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ODORS GASES SMELLS, DIAGNOSIS & CURE
AIR POLLUTANTS, COMMON INDOOR
AIR QUALITY IMPROVEMENT STRATEGIES
ALLERGEN TESTS for BUILDINGS
ANIMAL or URINE ODOR SOURCE DETECTION
BACKDRAFTING HEATING EQUIPMENT AQ
BIOGAS PRODUCTION & USE
BOOKSTORE - ENVIRONMENTAL
CARPETING & INDOOR AIR QUALITY
CHINESE DRYWALL HAZARDS
CHEMICAL CONTAMINANTS in WATER
COMBUSTION GASES & PARTICLE HAZARDS
DIRECTORY of MOLD / ENVIRONMENTAL EXPERTS
DISINFECTING BUILDINGS with BLEACH
DRYWALL MOLD TESTING
DUCT SYSTEM & DUCT DEFECTS
DUST SAMPLING PROCEDURE
EMERGENCY RESPONSE, IAQ, GAS, MOLD
FLOOD DAMAGE ASSESSMENT, SAFETY & CLEANUP
GASES, EXPOSURE, TESTING
GAS DETECTION INSTRUMENTS
GAS EXPOSURE LIMITS & STANDARDS
INDOOR AIR QUALITY & HOUSE TIGHTNESS
INDOOR AIR QUALITY IMPROVEMENT GUIDE
INDOOR AIR QUALITY METHODS COMPARED
LIGHT, GUIDE to FORENSIC USE
GAS LP & NATURAL GAS SAFETY HAZARDS
Legionella Legionnaires' Disease
METHANE GAS SOURCES
MILDEW in BUILDINGS ?
MOISTURE CONTROL in BUILDINGS
MOLD: A COMPLETE GUIDE to TEST CLEAN PREVENT
MOLD ACTION GUIDE - WHAT TO DO ABOUT MOLD
MOLD EXPERT, WHEN TO HIRE
MOLD or INDOOR AIR EMERGENCY RESPONSE
TEST KITS for DUST, MOLD, PARTICLE TESTS
MVOCs & MOLDY MUSTY ODORS
ODORS GASES SMELLS, DIAGNOSIS & CURE
OUTHOUSES & LATRINES
OZONE for MOLD OR ODORS
PLUMBING SYSTEM ODORS
SEPTIC & CESSPOOL SAFETY
SEPTIC SYSTEM ODORS
SEPTIC TREATMENTS & CHEMICALS
SEWAGE & SEPTIC CONTAMINANTS
SEWAGE CONTAMINATION in BUILDINGS
SEWAGE EJECTOR / GRINDER PUMPS
SEWAGE PATHOGENS in SEPTIC SLUDGE
SEWAGE BACKUP, WHAT TO DO
SEWAGE BACKUP TEST & CLEANUP
SEWER GAS ODORS
SEWER LINE REPLACEMENT
SMELL PATCH TEST to Track Down Odors
STAIN & BIODETERIORATION AGENT CATALOG
STAINS on & in BUILDINGS, CAUSES & CURES
SULPHUR & SEWER GAS SMELL SOURCES
THERMAL IMAGING MOLD SCANS
UV LIGHT BLACK LIGHT USES
VENTILATION in BUILDINGS
VOCs VOLATILE ORGANIC COMPOUNDS
WASTEWATER TREATMENT BASICS
WATER ODORS, CAUSE CURE
WATER TESTS, CONTAMINANTS, TREATMENT
WATER TEST CHOICES & WATER TEST FEES
WATER TREATMENT EQUIPMENT CHOICES
WATER, WELLS, WATER TANKS: TESTING GUIDE
WETLAND SEPTIC SYSTEMS
This article describes how to How to Test for & Trace Sewer Gas Smells and Septic Tank Odors in a Building or how we might trace "gas odors" in buildings with a focus on homes with a private onsite septic tank or for owners whose home is connected to a public sewer system as well. What makes the smell in sewer gas? Sewer gases are more than an obnoxious odor.
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Tests for Indoor Sewer Gas & Septic Odors - Indoor Gas Leaks using the TIF 8800 Combustible Gas Analyzer
In addition some writers opine that there are possible health hazards from sewer gas exposure, such as a bacterial infection of the sinuses (which can occur due to any sinus irritation). Depending on the sewer gas source and other factors such as humidity and building and weather conditions, mold spores may also be present in sewer gases.
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Tests for sewer gas or septic odor gas leaks: When looking for gas leaks and tracking gas smells, one method to get more precise is to use an instrument sensitive to a broad range of combustible organic gases.We use a TIF 8800 combustible gas analyzer set at its most sensitive setting to sniff for gas leaks.
Our photo at above left illustrates a type of hidden and subtle source of sewer gas odors in buildings: defects in the building drain, waste, or vent piping that are hidden in wall or ceiling cavities. This particular leak is discussed at DRAIN PIPING & SEWER ODORS .
Here are some ways we use the TIF 8800 to screen for and trace sewer gases in a building
Also see TIF 8800 GAS DETECTOR for a detailed procedure of how this instrument is employed and for a list of gases to which it will respond.
Watch out: The use of most test instruments gives only an instantaneous indicator of a substance that is present at the time of the test and in the location tested. Tests for individual substance or even individual classes of substances are never a complete assurance of building conditions, as other substances not within the scope of the test may be present.
And instrument tests are never a sure indicator that hazardous substances are not present or have not been present at other times or under different building conditions. Never rely only on the results of test instruments when examining a building for unsafe conditions such as gas leaks.
Expert visual inspection of the building exterior, interior, and mechanical systems as well as an understanding of the building's damage, leak, and repair history and of the vulnerability of particular construction designs and materials are all important considerations when evaluating the condition of a structure.
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Frequently Asked Questions (FAQs)
Question: foul odor around our house forces us to close the windows
(Oct 3, 2012) Rudy said:
There is a foul odor around our house the main problem finding the source the intermittent occurrence of the odor. This odor does not smell like anything ever smelled by myself or my wife. While windows are open the odor will come from outside through mostly back room windows. When I say odor I mean it knows your socks off, forcing us to close all windows. Sometimes it will last for minutes other times for longer periods. We can only say it happens towards the start of evening or late night. We have had Fire department come by to help but it is not always present and calling them draws valuable resources from the city. Can you help?
Or start with our odor diagnosis suggestions found at the home page for this topic ODORS GASES SMELLS, DIAGNOSIS & CURE
After reviewing your site discovered a reference to height requirement of sewer vent pipes. The recommendation states these pipes should be at least 6 to 12 inches high. Decided to head outside and see what mine were and immediately a question popped into mind. Are we talking 6 to 12 inches from installed location or highest point on the roof.
Also I live on a slight hill so my house sits between two others, the higher elevation home is about 10 to 12 feet higher while the lower home is only about 3 feet below our home. I mention this only to see if this would affect the vent sewer pipe height requirement.
The vent pipe height recommendation refers to height above the roof surface at the point of penetration of the roof deck. I would add that for freezing climates the vent pipe diameter may be quite important too if we are to avoid drain and vent problems due to frost clogging of the vent or covering of vents by deep snow.
Sure on occasion site factors such as nearby buildings or hills or trees can also generate downdrafts that can blow rooftop-vented sewer gases down to ground level, but in my experience the rooftop vent would not be so likley to be the source of very strong odors right at the building exit door, and your note did not make clear that this is a sewer gas or septic system odor anyway.
Have you looked for signs of a dead animal nearby or even in a crawl area?
Question: source of foul smell from air conditioning ducts
(Aug 23, 2012) Kathy Ng said:
Question: is there some sort of device that can detect sewer gases?
I believe we have a sewer gas problem in our office building. The building owner had a plumber out to investigate and the plumber was useless, saying that it is a dead animal causing the smell and insists that it is not a plumbing problem. Our exterminator, who treats our building on a monthly basis, said that the smell is not a dead animal, not for 4 months. After the plumber investigated, one of our clients, who is an engineer, came into our office for an appointment and as soon as he walked in our lobby, he said “You all have sewage gas leak.”
We informed the building owner of his statement. The owner had someone to come out and dig up the sewer main drain line inside our building, more specifically, our downstairs conference room, which is located next to my office. They found 3 very small wet spots on the drain line. They replaced a small section of piping where the 3 tiny wet spots were and capped an old open pipe; however, the smell is still very much present.
Our office staff has been staying sick with sinus infections and headaches for the past several months. The building owner will not call another plumber to get a second opinion. I would like to know if there is some sort of a device that can detect sewer gases. If so, what type of professional would we call to help us. I have been researching this problem for a month. In order, to get the building owner to seek additional action, I must have on hand to show them. Please help me out if you can.
The staff and I are sick of being sick and smelling this rancid smell. I greatly appreciate your time spent reading this email. If for any reason at all you need to contact me, my office contact information is below. Again, thank you for your time. PS: If this info is useful, our building is over 100 years old and is located in the city (city water/sewer). - S.R. 2/19/2014
Please review the article above to which I referre you by private email. Also let me re-emphasize that while instruments can be helpful in tracking down the most-likely sources of an odor in a building, I would never rely on an instrument alone: without an expert and thorough inspection and without a thoughtful history-taking of the building's plumbing and leak events, occupant complaints, and other factors, an instrumented test risks missing important hazards or conditions.
For example, in the caseyou describe one would want to know the history of sewage backup or spill, what cleaning was performed, what else may be needed, and also whether or not wet areas created a mold contamination problme, and thirdly whether there is some other irritant source in the building.
Reader Question: (Apr 30, 2012) John Rapciak said: I would like to know where i can buy testing equipment or patches, i believe bad or maybe toxic fumes are coming into my bathroom (fan on or off) from my exhaust fan, possibly from my neighbors apt. through their exhaust fan. Will you help! Thank You, John R. 708-466-7819.
Reply: John, to avoid any possible conflict of interest, InspectAPedia does not sell anything. Your question is a bit too broad an approach - what sort of equipment or "patches" are you thinking about? As there are many possible indoor contaminant sources and tests tend to be rather specific, you may have better results by tracking down the odor to its source first. If you hire an expert to perform testing, do not rely on tests alone - be sure that your expert really is one, and that s/he conducts a thorough inspection of the property and its venting system. Gas testing equipment products, brands, manufacturers and sources are listed in this article series both in the articles and in the article references section.
Questions & answers or comments about how to test for & track down the source of sewer gases or odors in buildings. .
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