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That rotten-egg odor drifting through your Hillsboro home isn’t just unpleasant, it’s a warning sign. Sewer gas escaping into living spaces usually points to a dried-out trap, a cracked vent stack, a failing wax ring, or a break somewhere in your drain-waste-vent system. MT Dunn Plumbing tracks down the exact source of the smell and seals it off for good, so your home stays safe, comfortable, and odor-free. We don’t mask the problem with air fresheners; we find where the gas is getting in and fix it at the root.
Our highly experienced plumbing professionals will contact you for a free estimate and consultation.
MT Dunn Plumbing is a trusted choice for plumbing services in Hillsboro. Customers appreciate the team’s reliable service, skilled workmanship, and friendly customer care. Whether you need a quick repair, routine maintenance, or a new plumbing installation, they are committed to providing quality work and dependable service.
Tracking down a sewer gas leak takes real diagnostic skill, not just a strong nose.
Deep System Knowledge
Our plumbers understand how DWV (drain-waste-vent) systems are built in Hillsboro homes of every age.
Smoke and Camera Testing
We use smoke testing and video inspection to locate leaks that aren't visible to the eye.
Licensed and Insured Crews
Every technician who enters your home is fully licensed, background-checked, and insured.
Straight Answers
We explain what's causing the odor in plain language before any work begins.
Fair, Upfront Pricing
You'll know the cost before we start, with no surprise add-ons afterward.
Same-Week Scheduling
Most odor complaints get an appointment within days, not weeks.
Code-Compliant Repairs
All vent and trap repairs meet current Oregon plumbing code requirements.
Long-Term Fixes
We repair the actual defect instead of offering temporary patches that fail again in months.
Respect for Your Home
Drop cloths, shoe covers, and careful cleanup are standard on every job.
A Name Hillsboro Recognizes
Homeowners have relied on us for odor and drain issues for years.
Chasing a sewer gas odor requires a methodical process, since the smell can travel far from its actual source.
We start by asking when the smell shows up, which rooms it’s strongest in, and whether it changes with weather or water use. These details narrow down likely culprits fast.
A technician walks the interior and exterior, checking bathrooms, laundry areas, basements, and rooflines where vent pipes terminate, since a capped or blocked vent is a common cause.
Rarely used sinks, tubs, and floor drains lose their water seal through evaporation, which lets gas rise straight up through the drain. We check every trap in the home for dryness.
A worn or improperly seated wax ring under a toilet is one of the most frequent sources of sewer gas odor. We rock the toilet gently and check for movement or leakage.
When the source isn’t obvious, we introduce non-toxic smoke into the vent system and watch for where it escapes, whether inside walls, at roof penetrations, or through hairline cracks in pipe.
A push camera lets us look inside vent stacks and drain lines for cracks, disconnected joints, or debris that’s interrupting proper airflow and creating pressure imbalances.
Sometimes the plumbing isn’t broken at all, poor venting design pulls gas backward through traps when water drains elsewhere in the house. We evaluate the whole vent layout, not just one fixture.
Once smoke, camera footage, or physical inspection confirms the source, we mark the precise location so the repair addresses that spot directly rather than guessing.
Before touching a tool for repairs, we show you what we found, whether it’s a photo, video clip, or a straightforward verbal walkthrough of the issue.
Depending on the cause, this might mean replacing a wax ring, resealing a joint, refilling a dry trap, repairing a cracked vent pipe, or correcting a venting design flaw.
Most sewer gas diagnostic visits in Hillsboro run 45 minutes to two hours, with repairs often completed the same visit.
At MT Dunn Plumbing, we use advanced diagnostic equipment to locate sewer gas leaks accurately, allowing us to recommend effective repairs while minimizing unnecessary disruption to your property.
Our advanced tools help us diagnose sewer gas leaks quickly, accurately, and efficiently, ensuring reliable repairs for Hillsboro homes and businesses.
At MT Dunn Plumbing, we repair damaged drain and vent pipes in Hillsboro using proven methods that restore proper drainage, eliminate sewer gas leaks, and protect your plumbing system.
Our goal is to deliver durable drain and vent pipe repairs that restore safe, efficient plumbing and long-lasting peace of mind.
From what we’ve seen, the answer is yes, especially if the odor keeps returning. At MT Dunn Plumbing, we’ve found that while some sewer gas odors have simple causes, persistent smells should never be ignored.
A brief sewer odor after a hot day or from a rarely used drain is often caused by a dry P-trap and is usually easy to resolve by running water through the fixture. However, when the smell lingers or repeatedly returns, it often indicates that sewer gas is entering your home through a plumbing defect, damaged vent, or hidden drain problem.
We’ve responded to homes where occupants lived with a mild sewer odor for months, believing it was simply part of an older plumbing system. During our inspection, we discovered issues such as cracked vent stacks, damaged drain lines, or faulty plumbing connections that allowed sewer gas to escape into concealed spaces. These situations can affect indoor air quality and become much more expensive if left unresolved.
We especially recommend fast inspections if the odor is accompanied by gurgling drains, slow drainage, frequent drain backups, or symptoms such as headaches or nausea. These signs often point to a plumbing issue that requires professional attention.
If a sewer gas smell keeps coming back, don’t assume it’s normal. A professional inspection can quickly identify the source, restore safe indoor air quality, and help prevent more serious plumbing problems in the future.
It helps to know what you’re dealing with before calling anyone out.
Feature
Smell Description
Common Location
Underlying Cause
Health Risk
Who to Call
Fix Complexity
Urgency Level
Detection Method
Sewer Gas Smell
Rotten eggs, sulfur-like odor
Bathrooms, laundry rooms, basements
Dry trap, vent break, wax ring failure
Headaches, nausea at higher exposure
Licensed plumber for DWV system diagnosis
Often resolved in a single visit
Address within days
Smoke test, camera inspection, trap check
Other Common Odors (Mildew, Gas Leak, etc.)
Musty (mildew) or a distinct "rotten egg" additive smell (natural gas)
Mildew: damp areas; gas leak: near appliances or gas lines
Moisture buildup or a leak in gas supply lines
Mildew: allergies; gas leak: explosion risk, requires immediate evacuation
Mildew: remediation specialist; gas leak: utility company immediately
Varies widely by cause and extent
Gas leak: emergency, leave home immediately
Moisture meters (mildew) or gas detectors (leak)
If you ever suspect a natural gas leak rather than sewer gas, leave the house immediately and call your gas utility, that’s a different emergency entirely from a plumbing vent issue.
Fast Response • Upfront Pricing • Guaranteed Work
MT Dunn Plumbing pinpoints the exact source of sewer gas odors, whether it’s a dry trap, a failed wax ring, or a cracked vent stack, and repairs it correctly the first time.
Some sewer gas situations can’t wait for a scheduled appointment.
Priority Dispatch
Odor complaints involving headaches or nausea move to the front of our schedule.
After-Hours Availability
Our team takes emergency calls evenings, weekends, and holidays.
Rapid Diagnostic Tools
Smoke testing equipment and cameras travel with our trucks, ready to deploy immediately.
Safety-First Protocol
If there’s any chance of a natural gas leak instead of sewer gas, we advise evacuation before anything else.
Honest Urgency Assessment
We’ll tell you plainly whether your situation needs same-day attention or can safely wait.
Temporary Ventilation Guidance
While we’re en route, we advise on safely ventilating the affected area.
Upfront Emergency Pricing
You’ll know the cost of emergency service before we begin work.
Efficient On-Site Repairs
Many urgent fixes, like a dry trap or a loose wax ring, are resolved during the first visit.
Clear Aftercare Instructions
We explain how to prevent the odor from returning, especially for rarely used fixtures.
Follow-Up Check
We’ll confirm the smell hasn’t returned once the repair has had time to settle.
Intermittent odors often come from a partially dry trap or venting issues that worsen with certain weather conditions or water usage patterns elsewhere in the home.
In small amounts it’s mainly unpleasant, but prolonged exposure to higher concentrations of hydrogen sulfide can cause headaches, nausea, and other health effects.
Yes, if the cause is a dried-out trap, running water through that fixture for a minute often refills the seal and stops the odor immediately.
Unused drains lose their water seal through evaporation over time, allowing sewer gas to rise unobstructed through that fixture.
Natural gas has a similar rotten-egg additive smell for safety, so if you’re unsure, treat it as a potential gas leak, leave the home, and call your gas utility right away.
Costs vary by the complexity of the search, but a straightforward trap or wax ring issue is generally far less expensive than a full vent stack repair.
Yes, we diagnose and repair sewer gas odor issues for residential and commercial properties throughout the Hillsboro area.
A persistent rotten-egg smell in your Hillsboro home deserves a real answer, not a guess. MT Dunn Plumbing will find exactly where sewer gas is entering your home and seal it off correctly the first time.
Contact MT Dunn Plumbing today to schedule your sewer gas odor inspection.
At M T Dunn Plumbing, our team is committed to delivering dependable plumbing solutions for residential and commercial properties throughout Sherwood and the surrounding communities.
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