Septic is everywhere out here
Johnson City has city sewer, but a large share of homes in rural Washington, Carter and Sullivan counties — Piney Flats, Telford, Limestone, the ridges and hollows between towns — treat their wastewater with an on-site septic system. When it works, it's invisible. When it doesn't, every drain in the house tells you at once. If you're unsure which system you have, the septic-or-sewer guide walks through how to tell; the short version is your water bill and the absence of a sewer lateral.
How a septic system works, in one paragraph
Everything that drains from the house reaches a buried tank. Solids settle to the bottom as sludge; fats and oils float to the top as scum; the liquid middle layer flows out to the drain field, where it seeps through soil that finishes the treatment. Two things end a system's life: the tank fills with solids and they wash into the field, or the field itself fails. Pumping prevents the first and catches the second early.
How often to pump
The EPA's SepticSmart program advises that household septic tanks generally need pumping every three to five years, sooner with a large household, a small tank or a garbage disposal in constant use. An inspection is also recommended about every three years. Rather than guessing, have the tank measured: pumping is due when the sludge layer is within about a foot of the outlet or the scum layer is within about six inches of it. A pumper can tell you on the spot and leave a record you can keep.
Signs the tank is full or the system is struggling
- Slow drains in several fixtures at once
- Gurgling in the pipes, or a toilet that burps when the washer drains
- Sewage smells indoors or near the tank
- Soggy, spongy ground or unusually lush, bright green grass over the drain field
- Sewage backing up into the lowest tub or floor drain — stop using water and call the same day
Slow drains alone can also mean a clogged line, which is a drain cleaning job rather than a pumping. The difference: a line clog backs up fixtures nearest the house; a full tank or failing field shows up everywhere and often with yard symptoms.
What the service involves
Pumping: the pumper locates the tank lids, opens them, stirs and pumps out the contents, sprays down the walls to check for cracks and baffles, and reports what they saw — baffles intact, no root intrusion, liquid level normal. A short job once the lids are found.
Repairs and diagnosis: a plumber or septic contractor checks the line from house to tank, the tank, and the field. Some repairs are plumbing (a crushed line, a broken baffle); others are field work. Note that repair work is regulated — see the permit section below.
Permits: who regulates septic in this area
Tennessee's Department of Environment and Conservation (TDEC), Division of Water Resources, administers the state's subsurface sewage disposal program. Permits are required to construct — and in the case of certain repairs, to modify — a septic system, and the disposal of tank pumpings is regulated too. TDEC's Johnson City Environmental Field Office, which covers Washington, Carter, Sullivan and Unicoi counties among others, handles permits for this area, listed at 2305 Silverdale Drive, phone (423) 854-5400. Practical takeaway: a new system, a relocated tank or a major repair likely needs TDEC sign-off first, so ask your contractor what's permitted before work starts. Routine pumping and like-for-like minor repairs generally don't — but a quick call to the field office settles it for your specific property.
What affects the price
Tank size, how deep the lids are buried (digging adds time; risers make the next visit cheap), how long since the last pump (heavier solids), and travel distance all move a pumping quote. Repairs range widely with what failed and whether permits apply, so get the diagnosis first and the price in writing before any digging.
Caring for a system between pumpings
- Spread out laundry loads; a day's worth in one afternoon floods the field
- No grease down the drain, no "flushable" wipes, no feminine products
- Go easy on the garbage disposal; on septic it can double the solids load
- Divert gutters and sump discharge away from the drain field
- Keep vehicles and heavy equipment off the field and tank area
- Keep deep-rooted trees and shrubs away from tank and field lines
What we handle
Calls are routed to licensed plumbers and septic contractors serving the rural counties around Johnson City — from routine pumping to diagnosing a system that's failing. For field-specific problems, see drain field repair. And if sewage is actually coming into the house right now, the sewer-backup guide covers the immediate steps; make the call first.