234 permit-verified providers serve Williamson County in the Middle Tennessee region. Every listing is checked against TDEC subsurface sewage disposal permit records.
Updated September 1, 2026 · data re-verified against TDEC records
iOrganic order is verified-first then A–Z and is never sold; featured slots, when they exist, are labeled. Methodology
Four things decide what you can build and what it costs: zoning, environmental protections, power for aerobic systems, and the ground itself. We publish each one only where we have checked it — and say so plainly where the answer is “same as the rest of Tennessee”.
Source: Tennessee Department of Environment and Conservation, Division of Water Resources Contacts for Subsurface Sewage Disposal Systems — septic system assistance, naming the nine contract counties ↗ · retrieved Aug 30, 2026
Also: Williamson County, Tennessee — Sewage Disposal ↗ · retrieved Aug 30, 2026
How Tennessee permitting works
Checked against Tennessee Secretary of State, Official Compilation of Rules and Regulations, Tenn. Comp. R. & Regs. 0400-40-03 — General Water Quality Criteria, rule .06 Antidegradation Statement, carrying the Exceptional Tennessee Waters categories and the Outstanding National Resource Waters table (effective March 17, 2024) ↗ · retrieved Aug 30, 2026
Also: Tennessee Department of Environment and Conservation, Division of Water Resources, 2026 Final 303(d) List of Impaired and Threatened Waters (EPA-approved final list) ↗ · retrieved Aug 30, 2026
Source: USDA Natural Resources Conservation Service, Soil Survey Geographic Database (SSURGO), queried via Soil Data Access — interpretation ENG - Conventional On-Site Septic Systems (TN) (Tennessee survey areas saved 27 August to 2 September 2025) ↗ · retrieved Aug 30, 2026
Also: Tennessee Department of Environment and Conservation, Division of Water Resources, Tennessee Ground Water Monitoring and Management — Ground Water 305(b) Report 2016, Figure 3 (Karst Areas of Tennessee) ↗ · retrieved Aug 30, 2026
i3 of 4 local factors researched for this county so far. Each one is published with the authority it came from and the date we read it. Methodology
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