Can You Shower With Coliform Bacteria? Risks and Safety

What are coliform bacteria and where are they commonly found?

Coliform bacteria are a broad group of rod-shaped microorganisms that naturally inhabit the intestines of warm-blooded animals and are also found in soil, vegetation, and surface water. They are defined by their ability to ferment lactose and produce gas at specific temperatures. A common example is Enterobacter, which often thrives in decaying plant matter and soil environments.

While these bacteria are generally considered indicators of sanitary quality, they aren't always evidence of fecal contamination. The nuance lies in the distinction between total coliforms and fecal coliforms. Total coliforms exist widely in the environment and don't necessarily pose a direct threat to human health. However, their presence in a closed system like a well suggests that surface water or contaminants have infiltrated the supply, which serves as a warning that the barrier between the environment and your tap has been compromised.

How do coliform bacteria enter a residential water supply?

These bacteria typically enter residential systems through compromised well seals, cracked casings, or backflow events where contaminated surface runoff is pulled into the plumbing. A lot of people assume that deep wells are naturally protected from all surface bacteria, but heavy rainfall or flooding can easily transport soil-borne coliforms into the water table, especially if the wellhead lacks a proper sanitary cap or is located in a low-lying area prone to pooling.

What are the potential health risks associated with skin contact with contaminated water?

Skin contact with contaminated water poses a risk primarily when the protective barrier of the epidermis is broken or compromised.

• Folliculitis can develop if bacteria enter hair follicles, leading to red, itchy, or pus-filled bumps on the skin.
• Cellulitis represents a more serious infection where the bacteria penetrate deeper tissue layers, causing significant swelling, warmth, and spreading redness.
• Conjunctivitis often occurs if contaminated water splashes directly into the eyes, resulting in irritation, discharge, and inflammation of the ocular membrane.
• Impetigo is a common bacterial skin infection that can manifest as honey-colored crusts or sores, particularly in areas where the skin has been scratched or irritated.

Does the presence of total coliforms in water indicate the presence of E. coli or other pathogens?

No, the presence of total coliforms does not confirm the presence of E. coli or other dangerous pathogens. Total coliforms act as a broad indicator, whereas E. coli is a specific subset that more accurately signals recent fecal contamination and a higher likelihood of harmful bacteria being present.

What specific symptoms might indicate a waterborne infection acquired through bathing?

Infections acquired through bathing typically manifest as localized skin issues or systemic symptoms if the water is accidentally ingested.

• Gastroenteritis often follows the ingestion of contaminated water, characterized by sudden nausea, abdominal cramping, and watery diarrhea.
• Otitis externa, commonly known as swimmer's ear, involves pain, itching, and discharge resulting from bacteria trapped in the ear canal after showering.
• Pyrexia, or a fever, may develop if a skin infection progresses or if a systemic response occurs following the entry of pathogens into the bloodstream.
• Urticaria or hives can occasionally appear as an allergic or inflammatory reaction to the presence of high concentrations of environmental bacteria on the skin surface.

Are there specific groups of people, such as those with open wounds or compromised immune systems, who are at higher risk?

Yes, individuals with compromised immune systems or open wounds face a significantly higher risk of systemic infection or sepsis. For these groups, even low concentrations of bacteria that a healthy person might tolerate can lead to hospitalization, as their bodies lack the necessary defenses to neutralize common environmental pathogens.

What water treatment methods are effective for eliminating coliform bacteria from a home plumbing system?

Eliminating coliforms from a home system usually requires a multi-step approach, starting with shock chlorination to disinfect the well and the entire distribution network. This involves introducing a high concentration of chlorine—often 200 parts per million—into the well casing and letting it sit for at least 12 to 24 hours to ensure contact time. After this period, the system must be flushed until no chlorine odor remains, followed by re-testing.

Continuous solutions include ultraviolet light systems, which provide an effective, chemical-free way to neutralize bacteria as water passes through a chamber. However, a major exception exists: if the water contains high levels of turbidity or sediment, the UV light cannot reach the bacteria effectively, as the particles shield the microorganisms. In such cases, pre-filtration is mandatory to make sure the light successfully penetrates the water column.

How can homeowners test their well or municipal water for the presence of coliform contamination?

Homeowners should contact a state-certified laboratory to obtain a sterile sampling kit and follow strict protocols to avoid cross-contamination during collection.

Use these results to determine if your water meets the standard of zero total coliforms per 100 milliliters of sample.