SW

Stormwater Directory

Tennessee

Tennessee Department of Environment and Conservation

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Quick Summary

For most Tennessee projects disturbing 1 acre or more, you need a state NPDES Construction General Permit and a SWPPP. A one-time application fee applies (e.g., $250 for 1 to < 5 acres), plus annual maintenance fees if the project exceeds one year. Inspections occur every 14 days.

State-DelegatedVerified 2026-09

Construction Permit

Permit Document ↗
Permit Name
NPDES General Permit for Stormwater Discharges from Construction Activities (Permit No. TNR100000)
Threshold
≥ 1 acre of land disturbance (or < 1 acre if part of a larger common plan of development or sale that will ultimately disturb ≥ 1 acre); all sites must also comply with Tennessee's Construction General Permit and the Stormwater Management Act
NOI Lead Time
NOI must be submitted to TDEC at least 7 calendar days before commencement of land-disturbing activity; construction may not begin until the 7-day waiting period expires or TDEC confirms coverage; for sites discharging to waters on the 303(d) impaired waters list, TDEC may require additional review time
Application Method
Online via TDEC's myTDEC online portal (available through the TDEC website); paper NOI submission is also accepted; annual fees and permit renewals managed through the same portal
Fee
One-time application fee (e.g., 1 to < 5 acres: $250; 5 to < 20 acres: $1,000) plus annual maintenance fees for projects exceeding one year (e.g., 1 to < 5 acres: $125/year; 5 to < 20 acres: $500/year)
Permit Expires
September 30, 2026
Apply for Permit ↗

SWPPP Requirements

Permit Document ↗
SWPPP Required
Yes
PE Cert Required
No
Template Available
Yes
A Stormwater Pollution Prevention Plan (SWPPP) is required for all sites covered under TNR100000 and must be prepared before land-disturbing activity begins. No Professional Engineer stamp is required for standard construction SWPPP preparation. TDEC provides a SWPPP template and technical guidance manual on its website. The SWPPP must be kept on-site and made available to TDEC inspectors upon request. Tennessee also requires compliance with the Tennessee Erosion Prevention and Sediment Control (EPSC) handbook, which is the primary BMP reference for the state. Sites within MS4 jurisdictions must also comply with local SWPPP and EPSC requirements.

Inspection Requirements

Permit Document ↗
Frequency
At least once every 14 calendar days during active construction and within 24 hours after any storm event producing ≥ 0.5 inches of precipitation; inspections must document BMP conditions, discharges, and corrective actions; during periods of extended inactivity, at least monthly inspections are required
Rain Trigger
Within 24 hours of any storm event producing ≥ 0.5 inches of precipitation
Inspector Qualification
Inspector must be a 'qualified personnel' with training in construction stormwater management principles; Tennessee does not require a specific state license for construction site inspectors under TNR100000, but TDEC recommends certifications such as CPESC or completion of a recognized stormwater training program; municipalities under Phase II MS4 permits may require additional inspector qualifications under local ordinances
Accepted Certifications
No state-specific mandatory cert; inspector must be 'qualified personnel'; CPESC, CESSWI accepted; municipalities under Phase II MS4 permits may impose additional local requirements

Discharge Standards

Permit Document ↗
Turbidity Limit
No numeric NTU turbidity limit in TNR100000; narrative water quality standards apply; however, Tennessee has a numeric turbidity criterion of 10 NTU above background for certain high-quality streams
Tennessee water quality standards (Tennessee Rule 0400-40-03) include a narrative turbidity standard and, for Exceptional Tennessee Waters and certain trout-designated streams, a numeric increase limit of no more than 10 NTU above natural background. Sites discharging to such waters must implement heightened BMPs. The general permit does not establish a universal numeric turbidity effluent limit, but narrative standards prohibit discharges that cause or contribute to violations of applicable water quality criteria. Visual monitoring of discharges is required at each inspection event.

Post-Construction

TDEC ↗
Required
Yes
Post-construction stormwater management is required under TNR100000 and Tennessee's Phase II MS4 permit program. Final stabilization requires ≥ 70% uniform vegetative cover or equivalent permanent stabilization before a Notice of Termination (NOT) is filed. TDEC's MS4 program requires regulated municipalities to establish and enforce post-construction stormwater management standards. Tennessee's Stormwater Management Act (T.C.A. § 69-3-1401 et seq.) requires post-construction controls for development projects exceeding applicable thresholds. TDEC's Stormwater Management Guidance Manual provides design standards and BMP references for permanent post-construction controls.

Impaired Waterbody / TMDL Requirements

Standard Provisions

Tennessee TDEC's NPDES construction stormwater permit has standard provisions for most projects. Some enhanced requirements apply near Class I-Exceptional Tennessee Waters (Outstanding National Resource Waters), but no systematic heightened conditions are triggered solely by 303(d)-listed water impairment status in the general permit. Standard stormwater BMPs apply.

Program Contact

Contact Page ↗
Phone
1-888-891-8332
Email
Water.Permits@tn.gov

State-Specific Notes

Tennessee's construction stormwater program charges a one-time application fee plus annual maintenance fees for projects that exceed one year. TDEC administers the program through its Division of Water Resources. The 2021 CGP expires September 30, 2026, with the replacement CGP planned effective October 1, 2026. Tennessee's Erosion Prevention and Sediment Control (EPSC) Handbook (Blue Book) is the required BMP reference and is incorporated by reference into the general permit. Sites near Exceptional Tennessee Waters (ETW) or Wild and Scenic rivers must implement heightened BMPs and may need individual permit review. Tennessee is also unusual in having a partial numeric turbidity criterion (10 NTU above background) for certain high-quality classified waters, which can affect construction sites near trout streams and other sensitive waters. TDEC conducts active site inspections and can issue notices of violation with penalties for non-compliance.

Disclaimer: This information is provided for general reference only and may not reflect the most current regulatory requirements. Always consult the TDEC website and applicable regulations before beginning any construction activity.