How much does a new septic system cost in Conroe?

A full conventional system for a three or four bedroom home typically runs $3,500 to $12,500 installed. Soil condition, drainfield size, and whether the county requires an engineered design set where you land in that range. We give a firm itemized number after a perc test.

Why is a tank replacement cheaper than a full system?

Replacing just the tank means we reuse a healthy drainfield, so the job usually falls between $3,500 and $8,500. A full system adds the distribution box and the entire absorption field, which is where a large share of the labor and gravel cost sits.

What makes an aerobic system cost so much more?

An aerobic treatment unit adds an aerator, pumps, controls, and a required maintenance contract, which is why NSF/ANSI Standard 40 systems run $10,000 to $20,000. We only recommend one when your soil or water table rules out a cheaper gravity drainfield.

How much does the perc test add to my budget?

A soil percolation test and site evaluation generally costs $750 to $1,900 depending on lot size and how many holes the county wants. It is money well spent, because it sets the drainfield size and prevents a far more expensive redesign later.

Does the permit cost come out of your estimate or on top?

We itemize the county health department permit and inspection fees as their own line, so you see exactly what goes to Montgomery County and what goes to the crew. Nothing is hidden inside a lump sum.

What size tank do I actually need, and does it change the price?

Tank size follows bedroom count. A three bedroom home usually calls for a 1,000 to 1,250 gallon tank, and a four bedroom home a 1,500 gallon unit. A larger tank costs a bit more, but sizing correctly protects the drainfield and your wallet down the road.

Can you match a lower quote I got from another contractor?

Send us the other estimate and we will read it line by line with you. Cheap septic bids often skip the perc test, undersize the drainfield, or leave out permit fees, and those shortcuts surface as repairs within a few years. We would rather show you where the numbers differ.

Do you offer any financing on a septic install?

Many homeowners spread the cost of a $3,500 to $12,500 project, and we can point you toward financing options during the estimate. We will lay out the total, the deposit, and the draw schedule in writing before any work begins.

How long does the whole job take once I approve the price?

From permit to backfill, a typical conventional install runs a few days of on site work once the county approval and perc results are in hand. Weather and inspection timing can shift the schedule, and we keep you posted at each step.

Conroe Septic Tank Contractors, Serving Willis

Name: Favoritegoodslosangeles
Address: 420 North Thompson Street, Conroe, TX, 77384, US
Telephone: (936) 976-4250

New tanks, drainfields, and aerobic systems installed across Conroe and Montgomery County. We lead with the number, then build it right. Free itemized estimates.

Call (936) 976-4250 Get an Itemized Estimate

Itemized written quotes
Perc test to backfill
Licensed and insured

Straight Talk Blog

Honest numbers and money saving tips for planning a realistic septic budget in the Conroe area.

Septic system installation budget planning in Conroe, TX

What a Septic System Really Costs in Conroe

July 1, 2026

Most septic quotes hand you one big number and hope you do not ask what is inside it. That is the wrong way to plan a project this size. If you are budgeting a new system anywhere around Conroe, here is where the money actually goes, so you can read any estimate line by line and spot the shortcuts before they cost you.

Start With the Perc Test, Not the Tank

Everything downstream depends on your soil. A percolation test and site evaluation runs about $750 to $1,900, and it sets the drainfield size the county will permit. Skipping it to save a few hundred dollars is the classic mistake, because an undersized field fails within a few years and the redo costs far more than the test ever would. Budget the perc test first and treat it as the foundation of the whole number.

The Tank Is the Smaller Line

People fixate on the tank, but it is rarely the biggest cost. A watertight 1,000 to 1,250 gallon concrete tank for a three bedroom home is a predictable expense. If you are only replacing a failed tank and your field is healthy, our septic tank replacement work usually lands between $3,500 and $8,500 total. The tank matters, but the field is where the real money sits.

The Drainfield Is Where Budgets Move

A conventional gravel or chamber drainfield is the line item that swings a quote the most. Good soil that drains fast keeps a full conventional system in the $3,500 to $12,500 range. Poor soil, a high water table, or a tight lot can force an aerobic unit or an engineered mound, and that pushes the total toward $10,000 to $20,000. This is exactly why the perc rate, not a guess over the phone, should drive your budget.

Do Not Forget Permits and Inspections

The Montgomery County health department permit and inspection fees are a real line, and an honest estimate shows them separately instead of burying them. Ask any contractor to itemize the permit cost. If they cannot, that is a sign the rest of the quote is soft too.

Compare Quotes on the Details

When two bids differ by thousands, the gap is almost always in the drainfield size, the tank material, or a skipped perc test. Read them side by side. The cheapest number on day one is often the most expensive by year five.

Want a real, itemized breakdown for your lot? Contact us or call Favoritegoodslosangeles at (936) 976-4250 for a straight talk septic estimate in the Conroe area.

Read the full article

Favoritegoodslosangeles provides septic tank installation in Conroe, TX, and we lead with the number most contractors bury on the last page: the price. Our crews handle new septic system installation, drainfield and leach field construction, aerobic treatment units, perc testing, tank replacement, distribution box repair, and engineered mound systems for lots a simple gravity field will not pass. We map the whole budget before a single trench opens along Longmire Road or out near Grand Central Park.

A full conventional system for a three or four bedroom home in Montgomery County usually lands between $3,500 and $12,500 installed. That spread is real, and it comes down to three things you can see before you sign. How fast your soil drains, how many bedrooms feed the tank, and whether the county clears a gravity drainfield or forces an engineered design. We walk each one with you so the estimate reads like a plan instead of a guess.

System type moves the price more than any other single factor. A watertight 1,000 to 1,250 gallon concrete tank feeding a conventional gravel trench is the value baseline. Poor soil, a high water table, or a tight lot can push you toward an aerobic treatment unit certified to NSF/ANSI Standard 40, and that jumps the total into the $10,000 to $20,000 range. We tell you which camp your property falls in during the perc test, not after the check clears.

We install across every Conroe ZIP, from 77301 near downtown out to 77384 and 77385 on the south side toward The Woodlands. Being local to Montgomery County means we already know how the health department reads a soil profile here and what setbacks apply near a private well. You get a licensed, insured crew, an itemized quote in writing, and one price that does not drift once the excavator arrives.

Cost first, alwaysWe hand you an itemized number up front so you know the drainfield, tank, and permit costs line by line.
We know the countyWe pull the permits and speak the health department's language for Montgomery County soil and setback rules.
Every system typeConventional gravity, aerobic (ATU), and engineered mound systems, sized to your lot and your perc rate.
Licensed and insuredA local, insured septic crew, glad to share our registration and current details on request.

Cost and Financing Questions

How much does a new septic system cost in Conroe?: A full conventional system for a three or four bedroom home typically runs $3,500 to $12,500 installed. Soil condition, drainfield size, and whether the county requires an engineered design set where you land in that range. We give a firm itemized number after a perc test.
Why is a tank replacement cheaper than a full system?: Replacing just the tank means we reuse a healthy drainfield, so the job usually falls between $3,500 and $8,500. A full system adds the distribution box and the entire absorption field, which is where a large share of the labor and gravel cost sits.
What makes an aerobic system cost so much more?: An aerobic treatment unit adds an aerator, pumps, controls, and a required maintenance contract, which is why NSF/ANSI Standard 40 systems run $10,000 to $20,000. We only recommend one when your soil or water table rules out a cheaper gravity drainfield.
How much does the perc test add to my budget?: A soil percolation test and site evaluation generally costs $750 to $1,900 depending on lot size and how many holes the county wants. It is money well spent, because it sets the drainfield size and prevents a far more expensive redesign later.
Does the permit cost come out of your estimate or on top?: We itemize the county health department permit and inspection fees as their own line, so you see exactly what goes to Montgomery County and what goes to the crew. Nothing is hidden inside a lump sum.
What size tank do I actually need, and does it change the price?: Tank size follows bedroom count. A three bedroom home usually calls for a 1,000 to 1,250 gallon tank, and a four bedroom home a 1,500 gallon unit. A larger tank costs a bit more, but sizing correctly protects the drainfield and your wallet down the road.
Can you match a lower quote I got from another contractor?: Send us the other estimate and we will read it line by line with you. Cheap septic bids often skip the perc test, undersize the drainfield, or leave out permit fees, and those shortcuts surface as repairs within a few years. We would rather show you where the numbers differ.
Do you offer any financing on a septic install?: Many homeowners spread the cost of a $3,500 to $12,500 project, and we can point you toward financing options during the estimate. We will lay out the total, the deposit, and the draw schedule in writing before any work begins.
How long does the whole job take once I approve the price?: From permit to backfill, a typical conventional install runs a few days of on site work once the county approval and perc results are in hand. Weather and inspection timing can shift the schedule, and we keep you posted at each step.

Services Included in Your Installation

One local crew for the tank, the drainfield, the permits, and everything in between.

New Septic System Installation

Full design and install of the tank, distribution box, and drainfield, sized from your bedroom count, so a three bedroom home gets a proper 1,000 to 1,250 gallon setup.

Septic Tank Replacement

We pull a cracked or failed tank and set a new watertight concrete, polyethylene, or fiberglass unit, most often a 1,000 to 1,500 gallon tank matched to the household.

Drainfield and Leach Field

Gravel trench or plastic chamber absorption fields sized from your perc rate so treated effluent disperses without surfacing or backing up into the yard.

Aerobic Treatment Unit (ATU)

Oxygen fed advanced systems certified to NSF/ANSI Standard 40 for tight lots or poor soil where a conventional gravity drainfield will not pass the county.

Perc Test and Site Evaluation

Soil percolation testing that measures drainage, confirms the seasonal water table, and sets the exact drainfield size the health department will permit.

D-Box Repair and Pumping

Distribution box resets that even out flow across laterals, plus routine tank pumping on the EPA recommended 3 to 5 year interval to protect the field.

Towns and ZIP Codes We Serve

We install and service septic systems throughout Conroe and the surrounding Montgomery County communities, from in town lots to the acreage out past the city limits.

Not sure if we reach your property? Call (936) 976-4250 and we will tell you straight.

Conroe, TX (77301, 77302, 77304)
Willis, TX
Montgomery, TX
The Woodlands, TX
Cut and Shoot, TX
Porter, TX

What You Will Pay for a New Septic System

Septic pricing comes down to two things: how much system your soil and household require, and whether the county will pass a simple gravity design. A tank swap is the lowest cost job, a full conventional system sits in the popular middle, and aerobic or mound systems for hard sites run highest. The ranges below are typical for the Conroe area, and we put the firm number in writing after a perc test and site evaluation.

Septic tank replacement$3,500 to $8,500 installed	Full conventional system$3,500 to $12,500 installed	Aerobic or mound system$10,000 to $20,000 installed
New 1,000 to 1,500 gallon tank Watertight concrete or poly Get estimate	Tank, D-box, and drainfield Sized from your perc rate Get estimate	NSF/ANSI Standard 40 ATU For poor soil or high water Get estimate

Get Your Itemized Septic Estimate

Ready for a real number? We will run the perc test, size the system to your soil and bedroom count, and hand you a written estimate with the tank, drainfield, and permit costs broken out. No lump sums, no surprises after the excavator shows up. Call and we will get you on the schedule for a site evaluation in the Conroe area.

Call (936) 976-4250