SWPPP requirements in Hamilton County (Chattanooga)

State coverage plus one of Tennessee's lowest local thresholds: Chattanooga can require a permit at 1,000 square feet of disturbance, well below the state acre line.

Chattanooga and Hamilton County take construction stormwater seriously, and the City of Chattanooga in particular has one of the lowest local permitting thresholds in the state. If you are moving dirt here, you may need a local permit for a project far smaller than the one-acre state trigger.

The state permit is your baseline

Anywhere in Tennessee, a project that disturbs one acre or more (including a lot inside a larger common plan of development) needs coverage under the Construction General Permit (TNR100000): a written SWPPP, a Notice of Intent filed in MyTDEC (form CN-0940), twice-weekly inspections documented on form CN-1173, and a Notice of Termination at closeout. If that is new to you, start with Do I need a SWPPP in Tennessee? and how to file your NOI.

The City of Chattanooga's low threshold

Inside the City of Chattanooga, a Land Disturbing Permit is required when 1,000 square feet or more of land-disturbing activity is planned, or when you work near Waters of the State or wetlands. That is dramatically lower than the one-acre state line, so many small commercial and site projects need a city permit even when they are too small for a state SWPPP. The land disturbing team is reachable at 423-643-5892, and applications run through the city's permitting portal and Land Development Office. A few operational rules to plan for: a pre-construction meeting with the stormwater inspector to check perimeter controls and construction exits before grading, self-inspection reports before and after forecasted rain, and site stabilization within 15 days after final grade or whenever an area sits barren more than 30 consecutive days. For sites over one acre, the city confirms your state Notice of Coverage before issuing the permit. Single-family residential construction does not need a city land-disturbing permit, but BMPs are still required, and you must keep the permit, plans, and state approvals posted on site.

Hamilton County's multi-jurisdiction program

Outside the city, Hamilton County runs a joint Water Quality Program with Collegedale, East Ridge, Lakesite, Lookout Mountain, Red Bank, Ridgeside, and Soddy-Daisy under NPDES permit TNS075566. The county's construction permitting office is at 1250 Market Street, Suite 3044, Chattanooga (423-209-7851), and since October 12, 2021, as-built drawings are required with all new permits. There is a single and two-family residential waiver, and a lifetime operation and maintenance agreement applies to permanent stormwater facilities.

What this means for your SWPPP

First, do not assume you are under the acre threshold, in the City of Chattanooga, a quarter-acre of disturbance can trigger a local permit. Confirm whether you are city or county (or one of the smaller municipalities in the county program), then build a SWPPP that supports the local plan review, the pre-construction meeting, and the as-built and maintenance requirements. The TDEC Chattanooga Environmental Field Office, on Riverfront Parkway, is your regional state contact.

Getting your Hamilton County SWPPP

SWPPP Builder generates a field-ready Tennessee SWPPP built to the state Construction General Permit in about an hour. Pricing is flat and posted up front: $349 for a standard non-engineered contractor SWPPP, $99 for a single-family homebuilder plan (built on TDEC form CN-1249), and $499 when your site needs engineered or pre-approved plans. That is a fraction of the $1,500 to $5,000 a consultant typically charges, and you keep the file in your account to reuse and update as the job changes.