3 Environmental designs that into the application. Permitting is the natural next step after a wetland delineation and jurisdictional determination establish what’s regulated, and it runs alongside a threatened & endangered species review when protected species are in play. A3 Environmental handles ecological permitting across Northern Illinois and the Midwest, within roughly a two-hour radius of Naperville — backed by a 4.9★ Google rating since 2015.
