TNState-AdministeredSWPPP Requirements in Tennessee
Tennessee's construction stormwater program is notable for its dual-permit structure. The TNR100000 NPDES permit handles stormwater discharges, while a separate Tennessee Aquatic Resource Alteration Permit (ARAP) is required for any project that impacts streams, wetlands, or other waters of the state. ARAP is one of the most significant state-specific construction permits in the Southeast—it covers stream crossings, culvert installations, bank grading, and any fill activity in wetlands or streams. Projects that fail to obtain ARAP before impacting waters can face stop-work orders and restoration requirements. Nashville's construction boom—the metro area has been among the fastest-growing in the US since 2015—generates enormous TDEC inspection and compliance workload. The Cumberland Plateau in east-central Tennessee and the Tennessee River basin in the west drain to a combination of TVA-managed reservoirs and free-flowing rivers with significant ecological and recreational value. The state's karst geology in middle Tennessee creates sinkhole and cave stream risks similar to Kentucky, requiring karst-specific SWPPP provisions in those areas.
Tennessee SWPPP Key Facts
- ✓Tennessee ARAP (Aquatic Resource Alteration Permit) required for any stream or wetland impact—separate from and in addition to TNR100000
- ✓ARAP timelines can run 3–12 months—engage TDEC early for any project near streams or wetlands
- ✓Nashville metro construction boom drives high TDEC inspection volume and enforcement activity
- ✓Middle Tennessee karst geology (similar to Kentucky) requires karst-specific SWPPP provisions
- ✓$0 SWPPP NOI fee; ARAP fees vary by tier
Administering Agency
- Agency
- Tennessee Department of Environment and Conservation, Division of Water Resources (TDEC)
- Phone
- 615-532-0625
- tdec.waterresources@tn.gov
- Website
- TDEC Stormwater Program
Permit Details
- Permit Name
- NPDES General Permit for Stormwater Discharges Associated with Construction Activities
- Permit Number
- TNR100000
- Effective Date
- 2021-10-01
- Expiration Date
- 2026-09-30
- Permit Document
- View Current Permit
SWPPP Thresholds & Triggers
- Acreage Threshold
- 1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development
Tennessee Aquatic Resource Alteration Permit (ARAP) required for any activity that impacts streams, wetlands, or other waters of the state—this is separate from and in addition to the TNR100000 SWPPP permit. Nashville metro construction boom creates high inspection volume. Cumberland Plateau and Tennessee River basin require sediment and nutrient controls for Chesapeake Bay-equivalent water quality obligations.
Inspection Requirements
- Inspection Frequency
- At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or more
- Rain Event Threshold
- 0.5 inch in a 24-hour period
- Certified Inspector
- Not required by state
Tennessee's ARAP permit requirement is arguably more operationally significant than the SWPPP for projects near streams. ARAP is administered by TDEC's Division of Water Resources and requires separate application, review, and approval before any work begins that would alter streams or wetlands. ARAP timelines can run 3–12 months depending on project complexity.
Penalties & Enforcement
- Max Civil Penalty (Per Day)
- $10,000 per day per violation (state); federal enforcement up to $25,000/day
- Criminal Penalties
- Criminal penalties under Tennessee Code Annotated §69-3-115 for willful violations
TDEC enforces both TNR100000 and ARAP requirements. Nashville metro construction volume drives high enforcement activity. ARAP violations are treated seriously and can result in stop-work orders for stream impacts occurring without permit coverage.
Permit Fees
- NOI Filing Fee
- $0
- NOT Filing Fee
- $0
- Other Fees
- ARAP permit fees vary by permit tier and project impact level—can range from $0 to several thousand dollars.
How Tennessee Differs from Federal Requirements
- ⚠Tennessee ARAP requirement is a state-specific additional permit layer for stream and wetland impacts—significantly more extensive than any comparable federal CGP provision.
- ⚠ARAP stop-work authority for stream impacts without permit coverage is a Tennessee-specific enforcement tool.
- ⚠$0 SWPPP NOI fee in Tennessee; ARAP fees are separate and vary by tier.
SWPPP Tips for Tennessee
- ➤File for ARAP before finalizing your project design—ARAP requirements may require stream crossing design changes, buffer widening, or alternative construction sequencing.
- ➤Nashville metro contractors: TDEC's Nashville regional office is high-volume. Allow extra lead time for permit processing and expect active inspection during construction.
- ➤Middle Tennessee karst projects: identify sinkholes and cave streams on the Tennessee Geological Survey karst maps before preparing your SWPPP.
- ➤Tennessee River basin and TVA reservoir watershed projects: contact TVA's Environmental Review staff early—TVA may have riparian buffer requirements independent of TDEC.
Tennessee SWPPP FAQs
What is the Tennessee ARAP and when is it required?+
The Aquatic Resource Alteration Permit (ARAP) is a state permit required for any activity that alters streams, wetlands, or other waters of the state—including stream crossings, culvert installations, bank grading, and wetland fill. It is administered by TDEC's Division of Water Resources and is separate from the TNR100000 construction stormwater permit. Both are required for projects impacting waters.
How long does the ARAP process take in Tennessee?+
ARAP review timelines vary by permit tier. Tier 1 permits (minimal impacts) may be processed in 30–60 days. Tier 2 and Tier 3 permits with significant stream or wetland impacts can take 3–12 months. Begin the ARAP process before completing final project design—ARAP requirements may necessitate design changes.
Does the Nashville metro area have additional stormwater requirements?+
Yes. Metro Nashville/Davidson County, Williamson County, and other fast-growing Middle Tennessee counties operate MS4 stormwater programs with local grading and stormwater ordinances. Check with the local planning or public works department for county-specific requirements in addition to TNR100000.
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