How to Compare Septic Quotes: 15-Line Checklist and Red Flags

What should a septic installation quote include?

A septic quote should include every piece of work needed to get a permitted, working system and a signed-off final inspection, with each piece priced or clearly marked as excluded. If it doesn't, you can't compare it to anything, because you don't know what you're buying.^source

Here are the 15 lines to look for. Not every quote will break out every line with its own price, and that's fine. What matters is that each one is either included, excluded in writing, or given as an allowance you can check.

Quotes written before the soil evaluation are estimates

A quote written before the soil and site evaluation is a planning estimate, not a price. The evaluation decides which system types can be permitted on your lot and how much disposal area the design needs, and those two things drive most of the cost.^source

In Kaufman County that usually means aerobic. The Blackland Prairie clay across most of the county is Texas soil Class IV, which the rules call unsuitable for standard trenches. If one installer quoted conventional at $6,000-$10,000 and another quoted aerobic at $12,000-$18,000, the gap probably isn't pricing. It's an assumption about your soil that only the evaluation can settle.^source

Ask every installer to write down what they assumed about soil, system type, and field size. When the evaluation comes back, ask them to revise to the actual design. Our soil and site evaluation guide explains what the evaluator is looking for.^source

How to compare two septic bids side by side

To compare septic bids, rebuild each one to the same scope, then compare the totals. Take each line from the checklist, mark it included or excluded, and put a number on everything excluded.

Here's an illustration using made-up but realistic bids for a 3-bedroom aerobic system on a 2-acre lot near Crandall. Bid A looks $2,500 cheaper. Once the missing items are added at site planning ranges and example figures, the gap mostly disappears.

Red flags in a septic quote

A low bid isn't a red flag by itself. It becomes one when the quote avoids the parts that usually move cost: soil, permit, field size, electrical, and maintenance. These are the patterns worth pushing back on.^source

• It just says "aerobic system installed" with no model, capacity, or spray area.
• The permit and soil evaluation are missing, and nobody says who is handling them.^source
• It quotes a conventional system before any soil evaluation on a clay lot.^source
• It asks for a large payment up front. TCEQ specifically advises against paying large sums at the start.
• It offers to skip the permit or suggests you apply as the owner so the installer doesn't have to.^source
• The installer can't give you a TCEQ license number, or the name on the license doesn't match who will be on site.^source
• Electrical is not mentioned at all.
• There's no written warranty on parts or labor.
• It's verbal, or a one-line text message with a total.

Questions to ask every septic installer

The best way to compare installers is to ask each one the same questions and write down the answers. You'll learn more from how they answer than from the number at the bottom.

Keep the answers with your quotes. If a question makes an installer irritated, that's useful information too.

• What is your TCEQ installer license number, and who will actually be on the job?^source
• What system, treatment unit model, and gallons-per-day rating are you quoting, and why?
• How many square feet of spray or drip area does this include, and where will it go?
• Who files the permit with Kaufman County Development Services (or Terrell or Oak Ridge), and is the fee included?^source
• What happens to the price if the soil evaluation calls for a bigger field or a different system?^source
• Is the two-year initial service policy included, and what will the contract cost after that?
• Who runs power to the panel and aerator, and how far did you assume?
• What's your warranty on parts and labor, and what does the manufacturer cover?
• What's the payment schedule, and is final payment due after the county's final inspection?
• How long from permit approval to a working system, given weather and your schedule?^source

How many septic quotes should you get?

Get three quotes for a new system or a full replacement. That's TCEQ's own advice to owners: if all three are close, you have a good bid. If two are close and one isn't, ask the odd one out what they're missing or adding. If all three are far apart, get new estimates.

For a single-part repair, one or two quotes is usually enough, especially when the problem is clear and the system is already on a maintenance contract. Waiting a week for a third quote on a dead aerator costs you more in hassle than it saves.^source

Payment terms, deposits, and trust accounts

A fair payment schedule ties money to progress: a modest deposit, a payment when the system is installed, and the balance after the permitting authority approves the final inspection. TCEQ advises owners not to pay large sums up front.^source

TCEQ also points owners to Texas Property Code 162.006, which requires a construction trust account for money paid under a written contract over $5,000. Nearly every new septic system clears that line. Ask the installer how they handle trust funds, and get the contract in writing.

If you're financing the system, make sure the lender's draw schedule lines up with the installer's payment schedule before you sign either one. Our guide to paying for a septic system in Texas covers the loan side.

Replacement quotes have extra lines

A replacement quote needs everything a new-construction quote does, plus the cost of dealing with the old system and working around a finished yard. That's part of why aerobic replacement plans at $12,000-$20,000, a bit above a new build.

Look for these added lines: how the old tanks will be pumped and abandoned or removed, access for equipment past fences and driveways, damage to existing landscaping, any temporary arrangements while the house is without a working system, and the permit for the new system (the site plans $200-$550 for replacement permitting). Our septic system replacement page covers when replacement is actually needed.^source

Check the license before you compare prices

Before comparing prices, confirm the installer holds a current TCEQ license. Kaufman County requires a TCEQ license to install or repair any portion of a septic system, sprinklers included, and bans owner installation without one. An unlicensed bid isn't a cheaper option. It's a system that can't be legally permitted.^source

TCEQ licenses individuals, not companies, so ask whose license covers the job. Our septic license guide explains the different license types and how to look one up.^source

When the quote is ready to sign

A quote is ready to sign when you could hand it to a stranger and they could tell you exactly what system you're getting, where it goes, what's excluded, and when you pay. If it doesn't pass that test, send it back with your questions.

Once you have comparable bids, the septic system installation page explains the local install process, and the Kaufman County septic cost guide shows whether your numbers are in the normal range.