A serious health threat to humans is sewage backflows. In an indoor environment, water is considered to be the most long-term destructive substance. Since water supports the growth of microorganisms, it also weakens and dissolves a lot of various materials as well. Since it flows, water is capable of carrying various kinds of allergens and pathogens that are hazardous to people.
A quick reaction to backups, flooding, spillage, seepage is necessary when a water emergency occurs. To save valuable property from direct water damage and microbial growth from destroying your belongings, immediate attention needs to be done.
Waste And Sewage
A very significant threat to human health is sewage. However, the seriousness of the health threat depends on the content of the sewage and the degree and extent of penetration into the building environment. The amount of time the sewage remains in contact with materials; the quantity of sewage and the porosity of contaminated materials are the factors that dictate the degree of penetration. The restoration response may vary in each situation so you should consider at least three examples of sewage leaking into an indoor environment.
In this situation, the waste is designated in one specific location, is contained, and does not exert force on the building infrastructure. A limited amount of time in terms of contact has occurred. Waste that overflows in a bathroom and is deposited on and confined to a tile floor is an example of this situation might be. In this situation, there is a limited quantity of waste, which is isolated and does not touch absorbent materials. Decontamination, which includes disinfection, cleaning and water extraction, can be effective in lessening this particular potential health risk.
Waste that originates in the built environment is deposited or flows beyond the confines of the building’s disposal system. In this case, there is limited or confined flooding, but water and waste penetrates the structure and furnishings of the building. For example, flooding occurs in a men’s room of an office building, water flows under a wall and into the carpet of an adjacent hallway. In this case, although it penetrates regions of the environment that have complex surfaces and are difficult to restore, there is a limited amount of waste that is confined to a relatively small area of the building. Drying all surfaces that have been in contact with the sewage is an effective restoration technique that involves decontamination. Getting rid of the cushion and treating the two sides of the carpet
thoroughly with a disinfectant are all necessary in terms of stretch-in carpets, cleaning and lifting the contaminated carpet. Affected porous wall materials need to be sanitized with a disinfectant and evaluated for replacement. Comprehensive and aggressive treatment can be effective due to the confinement of the sewage spill.
Where the waste is widely dispersed and penetrates both the structure and its furnishings waste that originates in the built environment, along with other wastes from the primary line of the sewage system, is backed up into the natural environment. In this situation, because humans can be exposed to pathogenic raw wastes that has penetrated and become contained by the building and its furnishings there is extensive risk. Homeowners will have to be evacuated, and restoration should begin immediately if flooding is from this kind of primary outside sewage system. In this situation, by using respirators with high-efficiency particulate air (HEPA) cartridges, rubber boots, gloves, splash goggles, and protective garments restoration and cleaning professionals should be cared for. To avoid puncture wounds during the restoration process, extreme care should be taken. Restoration personnel who have open sores or cuts should not be allowed to work on this kind of restoration project.
How to Handle Contamination
When a building is contaminated with sewage backing up from the septic lines, or flooding of a building occurs that involves sewage or a heavy load or organic matter, as in the case of river flooding, a serious threat to human health exists. Extensive damage to materials will occur immediately or in time without appropriate action. Before the cause of the backup is determined, flooding subsides and the problem is corrected, a duration of time will have to pass. This allows extensive contamination and permeation of absorbent (hygroscopic) materials such as concrete, paper, gypsum and wood to occur. This penetration with organic matter and water leads to the growth of potentially ailment-causing (or opportunistic) microorganisms. These kinds of bacterial organisms may pose a serious health risk to occupants of the building. Organic matter and water-saturated materials can be used as substrate for growth of microorganisms such as gram-negative bacteria and toxigenic fungus that can create substances that are lethal to humans and are hazardous to materials. To contribute to microbial growth on structural materials and contents, a large amount of water inside a building will cause high humidity.
Some of the questions to be answered in this situation include the following: What are the effects of the initial contamination of the building, its contents, and the health and welfare of its occupants? To thoroughly clean up the contamination and repair the damage, what is needed? Should the whole building or just a part of the building be evacuated and for how long should this last? Can semi-porous materials be sanitized and freed from contamination, or should they be replaced? What is the trade-offs of using insufficient measures to remediate the damage? What are the indicators that help show when the building is safe or not safe for people to move it? What procedures should be used to test for these indicators? What is the effect of the sewage damage on other systems, especially the air changing systems (ACS) and the heating, ventilating, and air conditioning (HVAC) systems in the build environment?
There are several factors that are related to the remediation of the problem. Among these are the nature of the contamination, the types of water-damaged materials (organic or synthetic; porous, semi porous, or nonporous), the sewagemicroflora (pathogens and allergens), organic matter load, water volume, and impact of ambient outdoor temperature and humidity on the indoor environment. Of major concern is the survival of sewage-borne micro flora (viral, bacterial, fungal, parasitic, and their potential transmission to
humans. The potential exists for some fungal and bacterial contaminants to establish an ecological niche and present a health risk from chronic exposure for some time after the event.
Scope of these Guidelines
The discussions within this paper will address the immediate and longer term effects of sewage-flooding contamination on the building’s structural materials and contents; the potential effects on occupants; and the steps to remove contamination to include flushing with clean water and detergent solutions, vacuuming, dehumidification, and disinfection. The potential health threats presented at each stage of remediation will be discussed.
These include the production of bioaerosols during removal of gross contamination, the long-term effects of residual moisture and organic matter on the building and occupants, and the colonization and growth of non-sewage-borne species of microorganisms such as molds and other fungi.
Assessment of Damage and Danger to Health
The factors that determine the extent of contamination within the building include the volume and the solids content of the sewage backflow, whether flooding is isolated to the basement or involves other levels as well, and how long the contamination has been in place. The assumption must be that potential pathogens are present in the contamination. Such microbial contamination includes bacteria, fungi, viruses, and parasites. This lists the micro flora that may be found in raw, untreated sewage and the diseases that these organisms have the potential to cause. Also, hypersensitivity lung disease has been shown to be caused by repeated flooding of homes with sewer water.
The routes of exposure of the building occupants to these pathogens are contact, ingestion, and inhalation. An incomplete or inadequate job of cleaning and disinfection may leave residue that can be a substrate for disease-causing microorganisms. Occupants may be infected by contacting contaminated surfaces, with inadvertent transmission from hands to mouth, or aerosolization of contamination may result in the inhalation of microorganisms or their products (e.g., endotoxins). Residue and microbial contaminants also can be tracked by occupants’ feet to other parts of the building.
Another aspect of health impact is that the conditions caused by sewage backflow or flooding are conductive to the growth of nonsewage microorganisms. These conditions include wetness, humidity, and organic matter. Microorganisms, which exist in various life stages in both indoor and outdoor environments, would then have the opportunity for exponential population growth. These species can produce bioaerosols,
which are potential sources for disease. For example, mold allergy is a common source of indoor air symptoms and complaints.
In regard to the susceptibility of building occupants, those individuals whose immune systems are in some way compromised (i.e., immune and compromised), or who are otherwise susceptible due to age, medication, or underlying illness, are considered to be at greater risk of contracting potentially fatal infections than those individuals who are healthy.
