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Every septic install in Kentucky requires a county-permitted installer. The Bullitt County Health Department maintains the official list of contractors who hold a current annual permit.
View Bullitt County permitted installers → or call 502-955-7867In Bullitt County, Kentucky, a new septic system runs most homeowners between $5,200 and $13,200, with shallow-limestone lots in the Knobs around Bardstown Junction and the steep Salt River bluffs frequently exceeding $19,000 when engineered or mound designs are required. Bullitt sits directly south of Louisville along the I-65 corridor, in the Outer Bluegrass / Knobs transition zone — Louisville’s most-active exurb and the fastest-growing county between Louisville and Elizabethtown.
About 60% of Bullitt County households are on septic. Shepherdsville, Mt. Washington, and Hillview have growing sewered cores, but the bulk of the county — Lebanon Junction, Pioneer Village, the rural sections south of I-65 — runs on private systems. Bullitt’s growth has stretched installer schedules 8–12 weeks out, especially during the spring building season.
At-a-glance: Bullitt County septic costs in 2026
| Service | Typical range | Most common bill |
|---|---|---|
| New septic install — conventional gravity | $5,200–$8,500 | $6,800 |
| New septic install — LPP or pressure-dosed | $9,000–$13,200 | $10,800 |
| New septic install — mound or engineered | $13,000–$19,000+ | $15,500 |
| Drain field repair | $2,200–$6,200 | $3,800 |
| Drain field full replacement | $6,000–$18,000 | $10,500 |
| Septic tank pumping (1,000 gal) | $300–$575 | $425 |
| Septic inspection (for real estate) | $295–$575 | $385 |
| Site evaluation fee (county) | $250 | $250 |
| Septic tank replacement only (1,000 gal) | $1,550–$3,200 | $2,250 |
| Riser & lid installation | $325–$850 | $525 |
Ranges reflect bids gathered from Bullitt County certified installers, January–April 2026. Site evaluation fee is set by Bullitt County Health Department.
Why septic costs in Bullitt County vary by where the Knobs start
Bullitt County straddles a geologic transition that drives the entire cost variance. North and west of I-65, the Outer Bluegrass produces the Crider and Pembroke silt loams with excellent perc and deep workable soil. South and east, the Knobs subprovince climbs into capped sandstone/shale ridges where conventional systems struggle:
- Outer Bluegrass workability. The Crider and Pembroke soils across most of the county’s western half sit on solution-weathered limestone with 4–8 feet of cooperative soil column. Conventional gravity installs are straightforward and inexpensive — frequently the cheapest in Kentucky.
- Knobs caprock challenges. The Knobs caprock — sandstone and shale erosional remnants south and east of Shepherdsville — produces Caneyville and Beasley soils that are shallower, slower-percolating, and frequently underlain by competent rock at 24–30 inches. LPP, pressure-dosed, and engineered designs are the norm in Knobs sections.
- Karst features in central county. The limestone-Knobs interface has localized karst — sinkholes, springs, solution cavities — particularly south of Shepherdsville and along Salt River drainages. Setbacks here can void a standard site evaluation.
Cost breakdown by service type
New septic system installation — $5,200 to $19,000+
A conventional gravity install on a Crider or Pembroke lot in the Outer Bluegrass section — most of Shepherdsville’s rural fringes, the Hillview area, and the I-65 corridor — runs $5,200–$8,500 all-in. Bullitt County’s allowance of certified-installer permits and homeowner-installer paths under Kentucky regulation 902 KAR 10:085 keeps the floor competitive.
LPP and pressure-dosed systems run $9,000–$13,200 for the shallow-soil Knobs sections — south of I-65, the Lebanon Junction area, much of Mt. Washington’s eastern edge. These add a pump tank and pressurized lateral distribution.
Mound and engineered systems run $13,000–$19,000+ for the steeper Salt River bluffs, lots with karst features, and any Knobs lot where soil depth is under 24 inches. The Bio-Microbics, Norweco, and Hoot aerobic units are common.
Drain field replacement — $6,000 to $18,000
Bullitt County’s older drain fields — many installed in 1980s and 1990s subdivisions around Shepherdsville and Hillview — are reaching end-of-life. A like-for-like replacement on the original footprint runs $6,000–$10,000. Where the original site can’t be reused, alternative-site work runs $11,000–$18,000.
Septic pumping — $300 to $575
A standard 1,000-gallon tank pump-out runs $300–$575 in Bullitt County, most homeowners paying around $425. The I-65 corridor has good pumper coverage; longer-haul jobs to Lebanon Junction and the rural southern county trend $50–$100 higher. Recommended interval: every 3–5 years.
Septic inspection for real estate — $295 to $575
A pre-sale inspection runs $295–$425 in Bullitt County. Load-tested inspections run $450–$575. Bullitt’s high real-estate turnover from Louisville-side buyer relocations makes inspections common; allow 7–14 days lead time during spring/summer.
Permits, fees, and the Bullitt County Health Department process
Bullitt County Health Department at 181 Lees Valley Road, Shepherdsville KY 40165 handles all on-site sewage permitting under Kentucky regulation 902 KAR 10:085. Call 502-955-7867 for the Environmental Health line specifically (the main BCHD number is 502-543-2415).
Standard process:
- Site evaluation. Required before any building permit. Fee: $250 for new construction site evaluation, $350 for farm evaluation. A BCHD environmental health specialist evaluates soil depth, perc, slope, water table.
- Sewage permit application. A certified Kentucky installer applies for the permit on behalf of the homeowner. Homeowners may apply directly if they intend to install the system themselves — Kentucky is one of the few states that allows owner-installs.
- Permit fee. $75 for an existing-system permit (modification). New construction permit fees vary; call BCHD for current numbers.
- Inspection. Required after installation, before backfill of the drain field trench, and before any building permit final.
Important: You must have a sewage permit before applying for a building permit in Bullitt County. Plan accordingly — building permits stall without it.
Owner-installs are permitted but must follow 902 KAR 10:085 design requirements and pass the BCHD final inspection. Most homeowners hire certified installers; the Kentucky Certified Installer (KCI) list is maintained by the Cabinet for Health and Family Services.
System types and what each costs locally
| System | When required | Bullitt County install range |
|---|---|---|
| Conventional gravity | Crider/Pembroke, perc < 60 min/in, slope < 15% | $5,200–$8,500 |
| Low-pressure pipe (LPP) | Soil 24–36”, Knobs transition | $9,000–$12,500 |
| Pressure-dosed conventional | Shallow soil, undulating | $10,000–$13,200 |
| Engineered conventional | Slope > 15%, Salt River bluffs | $11,500–$15,500 |
| Sand mound | Shallow rock (<24”), Knobs lots | $13,500–$18,500 |
| Aerobic (Bio-Microbics, Norweco) | Failed sites, small-lot repair | $13,000–$17,500 |
| Drip irrigation | Karst-adjacent, premium Louisville-side builds | $15,000–$19,000+ |
Common local issues homeowners face
- Knobs/Bluegrass dividing line. Lots straddling the I-65 corridor can have radically different soil profiles 200 yards apart. Always get a site evaluation before assuming neighbor’s system type will work for yours.
- Karst near Salt River. Sinkhole and solution-cavity features along the Salt River drainage south of Shepherdsville can void site evaluations. Request a karst-feature review for any lot south of Shepherdsville Road.
- Building permit dependency. Bullitt County will not issue a building permit without an approved sewage permit. New construction projects without this sequenced correctly can lose 6–10 weeks.
- Louisville-side relocation timing. Bullitt’s Louisville-relocation buyer market drives 12–14 week installer waitlists during spring peak. Lock in your installer before closing.
- Homeowner-installs and inspection. Kentucky allows homeowner-install, but the BCHD inspection is strict — failing the inspection means re-doing the work at full cost.
Frequently asked questions
How long does the permit process take in Bullitt County? Site evaluation: 2–4 weeks. Permit issuance: 1–3 weeks after a certified installer’s application. Total: 4–8 weeks if you have your installer lined up.
Can I install a septic system myself in Bullitt County? Yes — Kentucky allows owner-installs subject to BCHD site evaluation and inspection. Plan to study 902 KAR 10:085, hire a soil scientist for the perc test, and be ready for a strict final inspection. Most homeowners find hiring a Kentucky Certified Installer faster and cheaper after factoring in re-work risk.
What’s the difference between Bullitt and Jefferson County permitting? Bullitt operates its own health department permitting under state regulations. Jefferson County (Louisville Metro) has additional metro-level requirements and a different fee schedule. Permits are not transferable between the counties.
My building permit was held up — what happened? Almost certainly: your sewage permit wasn’t approved when you applied for the building permit. Bullitt County requires the sewage permit first; resolve at the BCHD office before re-applying.
My system is right next to a sinkhole — is this a problem? Probably yes. Kentucky requires setback from karst features, and active sinkholes can void the entire site. Get a BCHD site evaluation and consider a different drain field location.
Last reviewed 2026-05-29. Bullitt County Health Department Environmental Health: 502-955-7867 · 181 Lees Valley Rd, Shepherdsville KY. Main BCHD: 502-543-2415.
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