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*The Angi rating for Sewer Cleaning companies in Boulder, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Sewer Cleaning needs.

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Last update on March 20, 2026

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Sewer Cleaning questions, answered by experts

Costs range from $200 to $600, depending on the severity of the blockage and access difficulty.

Knowing the signs can alert you to a clogged drain line. Clogs cause slow drainage or cause no drainage (if there’s a complete blockage). You may also notice foul odors, gurgling noises, water backing up in other appliances on the same line, or a poorly flushing toilet. If you experience any of these issues and think your line might be clogged, call a plumber.

A sewage smell in your crawl space is usually from a damaged or clogged pipe leaking sewer gasses or actual sewage underneath your home, but there are some other common causes. Moisture, from poor or damaged encapsulation or a malfunctioning sump pump, can harbor mold and bacteria, causing a musty smell. Pests can also get stuck in your crawl space and die, which causes a sewage-like odor.

It is generally safe to stay in a house that smells like sewage for a short time, but you should get the problem fixed as soon as possible. While the level of sewer gas is usually low enough to only cause minor symptoms, prolonged inhalation can lead to headaches, nausea, or respiratory irritation. High levels of gas exposure can be more dangerous, and high concentrations of methane—a component of sewer gas—can pose an explosion risk in enclosed spaces. If you smell sewer gas in your home, ventilate the area and call a professional to locate, assess, and fix the problem, as it will not go away on its own.

Simple blockages can be cleared using household plungers or manual snakes, provided no severe plumbing issues exist.

The Boulder, MT homeowners’ guide to sewer cleaning services

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

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