Septic System Installation in Conroe, Texas
Licensed, bonded septic installers in Conroe and across Montgomery County. We handle the soil test, the county permit, and the full install.
Licensed & Bonded
Texas OSF installer
Permitted & Inspected
County health-dept approved
New Installs Only
Built right the first time
Free Estimates
No-obligation, on-site
Instant Estimate
Your Conroe septic estimate in 60 seconds
A few quick questions and you'll see your system size and a price range. No obligation, no contact info to start.
What are you installing a septic system for?
We specialize in new installs for homes on rural land.
Conroe & Montgomery County
New construction, manufactured & mobile homes
Out around Conroe, homes beyond the reach of city sewer run on their own septic system. We install new systems for new builds, manufactured homes, and mobile homes. We run the soil and perc testing, pull the Montgomery County permit, and build it to pass inspection the first time.
Get My Free EstimateConroe has been the Montgomery County seat since an 1889 election and sits on I-45 southeast of Lake Conroe. The city has its own sewer; around it, septic systems are permitted by Montgomery County, or by the San Jacinto River Authority near the lake.
Septic systems in Conroe
County government moved to Conroe after an 1889 election; Isaac Conroe's home served as the courthouse until the first one was built in 1891, and the present Art Deco courthouse was finished in 1936, during the Conroe oil boom. The city runs its own sewer and wastewater plant, and its code draws a sewer district around every main: property within 150 feet of a sewer main or lateral is in the district, and an occupied building there must connect within 30 days of the city's notice (Sec. 70-71). Each new subdivision within 500 feet of an existing city water or sewer main must connect to the city's systems unless that isn't technically feasible (Sec. 94-332). The city doesn't regulate subdivisions in its extraterritorial jurisdiction (Sec. 94-3), so lots there follow Montgomery County's rules. Outside the city, Montgomery County Environmental Health issues septic permits ($350 for a new home, or $480 in the floodplain, plus the $10 state fee), except within 2,075 feet of Lake Conroe, where the San Jacinto River Authority permits the system. The lake's nearest shore is about six miles northwest of City Hall.
Septic conditions around Conroe
We ran 35 spots within 5 miles of downtown Conroe through the same public data our free land check uses: the USDA soil survey, FEMA's flood maps and the National Wetlands Inventory. Here is what they show for a new septic system.
97%
33 of 34 spots
Soil the USDA rates "very limited" for a standard septic drainfield
100%
34 of 34 spots
Point to an aerobic system instead of a conventional drainfield
34%
12 of 35 spots
Inside a FEMA high-risk flood zone (the 100-year floodplain)
23%
8 of 35 spots
A mapped wetland within about 100 feet
Most of the ground around Conroe won't take a standard gravity drainfield: water moves through the soil too slowly and groundwater sits close to the surface in wet months. Plan on an aerobic system with spray or drip dispersal, from $11,950 installed. The two soil borings on your own lot make the final call. Prices cover the system and installation; the site evaluation, design and county permit are quoted separately.
12 of the 35 spots are in a FEMA high-risk flood zone. A lot there adds floodplain rules to the septic design and usually a county floodplain permit, so check your lot's zone early.
Most common soils around Conroe
| Soil | Spots | Drainfield rating | Main limitation |
|---|---|---|---|
| ConroeConroe loamy fine sand, 0 to 5 percent slopes | 9 | Very limited | High water table, Slow drainage |
| SplendoraSplendora fine sandy loam, 0 to 2 percent slopes | 6 | Very limited | High water table, Slow drainage |
| KamanKaman clay, 0 to 1 percent slopes, frequently flooded | 4 | Very limited | Flooding, High water table |
| BoyBoy loamy fine sand, 1 to 5 percent slopes | 3 | Very limited | High water table, Slow drainage |
| SegnoSegno fine sandy loam, 1 to 3 percent slopes | 3 | Very limited | Slow drainage |
9 more spots on 9 other soil types.
A map sample isn't your lot. The USDA soil survey maps the landscape at 1:24,000, and Texas requires a licensed site evaluator or engineer to evaluate every tract before a permit (30 TAC §285.30). Run your own address through the free land check to see what the maps show for your lot.
Check my land freeSources: USDA NRCS Soil Survey (SSURGO), FEMA National Flood Hazard Layer, USFWS National Wetlands Inventory. 35 spots on a 1.6-mile grid, checked October 2, 2026.
What we install in Conroe
Site Evaluation & Perc Testing
We evaluate your soil and run the percolation test that determines how well your ground absorbs water — the foundation of a system that works.
System Design & Sizing
We size the tank and drainfield to your home's bedroom count and your soil's absorption rate, then engineer a layout that fits your lot.
Permitting & County Approval
We prepare and submit your on-site sewage facility (OSF) permit application and coordinate approvals with your county health department.
Excavation & Site Prep
We prepare the site and excavate for the tank and drainfield with the right grade and setbacks — protecting your wells, structures, and property lines.
Tank Installation
We set the septic tank, connect the inlet and outlet plumbing at the correct grade, and install the effluent filter and risers for easy future access.
Drainfield Installation
We install the drainfield (leach field) that disperses treated effluent safely into the soil, sized to your percolation results and available area.
Built for Montgomery County soils
Advanced aerobic treatment systems
The USDA soil survey rates most of the ground around Conroe "very limited" for a standard drainfield: it drains too slowly, holds a high water table part of the year, or both. On lots like that a standard gravity drainfield won't pass, so you'll need an aerobic system with drip or spray dispersal. We don't guess at it — the on-site soil test tells us exactly what your lot can take.
We handle Montgomery County permitting for Conroe
Septic permits around Conroe are issued locally, usually by Montgomery County. We put the application together, turn in the soil and design paperwork, and stay on it through approval and the final inspection — so you're not the one chasing the permit office.
New to septic? Our guides cover the basics: How Much Does It Cost to Install a Septic System in Texas? (2026) · What Size Septic Tank Do I Need? · What Is a Perc Test (and Why Does It Matter)?
Local OSSF permitting authority: Montgomery County Environmental Health Services
Typical county permit fee: About $350–$480 (county fees change — we confirm the current amount during permitting)
Permit steps, fees and FAQs for Montgomery CountyWhy Conroe homeowners choose us
Licensed & Bonded
Move forward knowing your project is handled by a licensed, bonded installer.
New Construction & Mobile Home Specialists
We install new systems for new construction, manufactured, and mobile homes — so we're fast, precise, and up to date on the rules.
We Handle the Permits
Soil testing, design documentation, and county OSF approval — all managed for you.
Honest, Upfront Estimates
Clear, itemized quotes after we evaluate your site. No pressure, no surprises.
Local & Dependable
We know your county's requirements and show up when we say we will.
Built to Last
Properly sized, properly installed, and restored clean — a system you can forget about.
How your Conroe install works
Instant estimate
Get a ballpark price for your Conroe project online in about a minute.
Free on-site evaluation
We test your soil and confirm the right system for your lot.
Permit & design
We handle the Montgomery County OSSF permit end to end.
Install & inspection
Professional installation and final county sign-off.
What homeowners say
"Quick flow septic was a great experience!! Honest, good prices, and quick to respond to customer’s questions and concerns. Alex and his team will do everything to make it right. Would definitely recommend. 10/10"
"They handled our soil test, permit, and full septic install for our new build. The process was clear, the crew stayed on schedule, and the county inspection passed the first time."
The Ramirez Family
Montgomery County, TX
"We needed septic for our manufactured home and they took care of everything from design to approval. Clear pricing, good communication, and no surprises."
Carlos & Elena Martinez
Waller County, TX
"Our property was raw land and we did not know where to start. They sized the system, handled the county paperwork, and kept the project moving."
The Johnson Family
Liberty County, TX
"Responsive, professional, and familiar with the local requirements. They made the permit and installation process much easier than we expected."
Miguel Hernandez
Fort Bend County, TX
Conroe septic questions
Do I have to connect to Conroe city sewer?
If your property is within 150 feet of a city sewer main or lateral, it's in the city's sewer district, and an occupied building there must connect within 30 days of the city's notice (Sec. 70-71). New subdivisions within 500 feet of an existing city water or sewer main must also connect, unless it isn't technically feasible (Sec. 94-332).
Does Conroe regulate septic lots in its extraterritorial jurisdiction?
Not through subdivision rules: Conroe's subdivision chapter applies only inside the city limits, and the city says it doesn't regulate the subdivision of property in its extraterritorial jurisdiction (Sec. 94-3). A septic system there is permitted by Montgomery County, or by the San Jacinto River Authority if it sits within 2,075 feet of Lake Conroe.
How close to a Conroe city well can a septic system go?
Not within 150 feet. Conroe's code bars septic tanks, drainfields, absorption beds and low-angle spray areas within a 150-foot radius of the city's public water wells, and septic tanks specifically within 50 feet (Sec. 26-152). It's one of the setbacks we check when a lot is near a city well site.
Will I need an aerobic septic system in Conroe?
Probably. Of the 34 spots we checked within 5 miles of downtown Conroe, 34 point to an aerobic system, mainly because water moves through the soil too slowly and groundwater sits close to the surface in wet months. Aerobic systems start at $11,950 installed (the site evaluation, design and permit are quoted separately). The two soil borings on your lot make the final call.
Is Conroe in a flood zone?
Parts of the area are. 12 of the 35 spots we checked within 5 miles of downtown Conroe are inside a FEMA Special Flood Hazard Area (the 100-year floodplain), including 6 in the regulatory floodway. Your own lot's zone is what counts, so run the address through our free land check before you buy or design.
Do you install septic systems in Conroe?
Yes. We install new septic systems on land in and around Conroe and across Montgomery County — for new construction, manufactured homes, and mobile homes. Inside city limits that have city sewer, you'll usually connect to the sewer instead.
How much does a septic system cost in Conroe?
Most Conroe installs run between $8,000 and $13,950 — $8,000 for a conventional system where the soil allows it, $11,950 for an aerobic spray system, and $13,950 for an aerobic system with drip dispersal. The soil evaluation (perc test), the engineered design, and the county permit are quoted separately. Run the instant estimate for a ballpark, and we'll confirm the exact number once we've seen the lot.
Do I need a permit for a septic system in Conroe?
Yes. Every new septic system needs a permit and a soil evaluation before anyone digs. Around Conroe the permit usually comes from Montgomery County, and we take care of all of it for you.
Check your Conroe lot before you buy or build
Soil rating, flood zone, wetlands, and the likely septic system type for any Conroe address — free, in seconds.
Get your free Conroe septic estimate
Tell us a little about your Conroe property and we'll size your system and set up a free visit. No pressure, no obligation.