Cost to Install a Septic System in Baltimore [2025 Data]
Septic system installation costs between $3,502 and $8,137 in Baltimore, Maryland, with an average of $5,820. Your septic pro will consider the system type, size, and location for a personalized quote.
Conventional concrete septic systems are the most common in the Baltimore area.
Baltimore requires a minimum 1,500-gallon septic tank for new homes.
Certain coastal areas must install a Best Available Technology (BAT) unit, which adds to costs.
Septic system contractors must be licensed by the Maryland State Board of On-Site Wastewater Professionals.
The cost to install a septic system in Baltimore is $5,820 on average, with most homeowners spending between $3,502 and $8,137. Despite the fact that it’s Maryland’s largest city, it happens to be one of the most affordable major cities for homeowners in the country—and that cost savings includes things like upgrading your septic system.
Septic systems in Baltimore are uncommon since most of the city is serviced by two large wastewater treatment plants. You will start finding more of them once you head toward the suburbs. Maryland itself is home to around 420,000 septic systems, so they’re no anomaly. Here’s how the price of a septic system works out.
Septic System Installation Cost Factors
Baltimore is a major port, and when you’re dealing with potential pollution (like wastewater) and waterways, there are going to be regulations. These regulations impact the price because they dictate everything about your septic system build—like the tank size, system type, and land prep costs.
Tank Size
The septic tank size you need will depend on local regulations and the number of bedrooms your home has. For a four-bedroom home, you’d need a 1,250-gallon septic tank, which costs $1,200 to $3,000 for just the tank. If you’re located in Baltimore County, the minimum capacity allowed for septic tanks serving new homes is 1,500 gallons.
While small septic tanks cost less, larger houses have more sinks, toilets, bathtubs, and other wastewater sources that flow into the septic tank. They’ll need a larger tank, and as tank size increases, so do costs.
| Tank Size (Gallons) | Number of Bedrooms | Average Cost Range |
|---|---|---|
| 1,000 | Up to 3 | $900–$1,500 |
| 1,250 | 4 | $1,200–$3,000 |
| 1,500 | 5 | $1,500–$4,000 |
| 2,000 | 6 or more | $2,000–$5,000 |
Materials
Septic tanks are commonly made of plastic, concrete, or fiberglass, with fiberglass being the most expensive. Here’s how much a tank costs based on each material.
| Material | Average Cost (Tank Only) | Pros | Cons |
|---|---|---|---|
| Concrete | $700–$4,000 | The standard in Maryland, highly durable and has the longest lifespan | Prone to cracks |
| Plastic | $800–$2,500 | Easy to install and budget-friendly | Least durable |
| Fiberglass | $1,500–$5,000 | Common concrete alternative, easy to install, and resists cracking and algae growth | Most expensive |
Type of Septic System
Each type of septic system comes with its own set of pros and cons. While anaerobic systems are relatively low-maintenance, they aren’t great for small properties. Similarly, aerobic systems can do well in small spaces but require extra work.
| Anaerobic | Aerobic |
|---|---|
| Anaerobic bacteria break down waste | Aerobic bacteria break down waste |
| More affordable | More expensive |
| Uses fewer chemicals | More efficient |
| Needs a larger leach field | Good for smaller properties |
Anaerobic: Anaerobic systems are more common and cost $3,000–$8,000. They’re less costly than aerobic systems and don’t need extra power or chemicals, but they’re less efficient and require a larger leach field. A pipe runs from the house to the septic tank, where another pipe runs into the leach field. Anaerobic bacteria break down solid waste before the system distributes the wastewater into the soil.
Aerobic: Aerobic septic systems utilize oxygen pumped into the tank to activate bacteria that feed on the solid waste. They’re more expensive at $10,000–$20,000 but are more efficient and work well on smaller properties. They require additional power to run, so hook yours up to a power generator in case of a power outage. Otherwise, these systems can plug into your property’s main power source.
Alternative: An alternative septic system can cost upward of $20,000. Most homes in Maryland use conventional systems, but there are some cases where you may need an alternative system. For example, mound systems are a good workaround for challenging soil conditions and areas with high groundwater. In Maryland, homeowners within 1,000 feet of tidal waters in the Chesapeake Bay or Atlantic Coastal Bays Critical Area must install a Best Available Technology (BAT) unit, a type of multichambered pretreatment system that enhances nitrogen removal in wastewater.
Site Prep
To meet the septic tank requirements set by the city of Baltimore and the state of Maryland, you’ll need to survey, test, and prep the site for septic tank installation. Site prep costs include:
Land Survey: You’ll need to get a land survey before installing a septic system to ensure your plans fall within property lines. Expect to spend $330–$900 to hire a licensed land surveyor.
Percolation Test: Before the installation, you need a local perc test pro to perform a percolation test. The test measures water drainage in the soil, soil type, and the height of each sediment layer on your property to determine the best type of septic system for you. The cost to test your soil is $700–$2,000.
Leach Field Installation: Septic tank systems consist of a septic tank and a trench referred to as a leach field or drain field. This section of the system transports the wastewater back to the soil. Drain field installation costs $5,000–$12,000, and includes excavation and land regrading.
Septic System Installation Pro Costs
A septic tank pro in Baltimore, Maryland, can help you navigate the strict regulations around this project—this is essential in coastal areas of the city, where you need to reduce potential pollutants. Here’s how labor-related costs break down.
Labor
Labor accounts for 50% to 70% of the cost of septic tank installation. In Baltimore County, you can hire a master plumber or sewage disposal contractor to handle septic problems and install a new system. Whichever contractor you choose must be licensed with the Maryland State Board of On-Site Wastewater Professionals.
Permits
You’ll need a permit before you can install a septic tank, but Baltimore County may have different regulations from the surrounding areas. For example, the requirement of BAT systems in designated critical areas.
The cost of a permit in Baltimore is not straightforward and depends on the scope of the project. Your permit costs could include:
Septic tank permit: minimum of $100
Excavation permit: $35–$75
Electrical work permit: $25–$200
The required inspections would be an additional charge.
Does a Septic System Increase Home Value?
A septic system will not significantly increase or decrease home value. It’s neutral—either your home is set up to be part of the municipal sewer system or it isn’t. The only time a septic system will impact value is if it’s damaged, leaking, or nearing the end of its lifespan.
To maintain your property value, repair or replace aging and damaged systems. The average septic tank repair costs $650 to $3,050, which is close to the cost of a new septic system in Baltimore. In many cases, a replacement is the best overall value, but a local septic tank company can help you weigh your options.
Pumping your septic tank every three to five years is one of the most important septic maintenance tasks. When you combine that with flushing only approved items (toilet paper and waste) and avoiding driving over your drain field, you have a recipe for a long-lasting septic system.
How Angi Gets Its Cost Data
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
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