Sourced from Tennessee county utility authority information and municipal development plans — last checked July 2026.
Quick answer: in Tennessee’s fast-growing Nashville Metro counties — Williamson, Rutherford, Wilson, and Maury — sewer infrastructure is actively expanding and the question of whether to invest in a new septic system vs. wait for sewer access is a real and legitimate one. In most other Tennessee counties, septic remains the practical long-term choice. Use the tool below for a quick read on your specific situation.
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Tennessee Septic Guide — Free Tool
Could I Connect to Sewer Instead?
In Tennessee’s fast-growing Nashville suburban counties, sewer infrastructure is actively expanding. Before committing to a septic installation, it’s worth knowing whether sewer is already available or coming soon to your area.
This tool reflects general patterns in Tennessee’s growth counties and is not a substitute for checking directly with your county’s utility authority. Sewer availability is ultimately determined by whether your specific address is within a served area, which the local utility can confirm definitively.
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Why This Question Matters in Tennessee Right Now
Tennessee’s extraordinary growth — particularly in the Nashville Metro area — has pushed residential development far into previously rural territory where sewer infrastructure didn’t exist. Williamson County alone has added tens of thousands of new homes over the last decade. Many of those homes were built on septic because sewer wasn’t available at the time of construction.
Now, as municipalities expand sewer systems to keep up with growth, some of those properties are finding themselves within reach of sewer service — or within 5–10 years of being within reach. Before committing to a major septic repair or replacement in one of these counties, the sewer question is worth asking.
What Sewer Connection Actually Costs in Tennessee
If sewer is available at your property, connection typically involves:
- A tap fee paid to the utility authority — commonly $2,000–$8,000 in Tennessee municipalities, though this varies significantly by utility
- Plumber costs to connect your home’s plumbing to the sewer lateral — $1,500–$5,000 depending on distance and site conditions
- Septic system abandonment requirements, which vary by county — some Tennessee counties require pumping and filling the tank, others require removal
- Ongoing monthly sewer fees instead of periodic septic maintenance costs
For most Tennessee properties where sewer is genuinely available, the math often favors connecting — particularly when a major septic repair is already needed. But for properties where sewer is merely “coming eventually,” the timing uncertainty makes the calculation harder.
If Septic Is Your Path
For the vast majority of Tennessee homeowners — particularly outside the Nashville Metro’s fastest-growing counties — septic remains the practical, long-term choice. See our installation cost guide for what a new or replacement septic system costs in your region, and our system type guide for what TDEC is likely to require on your specific site.
Two Legal Points That Decide This Question
Most of the argument about sewer versus septic in Tennessee comes down to two provisions, and both are commonly stated too loosely.
1. When a utility district must give you a connection
Tenn. Code Ann. § 7-82-710(a), as amended by 2026 Public Chapter 1113 (Senate Bill 2057, substituted for House Bill 2385, effective April 22, 2026), clarifies that a utility district wastewater system must provide a connection where an existing gravity sewer line or force main is accessible.
That is useful if you are trying to get onto sewer and being told no. It is a statement of the statute and not advice about your parcel — whether a line is “accessible” to you is a factual question for the utility, and we have not reviewed how TDEC or the utilities are applying the amendment in practice. Ask the utility in writing.
2. When sewer being nearby can stop you getting a septic permit
This is the one that gets misquoted most. 2019 Tenn. Acts ch. 116, effective April 9, 2019, amended § 68-221-409 so that the commissioner “shall not deny a permit for a subsurface sewage disposal system solely because a public sewer system is accessible if” the department or a local government “has placed a moratorium on additional connections to the public sewer system.”
3. And in a contract county, a third route
If you are in one of Tennessee’s nine contract counties — Blount, Davidson, Hamilton, Jefferson, Knox, Madison, Sevier, Shelby or Williamson — local septic standards can be stricter than the state’s, because § 68-221-403(a)(10)(B) requires them to be “at least as stringent as those of the state law and regulations.” Since April 15, 2025, Public Chapter 208 has let the TDEC commissioner grant a variance that supersedes a stricter local requirement — but only for a single lot with a single dwelling, and never for a sewerage system regulated under § 69-3-108 or a system serving multiple lots.
Questions About Sewer vs. Septic in Tennessee?
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Frequently Asked Questions
Can I connect to sewer instead of septic in Tennessee?
It depends on your location. In Tennessee's fast-growing Nashville Metro counties — Williamson, Rutherford, Wilson, Maury — sewer infrastructure is actively expanding and connection may be available or coming soon. In most other Tennessee counties, septic remains the practical long-term choice. Contact your county utility authority to confirm sewer availability for your specific address.
How much does it cost to connect to sewer in Tennessee?
Connecting to sewer in Tennessee typically involves a tap fee of $2,000-$8,000 paid to the utility authority (varies significantly by utility), plumber costs of $1,500-$5,000 to connect your home's plumbing, and septic system abandonment costs. Ongoing monthly sewer fees replace periodic septic maintenance.
Should I repair my septic system or connect to sewer in Nashville, Tennessee?
If sewer is available and you're facing a major septic repair, connecting to sewer often makes financial sense. If sewer is 'coming eventually' but not yet available, the timing uncertainty makes the calculation harder. Contact your county utility authority to confirm availability and timeline before committing to a major septic repair.
What happens to my septic tank when I connect to sewer in Tennessee?
Tennessee counties have varying requirements for septic system abandonment when connecting to sewer. Some require pumping and filling the tank with sand or concrete; others require removal. Contact your county environmental health office for the specific requirements in your county before beginning the sewer connection process.