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ODORS GASES SMELLS, DIAGNOSIS & CURE
PLUMBING SYSTEM INSPECT DIAGNOSE REPAIR
ANODES & DIP TUBES on WATER HEATERS
BACKUP PREVENTION, SEPTIC
BACKUP PREVENTION, SEWER LINE
BACKWATER VALVES, SEWER LINE
CHEMICAL CONTAMINANTS in WATER
CHLORINE IN DRINKING WATER
DEPTH of SEPTIC TANK
DRAIN & SEWER PIPING
FLOOD DAMAGE ASSESSMENT, SAFETY & CLEANUP
FLOOR DRAIN / TRAP ODORS
GAS PIPING, VALVES, CONTROLS
HARD WATER - SOFTENERS
METHANE GAS SOURCES
ODORS GASES SMELLS, DIAGNOSIS & CURE
ODORS IN WATER
ODORS, SEPTIC or SEWER
ODORS SEWER GAS in COLD WEATHER
ODORS, SULPHUR SMELL SOURCES
ANIMAL or URINE ODOR SOURCE DETECTION
PIPING IN BUILDINGS, Clogs Leaks Types
PLUMBING FIXTURES, KITCHEN, BATH
PLUMBING NOISE CONTROL
PLUMBING VENT DEFINITIONS & CODES
PLUMBING VENT DEFECTS & NOISES
REPAIR BURST LEAKY PIPES
SEPTIC METHANE GAS
SEPTIC SYSTEM INSPECT DIAGNOSE REPAIR
SULPHUR & SEWER GAS SMELL SOURCES
TOILETS, INSPECT, INSTALL, REPAIR
WATER TESTS, CONTAMINANTS, TREATMENT
WINTERIZE A BUILDING
How to troubleshoot sewer or septic odors due to building drain problems: this article explains sewer gas odor troubleshooting for odor sources due to blocked or slow plumbing drains.
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Another indoor sewer gas odor explanation is that there may be a partial blockage and possibly even a leak (photo at left) in a waste line such in a crawl space, below a basement floor, or outdoors between house and septic tank or less likely between septic and fields.
The "glub glub" sound discussed above can also be caused by a partially-blocked drain which is simply slow.
When a building drain is slow due to partial blockage (or bad venting), sewer gases, smells, odors may travel backwards up into the building through the plumbing drain openings.
If the building drain waste vent system has inadequate venting a result may be the loss of water from the building fixture traps. In turn this loss of water from traps permits sewer gases to rise up drain piping and out into occupied space through the building sinks, showers, tubs, and in extreme cases, even toilets.
Don't forget that a loose toilet may itself be an odor source - with sewer gases leaking out around the toilet base. If sewer gas smells are peculiar to a single bathroom we might check for toilet leaks. Even if a toilet seems bolted securely to the floor, its wax ring seal may be damaged, permitting sewer gases and odors into the building. At Fixture versus system blockage (just below) we provide steps to diagnose plumbing fixtures as the prime odor sources.
Drain noises due to bad venting or due to a partial blockage will be invariant day or night, depending on drain usage, but in the more quiet still and cool night air, drain noises are more easily heard.
As we said earlier, partially blocked building drain, septic tank, or drainfield can generate odors indoors or outside.
Odors in this case will usually correspond to surges in system use, and odors should not correspond particularly to cold weather, except insofar as cold still air may permit gases to fall (from a plumbing vent stack, for example) , or different seasonal wind patterns may cause gases to move to areas where they're not noticed in warmer weather.
See Plumbing Vent Defects for procedures to diagnose problems with the building drain vent system.
See Using the TIF 8800 Gas Detector for tips on using a gas detection instrument to scan for sewer gas sources in a building.
Also see DRAIN PIPING & SEWER ODORS for details about odors coming from plumbing drains.
Also see our broad-scope article on diagnosis and cure of sewer gas and septic odors: Sewer Gas Odors diagnosing, finding, and curing septic tank and sewer line smells. Also see ODORS & SMELLS DIAGNOSIS & CURE for procedures to diagnose and cure all kinds of odors in and around buildings.
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Technical Reviewers & References
Related Topics, found near the top of this page suggest articles closely related to this one.
Design Manuals for Septic Systems
Onsite Wastewater Disposal Books