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What a Septic System Really Costs in Gregg County

A single average price for your town is the number that makes homeowners feel lied to when the first real quote arrives.

These are ranges we would expect to see quoted in East Texas, not a price list and not a quote. Nobody publishes real installed costs, including us, and anyone showing you a single average number for your town is describing a system that may not be the one your soil report calls for.

Installed cost ranges by system type A horizontal bar chart comparing typical installed cost ranges for each system type, with the low and high figures printed against every bar. Installed cost, low to high $0K $6K $11K $17K $22K PUMP-OUT ONLY $350–700 CONVENTIONAL INSTALL $6,500–11,000 AEROBIC (ATU) INSTALL ▶ MOST LOCAL LOTS $11,000–18,000 FULL REPLACEMENT $12,000–22,000
Ranges, not averages, and deliberately so. A single average number is the thing that makes a homeowner feel lied to when the first real quote arrives. Where your job lands inside these bars is decided by the soil report, the lot, and how far the excavator has to travel.

What decides the price in Gregg County

USDA soil survey data for Gregg County rate about 149,000 of its roughly 176,000 acres “very limited” for septic absorption fields and none “not limited”. The two most widespread reasons are slow water movement (about 145,000 acres) and a saturated zone close to the surface (about 83,000 acres).

Gregg County’s own fee is fixed and published: $350 for a single-family permit. Everything else on this page is the system, the design and the evaluation, which is where the range comes from.

County office: Gregg County Health Department, 405 East Marshall Avenue, Longview, TX 75601, (903) 237-2628.

Sources: USDA-NRCS Soil Data Access (SSURGO), septic tank absorption field ratings, queried 2026-10-23; Gregg County Health Department, OSSF permit checklist (2026); Gregg County: Septic Systems (program contact (903) 237-2628). Checked October 2026.

What else moves the number

How much trench you need

Slower soil needs more absorption area for the same house.

Bedrooms, not people

Sizing runs off bedroom count, because that is what the next owner will use.

Access, and what is already there

Awkward access is quietly expensive, and a replacement has to abandon the old system properly.

Running cost

A powered system adds electricity, consumables and a service schedule every year.

Before you compare two quotes

Check whether each includes the evaluation and design, the permit fee, electrical work, the initial maintenance agreement, reinstatement, and removal of the old system. A quote missing three of those is not cheaper. It is shorter.

Want real numbers for your actual lot?

A licensed site evaluator has to answer that with a soil test; nobody can tell from a map. Send us your address and we will pass it to a licensed local professional where one is available. Request a quote →

Last reviewed September 23, 2026 against Gregg County Health Department and the Texas Commission on Environmental Quality published rules. How we research this site.