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It's hard to get trustworthy advice when it comes to your drinking water, so we made Tips for Taps to help answer your questions.
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Microorganisms: The Good, The Bad, and the Ugly

Common Microbes (That Could Be) Lurking in Your Water

Clean water is vital for our health. So much so, that improved water safety has been credited for increasing life expectancy in the U.S. by up to 25 years within the past 10 decades.

Hard-working water utilities and technological advances account for the growth in water safety. They labor to clean drinking water through processes like filtering, disinfection, flushing programs, and deposit controls in pipes. While municipal water systems do a good job at making our water safe to drink, it doesn’t mean that it is 100% free from microorganisms.

So, just how many creepy-crawlies are floating in your water cup?

Brace yourself. It’s a pretty staggering number.  

Inside an average glass of drinking water there are  ~10 MILLION BACTERIA. While most are harmless, some are definitely not. Below you’ll find a quick rundown of common waterborne microorganisms that may be lurking in your water, what they mean for your health, and what you can do about them.

What is E. coli?

Escherichia Coli–more commonly referred to as E. coli–is a type of bacteria that normally live in animal’ and human intestines. While it is a large and varied group of bacteria, most strains are harmless. That being said, some strains can make you very sick.

Symptoms of E. coli Infection:

If you consume E. coli contaminated water, symptoms typically appear within one to eight days (i.e. the incubation period). As there are a wide array of strains, your health may be impacted in a variety of ways. However, we, at SimpleWater, are concerned with water contaminants, so we will focus on symptoms that result from consuming a common waterborne strain of E. coli (E. coli 0157:H7). Symptoms include:

  • Nausea
  • Vomiting
  • Fever
  • Abdominal pain
  • Diarrhea
  • While symptoms can last anywhere between a few days to more than a week, 90% of people who contract E. coli 0157:H7 have a self-limited infection and their outcome is (generally) excellent.

    What is Hepatitis A?

    Inflaming the liver, hepatitis A is a highly contagious virus that affects approximately 30,000 to 50,000 people the United States each year. Hep A is transmitted when a person ingests the virus via food or contaminated water that contains small amounts of stool from an infected person. The virus can enter into drinking water when the water source is contaminated with feces from infected humans. This happens through sewage overflows, polluted stormwater runoff, or incorrectly functioning sewage systems.

    Symptoms of Hepatitis A Infection:

    The incubation period for the hepatitis A virus is typically a few weeks, though not everyone who contracts the virus develops symptoms. Those who do show signs may experience:

  • Fatigue
  • Nausea and vomiting
  • Abdominal pain (especially by your liver)
  • Clay-colored bowel movements
  • Dark urine
  • Joint pain
  • Jaundice
  • Intense itching
  • While these symptoms generally remain mild and dissipate within a few weeks, hepatitis A infection-related illness may last up to several months.

    What is Legionella pneumophila?

    Legionella pneumophila is a bacterium that can cause Legionnaires’ disease–a severe (and often lethal) form of pneumonia. The bacterium occurs naturally in freshwater environments, but becomes a serious health concern when it grows and/or spreads in man made water systems–like plumbing systems. People contract Legionnaires’ disease if they breathe in (tiny) droplets of contaminated water in the air that contain the bacteria. Typically, the disease is not spread person to person.

    Symptoms of Legionella pneumophila Infection:

    It is estimated that each year in the United States, between 10,000 and 18,000 people are infected with Legionella bacteria. Symptoms of the disease typically present as pneumonia and include:

  • High fever
  • Chills
  • Cough
  • Headaches
  • Diarrhea
  • A study that examined outbreak survivors in the months following the infection, many showed persistent fatigue (75%), neurologic symptoms (66%), and neuromuscular symptoms (63%).

    What is Salmonella?

    Salmonella is a bacterium that typically live in animal and human intestines, and is spread through oral-fecal contact. The most frequent way humans become infected is through the consumption of contaminated food or water. Water may contain salmonella bacteria when:

  • Wells have been contaminated with feces from an infected human or animal,
  • Sewage overflows occur,
  • Polluted stormwater or agricultural runoff contaminates water sources
  • Symptoms of Salmonella Infection:

    Typically, those infected with salmonella bacteria show no signs. However, others may develop symptoms within eight to 72 hours. Possible symptoms include:

  • Gastroenteritis
  • Nausea
  • Vomiting
  • Diarrhea
  • Fever
  • Bloody stool
  • These symptoms tend to last between two and seven days–although it may take several months before bowels return to normal. Generally, most healthy people recover without specific treatment.

    What is Campylocabeter jejuni?

    The Campylobacter organism is a bacterium and the Campylobacter jejuni species is responsible for most cases of human illness. In fact, it is the most common bacterial cause of diarrheal illness in the United States–with almost 1% of the population affect every year.

    It can be found in water sources, like private wells, that have been contaminated with feces from infected people or animals. What’s more is that it doesn’t take a large amount of contaminated cells to make you sick. It is thought that consuming fewer than 500 cells can lead to illness!

    Symptoms of Campylobacter jejuni Infection:

    Those infected with Campylobacter jejuni often experience symptoms within two to five days of exposure. While some infected people show no signs at all, most people experience symptoms for about a week. These symptoms include:

  • Diarrhea (often bloody)
  • Nausea
  • Fever
  • Abdominal cramps
  • Vomiting
  • Because most Campylobacter infections are self-limiting, they are usually not treated with antibiotics–although antibiotics may help shorten the duration of symptoms.

    What is Girardia lamblia?

    Giardia lamblia is a parasite that can be found worldwide and within every part of the United States. However, it is particularly prevalent in areas with poor sanitation. Once a person consumes Giardia-contaminated water, the parasite lives in his or her intestines and is passed in feces. Millions of Giardia parasites can be release in a single bowel movement and they can survive outside of the body for months due to their protective outer shell. Giardia can be found in streams and lakes, and their long lifespan in the environment increases the likelihood that they can enter into water systems (including municipal water supplies).

    Symptoms of Giardia lamblia Infection:

    Giardia lamblia causes an intestinal infection–giardiasis–that can be transmitted through consuming contaminated food or water, or through oral-fecal transmission. Symptoms of giardiasis include:

  • Watery diarrhea that may alternate with soft, greasy stools
  • Fatigue
  • Abdominal cramps
  • Gas
  • Nausea
  • Weight loss
  • These symptoms may last for two to six weeks, but in some people they last far longer or recur. In people whose symptoms clear up, they still may experience intestinal problems well after the parasites are out of their system. While several drugs may be effective against the parasites, not everyone responds to them.

    What is Cryptosporidium?

    Commonly known as “Crypto,” Cryptosporidium is a parasite that is protected by an outer shell that allows it to survive outside of the body for an extended period of time. The shell also makes it very resistant to chlorine disinfection. Due to its resilience, Crypto is most commonly spread in water (both drinking water and recreational water)–making it the leading cause of waterborne disease among humans in the United States.

    Symptoms of Cryptosporidium:

    Crypto causes a diarrheal disease–cryptosporidiosis–which can be long lasting. While some people who drink Cryptosporidium-contaminated water show no symptoms at all, others may see symptoms on and off for more than 30 days. Symptoms of cryptosporidiosis include:

  • Watery diarrhea
  • Stomach cramps or pain
  • Dehydration
  • Nausea
  • Vomiting
  • Fever
  • Weight loss

  • Tap Score Water Testing

    A Final Word On Microbes:

    While these are just a few potential microorganisms in your drinking water (and believe us, there are plenty more out there!), it is important to remember that your tap water is (generally) safe. We recently covered chlorination byproducts, whose long term health impacts are concerning, but chlorine disinfection is responsible for dramatically reducing our tap water woes with microorganisms.

    Now, if you’re one of the folks hopping on the ‘Raw Water’ trend…..that’s a whole different story. Our advice on that one: hop off that trend immediately or you’ll probably get to know some of the microbes we listed a little more intimately than you’d like.

    It's hard to get trustworthy advice when it comes to your drinking water, so we made Tips for Taps to help answer your questions. Order a Tap Score Water Test and receive personalized support from professional engineers and scientists by phone, email and chat.

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