Guide · checked Nov 12, 2026
Septic or sewer? What connecting costs around Chattanooga
If sewer is coming down your road, or you're comparing a house on septic with one on sewer, these are the numbers that matter, straight from the WWTA's rules and the City's fee schedule.
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Who runs the sewer where you live
The Hamilton County Water and Wastewater Treatment Authority (WWTA) runs public sewer in unincorporated Hamilton County and in East Ridge, Lakesite, Lookout Mountain, Red Bank, Ridgeside, Signal Mountain and Soddy-Daisy (423-209-7842). Inside Chattanooga, sewer connections go through the City's plumbing permit. In North Georgia, see Ringgold and Catoosa County or Walker County.
When you have to connect (WWTA area)
The WWTA's rules, which incorporate Tennessee Code Annotated 7-35-201, say that if your land abuts a street or easement with a public gravity sewer or a WWTA low-pressure sewer, and your building can be connected (by gravity, or by pumping into the low-pressure line), you must make and keep that connection at your own expense. Sewer charges start once the property has access to the sewer, whether or not you have connected. On Signal Mountain, the whole system is under a state moratorium on new connections.
What connecting costs
| Item | Amount | Notes |
|---|---|---|
| WWTA residential tapping privilege fee | $800 | Meter under 1 inch. Doesn't include furnishing and installing the service line. Non-transferable and non-refundable. |
| WWTA failed inspection | $100 each | If the inspector comes out and the line isn't installed, or is installed wrong, the plumber pays $100 for each extra inspection. |
| Grinder pump or STEP system | Same $800 tap fee | A STEP tank location drawing must be approved first. WWTA doesn't maintain residential grinders or STEP systems built after May 1, 2019 (case-by-case exceptions). |
| Chattanooga plumbing permit | $40 + items | $20 per building sewer, $70 per sanitary sewer connection, $800 per lateral sewer connection provided, $50 per re-inspection. |
| The service line itself | Plumber's quote | Length, depth, rock and any road cut drive the price. Get more than one quote. |
Only a licensed master plumber can pull the permit: in the WWTA area, the plumber who installs a gravity service line obtains the tap-on permit and calls for the inspection; in Chattanooga, a City Master Plumbing License is required to pull a plumbing permit.
What sewer costs each month (WWTA, from Oct 1, 2026)
| Charge | Gravity sewer | WWTA-maintained grinder/STEP |
|---|---|---|
| First 100,000 gallons a month, per 1,000 gallons | $20.45 | $22.50 |
| Minimum monthly bill (meter under 1 inch, 2,054 gallons) | $28.69 | $31.56 |
| Private Service Lateral Program fee | $8 a month | n/a |
For example, at 4,000 gallons in a month a gravity customer would pay 4 × $20.45 = $81.80, plus the $8 fee, so $89.80 (our arithmetic from the published rates; check your own bill). Rates change every October 1.
Septic has no monthly bill, but it isn't free: the EPA says to have it inspected about every three years and pumped every three to five, and our cost guide lists 2026 national prices for pumping, repairs and drain fields.
Getting sewer to a neighborhood with failing systems
The WWTA's extension policy lets a neighborhood with septic problems ask for sewer. The area has to be verified as a potential health hazard by a Regional Health Department study, at least 70% of owners must agree to contribute, and owners together pay 60% of the project cost or the sum of their tap fees, whichever is greater. Owners' tap fees are included in that payment. Anyone along the line who didn't take part pays their share plus a normal tap fee later, and homes the Health Department identified as having problems must connect within 60 days after the sewer is finished.
What happens to the old tank
The EPA says that, depending on state and county rules, you may have to remove an abandoned tank, or may be allowed to abandon it in place. Ask the permitting office before the plumber backfills: Hamilton County Groundwater Protection in Tennessee, or county Environmental Health in Georgia, where the state rule says an abandoned tank must be pumped by a certified pumper and filled, or removed. See septic permits and rules for contacts.
Staying on septic for now? Pumping, inspections and repairs are what we can help with. Related: inspection, what not to flush.
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Sources
- Hamilton County WWTA, Sewer Use Rules and Regulations (updated through Oct 27, 2026, PDF)
- Hamilton County WWTA, About the WWTA
- Hamilton County WWTA, Frequently Asked Questions
- Hamilton County WWTA, Community Questions Regarding the Signal Mountain Project
- City of Chattanooga, Request a Plumbing Permit (requirements and fee schedule)
- U.S. EPA, How to Care for Your Septic System
- U.S. EPA, Frequent Questions on Septic Systems
- Ga. Comp. R. & Regs. 511-3-1-.17, Maintenance and Operation (via Cornell LII)
Prices are national ranges published by the sources above, not quotes. Your price depends on the system, access and timing; local companies quote after seeing the job.