Septic Services in Lewisville, TX

Lewisville-area septic pumping costs $275-$400 for a 1,000-gallon tank, averaging $350. Lake proximity, Denton County permitting, and clay soils affect service costs and system performance.

Lewisville sits in the heart of the DFW metroplex along the southern shore of Lake Lewisville, a 23,280-acre reservoir that supplies drinking water to much of the region. The city itself runs on municipal sewer for most neighborhoods, but properties in unincorporated Denton County pockets, older areas near the lake, and nearby communities like Hickory Creek, Lake Dallas, and parts of Flower Mound still rely on septic systems. That lake proximity creates a wrinkle you won't find in most DFW suburbs: stricter setback rules, higher water tables near the shoreline, and additional oversight from the U.S. Army Corps of Engineers on top of standard Denton County permitting.

The soil around Lewisville sits in a transition zone between two very different regions, with heavy Blackland Prairie clay on the eastern side and sandier Cross Timbers soils to the west toward Flower Mound and Highland Village. That split affects everything from system design to drain field performance to long-term maintenance costs. As Dr. Bruce Lesikar, P.E., a former Texas A&M University professor who researched on-site wastewater treatment under various soil and water table conditions, has noted, understanding your local soil and water table is the first step to keeping a septic system working properly.

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What Septic Services Are Available in Lewisville?

Lewisville-area providers offer pumping ($275-$400), repair ($200-$7,000+), inspections ($200-$500), and aerobic maintenance ($275-$450/year).

The Lewisville area's mix of lakeside properties, older rural lots, and rapidly expanding suburbs creates demand for the full range of septic services. Whether you're maintaining a 30-year-old conventional system near the lake or keeping up with TCEQ requirements on a newer aerobic unit, here's what's available.

Septic Pumping

Routine pumping removes accumulated sludge and scum before solids push into the drain field. Most Lewisville-area households need pumping every 3-5 years. Properties on heavy clay near the lake should lean toward pumping every 2-3 years, since the clay drains slowly and puts extra strain on drain fields. Households with four or more people or garbage disposals should also pump more often.

Septic Repair

Lake Lewisville's fluctuating water table and the area's expansive clay soils are tough on systems. Seasonal water level changes can saturate drain fields, and the constant shrink-swell cycle of Blackland Prairie clay cracks concrete tanks and breaks distribution lines. Common repairs include drain field line replacement ($3,000-$7,000), cracked tank repair ($1,500-$3,500), and clearing clogged baffles ($200-$500). Properties near the lake with shallow water tables may need drain field re-engineering or conversion to alternative disposal methods like drip irrigation.

Septic Inspection

Buying or selling a Lewisville-area home on septic? Get it inspected. Most lenders require one even though Texas doesn't mandate them statewide. A full inspection runs $200-$500 and covers tank integrity, drain field performance, baffles, and distribution lines. Properties near Lake Lewisville deserve extra scrutiny because of water table issues. Combined pumping-and-inspection packages ($425-$625) give you the most complete picture.

Aerobic System Maintenance

Aerobic systems are common throughout the Lewisville area because conventional gravity drain fields struggle in the heavy clay and high water table conditions near the lake. TCEQ requires a maintenance contract for the life of any aerobic system, with inspections every four months. North Texas summer heat stresses aerobic components, and lake-area moisture adds another layer of wear. Plan on $275-$450 per year for a maintenance contract.

What Local Factors Affect Septic Systems in Lewisville?

Lake Lewisville's fluctuating water table, the clay-to-sandy-loam soil transition, and layered federal/county permitting all shape how septic systems perform here.

Lake Lewisville and Water Table Impact

Lake Lewisville is classified as a public water supply reservoir under TCEQ rules (Segment 0823 in the Trinity River Basin), which means properties near the lake face stricter septic standards than you'd see elsewhere in DFW. The lake's conservation pool sits at 522 feet mean sea level, but flood events can push water levels toward the spillway crest at 532 feet. That 10-foot swing has a real impact on groundwater levels along the shoreline.

When the water table rises, septic drain fields can become saturated. Groundwater can actually flow backward into the tank through inlet and outlet pipes, preventing the system from treating wastewater properly. Properties within a quarter-mile of the shoreline are most vulnerable, especially during spring rainy seasons when the lake level climbs and the clay soil holds moisture instead of draining it.

The U.S. Army Corps of Engineers, which manages Lewisville Dam, controls a flowage easement that extends to 537 feet elevation. Properties within this easement face additional restrictions. You can't install a septic system within 75 feet of the lake water surface measured at the spillway elevation, and any installation on flowage easement land requires written approval from the District Engineer on top of your standard Denton County permit. TCEQ's own rules require septic tanks to be at least 50 feet from any lake's normal pool elevation, and soil absorption systems need at least 75 feet of separation. If your property borders the lake, plan for a more involved and more expensive permitting process.

Blackland Prairie to Cross Timbers Transition

Lewisville sits right where two distinct soil regions meet, and knowing which side of that line your property falls on matters for your septic system.

The eastern side of Lewisville, toward Carrollton and The Colony, sits on Blackland Prairie clay. This heavy, dark clay (classified as vertisols) swells when wet and shrinks into deep cracks during drought. It drains poorly, often under 1 inch per hour, which means conventional gravity drain fields saturate quickly. Most properties on this soil type need aerobic treatment units or low-pressure dosing systems. Interestingly, the Lewisville soil series, a well-drained, moderately permeable soil that formed in ancient calcareous sediments, runs along major streams in the area and offers better drainage than the surrounding clay, but it covers limited ground.

West of I-35, toward Flower Mound and Highland Village, the soil transitions to Cross Timbers sandy loam. Drainage is better here, and conventional gravity septic systems can work well in this soil. If you're buying property and plan to install a septic system, this soil distinction could save you thousands in system design costs.

Lewisville-Area Septic Regulations

Denton County Environmental Health Division is the TCEQ-authorized agent for septic permits in unincorporated areas around Lewisville. They handle design review, permit issuance, final construction inspections, and enforcement. Their office is at 3900 Morse Street, Denton, TX 76208 (940-349-2920).

Key requirements:

• All installations, repairs, and modifications need a permit from Denton County Environmental Health. The permit fee is $310 for new systems and $100 for repairs.
• Site evaluation and soil analysis must be performed by a licensed Professional Engineer (PE), Registered Sanitarian (RS), or TCEQ-licensed Site Evaluator before any work begins.
• Final inspection is mandatory. Tanks must be in place (unbackfilled), filled with water, drain fields constructed, and the house line connected before the county signs off.
• Deed recording is required. Denton County requires property owners to file a deed recording notifying the public that an on-site sewage facility exists on the property.
• Within Lewisville city limits, the City of Lewisville handles permitting instead of the county. The city only allows septic if your property can't connect to municipal sewer.
• Lake-area properties may need additional approval from the U.S. Army Corps of Engineers if they fall within the flowage easement (at or below the 537-foot elevation contour).

Per TCEQ rules (Texas Health and Safety Code Section 366.0515), aerobic systems require a maintenance contract for the life of the system with inspections every four months. Denton County enforces this, and property owners must submit a copy of the contract at least 30 days before the previous contract expires.

TCEQ is also updating statewide septic rules (30 TAC Chapter 285), with changes expected in 2026 that may affect design and inspection standards.

How Much Do Septic Services Cost in Lewisville, TX?

Most Lewisville-area homeowners pay $275-$400 for standard septic pumping, with the average around $350 for a 1,000-gallon tank.

Service	Lewisville Price Range
Standard pumping (1,000 gal)	$275 - $400
Large tank (1,500+ gal)	$375 - $575
Pumping + inspection	$425 - $625
Emergency/after-hours	$450 - $725
Locating buried tank lid	+$75 - $150
Aerobic maintenance (annual)	$275 - $450

Lewisville-area prices reflect DFW metro rates, which run slightly higher than statewide averages due to urban demand and traffic logistics. Properties near Lake Lewisville sometimes cost more because of tight access, shallow water tables that complicate pumping, and the extra documentation lake-area permits require. Homes on heavy clay with buried lids also push toward the higher end.

Routine pumping at $275-$400 is a small price compared to a $3,000-$15,000 drain field replacement if neglect leads to failure. According to the EPA, more than one in five U.S. households relies on a septic system, and regular maintenance is the most cost-effective way to protect your investment.

Prices based on February 2026 provider surveys and market data for the Lewisville area. Your actual cost depends on tank size, accessibility, and system condition.

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How Do You Get a Lewisville Septic Quote?

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Why Should You Hire a Local Lewisville Septic Pro?

Local providers know Lake Lewisville's water table risks, Denton County's permitting process, and which soil type your neighborhood sits on.

• They understand Lake Lewisville's impact. A local provider knows how lake levels, water table fluctuations, and Corps of Engineers rules affect your system, especially if your property sits near the shoreline.
• Denton County permit experience. Denton County has its own permitting process separate from Dallas, Collin, or Tarrant counties. A local pro navigates the Denton County Environmental Health office and the city's requirements without delays.
• Soil transition zone knowledge. Lewisville's split between Blackland Prairie clay and Cross Timbers sandy loam means system design and maintenance vary by neighborhood. A local company knows which side of the line your property sits on.
• Faster emergency response. Local companies can often respond same-day, which matters when sewage is backing up or lake-area flooding is stressing your system.

Serving Lewisville and Surrounding Areas

We connect homeowners with septic professionals throughout the Lewisville area, including:

• Flower Mound
• Highland Village
• The Colony
• Carrollton
• Coppell
• Denton
• Corinth
• Lake Dallas
• Hickory Creek
• Frisco
• Grapevine
• Argyle

Frequently Asked Questions About Septic Services in Lewisville

How much does septic pumping cost in Lewisville?

Standard septic pumping in the Lewisville area costs $275-$400 for a 1,000-gallon tank, with most homeowners paying around $350. Larger 1,500-gallon tanks run $375-$575. Emergency and after-hours service adds $150-$325 to the base price. Properties near Lake Lewisville with tight access or shallow water tables may cost more due to extra labor and equipment requirements.

How often should I pump my septic tank in Lewisville?

Most Lewisville-area homes need pumping every 3-5 years, but properties on heavy clay or near the lake should pump every 2-3 years. TCEQ recommends pumping conventional systems every 3-5 years to prevent short-circuiting the treatment process. The Blackland Prairie clay that covers much of the area drains slowly, which puts extra load on your drain field. Households with four or more people, garbage disposals, or heavy water use should pump more frequently. If you notice slow drains or soggy spots in the yard, don't wait for the scheduled interval.

Does living near Lake Lewisville affect my septic system?

Yes. Lake Lewisville is a public water supply reservoir, and properties near the lake face stricter setback requirements, higher treatment standards, and potential water table issues. TCEQ requires septic tanks to sit at least 50 feet from the lake's normal pool elevation, and drain fields need at least 75 feet of separation. Properties within the Army Corps of Engineers flowage easement (at or below the 537-foot elevation) need additional federal approval. Rising lake levels during wet seasons can also saturate your drain field, reducing treatment effectiveness and potentially causing backups.

Who handles septic permits in the Lewisville area?

Denton County Environmental Health Division is the TCEQ-authorized agent for septic permits in unincorporated areas around Lewisville. They review system designs, issue permits ($310 for new systems, $100 for repairs), and perform final inspections. Within Lewisville city limits, the City of Lewisville handles permitting instead. All installations and repairs beyond routine pumping require a permit and must be done by a TCEQ-licensed installer. Lake-area properties may also need written approval from the U.S. Army Corps of Engineers.

Why are aerobic systems so common in the Lewisville area?

Heavy clay soils and high water tables near Lake Lewisville make conventional gravity drain fields unreliable across much of the area. Blackland Prairie clay drains under 1 inch per hour, and properties near the lake deal with fluctuating groundwater that can saturate drain fields seasonally. Aerobic systems treat wastewater to a higher standard before it reaches the soil, which means they work in conditions where conventional systems would fail. Per TCEQ rules (30 TAC Chapter 285), aerobic systems require a maintenance contract with inspections every four months, adding $275-$450 per year to your costs.

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Last updated: February 9, 2026 Pricing based on Lewisville-area provider surveys and market data Sources: Denton County Environmental Health, TCEQ, U.S. Army Corps of Engineers Fort Worth District, City of Lewisville, Texas A&M AgriLife Extension, EPA