How Much Does It Cost to Replace a Septic Tank in Boston, MA? [2026 Data]

The cost to replace a septic tank in Boston, MA, is $6,498 on average, but can range anywhere from $5,415 to $12,996 depending on a handful of factors. Those include tank size or septic tank type, as well as factors related to the city’s higher cost of living, such as higher labor fees and greater material costs. 

Septic tanks are not uncommon in Boston, and odds are you’ll eventually have to replace one—whether you installed the original yourself or inherited it. You’ll have to hire a pro for installation, both for safety reasons and because of environmental regulations, but the good news is that there are plenty of septic companies in Boston, MA, ready and raring to take on the job. 

Here’s how much you can expect to pay for their work and everything involved.

Septic Tank Cost Factors 

Septic tank replacement costs in Boston, MA, are mostly determined by the tank’s size and material, such as concrete versus plastic septics. You don’t need to know how a septic system works to calculate a budget, but brushing up on the basics will give you a clearer idea of what to expect. Because it’s not just the tank you’re paying for, but the prepping of the land it will go into—and the hard work of the pros making it happen. 

Size

The septic tank size you need depends on the number of bedrooms your home has. For a three- or four-bedroom home, you’d need a 1,000-gallon septic tank, which costs $975 to $1,630 for the tank alone.

Larger houses have more sinks, toilets, bathtubs, and other wastewater sources that flow into the septic tank. As tank size increases, so do costs.

Septic Tank Material

Septic tanks are commonly made of plastic, concrete, or fiberglass, with fiberglass often being the most expensive. Here’s how much a tank costs based on its material.

Demolition, Prep, and Cleanup 

Replacing a septic system often involves excavation and clearing trees or roots. Since excavation can be a messy work, many homeowners add sod over their yards or even regrade their yards at the end of a septic tank replacement for a finished look.

Septic Tank Pro Costs

Septic pros in Boston, MA, charge between $85 to $200 per hour of labor, or roughly 50% to 70% of the total costs. Hiring a licensed septic company is a requirement for both new installations and the refurbishment of old ones in the state of Massachusetts, so you can forget about DIYing a project like this. 

A Title V permit is also mandatory for septic installations—these can cost anywhere from $100 to $1,200, but the license will be obtained by the pro that you hire, and they’ll typically calculate this into your final bill. 

When improperly installed or maintained, septic systems pose numerous risks to a home and its surrounding environment. Those range from minor to major—like a toilet that won’t flush, or a failed drainfield that puts not just you, but also local plants and wildlife in harm’s way. That’s the reason for the strict septic regulations, and why you’ll always be better off recruiting a team of experts to ensure they’re met.

Does Replacing a Septic Tank Increase Home Value?

If you have a septic system on your property, you’re obligated to have it inspected by a Massachusetts-certified inspector before you’re allowed to put it up for sale. So, while replacing a septic tank won’t boost your home’s value, taking care of it sooner rather than later might mean the difference between finding a buyer right out of the gate or not.

How Angi Gets Its Local Cost Data 

To help homeowners plan their next project, Angi provides readers with carefully researched cost data and upholds strict editorial standards. We start with national average project costs, which we collect by analyzing competitor information, retailer material costs, and input from professional contractors. We then apply local price index data to calculate location-specific estimates that reflect what homeowners typically pay in their local area. To do that, we use data from the U.S. Bureau of Economic Analysis (BEA), including its Regional Price Parities (RPPs), which measure price differences across cities. This helps us account for differences in labor, materials, and overall cost of living, so estimates in higher- or lower-cost areas better reflect real-world local pricing.

Every estimate undergoes a thorough editorial review to verify accuracy, consistency, and alignment with observed market conditions.

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