Many consumers assume that if their water looks, tastes, and smells okay that it's safe to drink. Unfortunately, few contaminants can actually be detected by our senses, so water testing may be needed. The four main contaminant categories are as follows: Microbiological Contaminants Most health departments require a total coliform test to determine if bacteria is present in a well when it is first put into service or when the property changes ownership. Two additional forms of potential microbiological contamination include parasites and viruses, although these are most frequently found in surface water supplies. Inorganic Contaminants This category includes metals and minerals that can affect either the safety or taste of well water. They can be naturally occurring or may result from manmade contamination.

Some common inorganics found in well water include:

• Nitrates/Nitrites (fertilizers, onsite septic systems)
• Arsenic (naturally occurring/manmade contamination)
  
• Sodium (naturally occurring/some treatment systems) Chemicals Chemicals can also leach into well water supplies from the application of pesticides, runoff from agricultural and industrial operations, or from gasoline storage tanks.
  
• Volatile Organic Chemicals or VOCs (pesticides, etc.)
  
• MTBE (gasoline additive) Radiological The fourth type of contaminant sometime found in private wells would be radiological in nature, such as:
  
• Radon (gas; also can be found in indoor air)
• Radium 226/228 (from decaying uranium deposits)
  

Consumer Hotline:

1-888-99-SAFER

Website:

www.nsf.org

Have your water tested to determine if any contaminants are present in your drinking water supply.

Drinking Water Fact Kit Water Testing Tips