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  • Average homeowner rating star icon4.4
    Average homeowner rating
  • Verified reviews icon25
    Verified septic tank services reviews

Top-Rated Septic tank pros in Manhattan - Updated Nov 2026

Avatar for Welk Excavating, Inc.
Welk Excavating, Inc.
New to Angi
Septic System - RepairSeptic System - Install or ReplaceSeptic System - Install or Replace - For Business+1 more

Serving Manhattan, MT and surrounding areas

Approved

In business since 2020

Free estimates

Small jobs welcome

Excavation Contractor with over 10 years experience- in both commercial and residential projects Family run and operated business. \n \n Welk Excavation is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

Road
Parking Area
Response time2 days
6 neighbors recently requested a quote
Avatar for CS Earthworks LLC
CS Earthworks LLC
5.0(
3
)
Septic System - Install or ReplaceSeptic System - Install or Replace - For Business

Serving Manhattan, MT and surrounding areas

In business since 2019

Free estimates

Offers commercial services

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

Response time40 mins
Recommended by66%of homeowners
Avatar for Simple Works
Simple Works
4.3(
16
)
Septic System - Install or ReplaceSeptic System - Install or Replace - For BusinessSeptic System - Repair+3 more

Serving Manhattan, MT and surrounding areas

In business since 2014

Free estimates

Credit card accepted

I'm Peter Harris and I am the owner/proprietor of Simple Works here in the Gallatin Valley. I specialize in home renovation with emphasis in kitchen and bathroom reworks. Simple Works does both home and commercial remodeling, small scale and large. I work with other business owners around the valley who, combined with my skill set, can get any job done! I enjoy meeting people and making their vision come to life through the renovation work Simple Works does. Call or email to get your project started today!

Recommended by85%of homeowners
Avatar for 406 Septic Service
406 Septic Service
3.0(
2
)
Septic System - Install or ReplaceSeptic System - Install or Replace - For BusinessSeptic System - Repair+1 more

Serving Manhattan, MT and surrounding areas

In business since 2017

Free estimates

Emergency services offered

We take great pride our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

Cleaned Filter
Inlet and Outlet Risers
Checked overall system functionality
Response time3 hrs
Recommended by100%of homeowners
Troy's Excavation Service, LLC
New to Angi
Septic System - Install or Replace

Serving Manhattan, MT and surrounding areas

In business since 2004

Free estimates

Troy's Excavation Service, LLC, can help you out with any of your outside the house needs. We specialize in water or pond features, excavation, preparing your land for landscape install, brick walks, concrete, stone or brick patios, walk ways and steps. As well as installing a brand new septic system. With over 20 years of experience, we have the quality, technique, and responsiveness you deserve. Call Troy today for your free estimate!

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Septic Tanks FAQs, answered by experts

Most homeowners know there’s a septic system problem when they can smell one. However, this isn’t exactly a scientific deduction method. Consider some of the other signs: standing water or constantly damp earth in the drainage area, toilets and sinks that won’t drain or frequently back up, and loud plumbing. You really need to be on top of routine maintenance with septic systems in order to avoid such unpleasant symptoms of a septic issue. 

A gurgling toilet usually doesn’t mean that your septic tank is full. If waste can’t drain into a full septic tank, you’ll see water and sewage backing up into your fixtures, but the air that causes gurgling is a result of poor venting. You are more likely to have a clog in your vent stack or a damaged air admittance valve.

Septic distribution boxes, also called D-boxes, tend to last over 30 years if taken care of extremely well. In most cases, however, they tend to last anywhere from 15 years to 40 years. Regular cleaning and maintenance, as well as living in an area that doesn’t flood the tank or the system regularly, will all have an impact on the lifespan of the box.

Adding a thin layer of dirt over a septic drain field is fine, especially if soil erosion has occurred. However, adding too much dirt can compact the soil, reducing the drain field’s ability to absorb and filter wastewater properly. Avoid using heavy clay soil, as it can prevent proper drainage. Instead, use a light layer of topsoil and plant grass to help with soil stability.

With so much available information about the ecological effects of cesspools (and their general unpleasantness), it begs the question: Are cesspools legal? In short, sort of. Large-capacity cesspools that serve more than 20 people are completely illegal countrywide. Existing, smaller cesspools are generally allowed as long as they’re not actively polluting. However, new cesspools are illegal to build in all 50 states and Puerto Rico, and many states offer programs to help homeowners with the costs of updating cesspools to modern septic systems.

The Manhattan, MT homeowners’ guide to septic tank services

From average costs to expert advice, get all the answers you need to get your job done.