Arsenic: Arsenic is a naturally occurring element which contributes to various cancers, neurological disorders and circulatory problems. Arsenic is an "accumulative enabler" which can build up in the body, reducing the body’s ability to resist problems. The EPA standard was lowered from .050 mg/L to .010 mg/L because of the long term health issues affected by consumption of arsenic.
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Bacteria, Coliform: Coliform bacteria can be plant or soil bacteria but this family of bacteria also includes pathogenic organisms. One colony is considered a fail, so this test is done on a presence / absence basis.

Bacteria, E-Coli: E-coli bacteria come from the intestines of warm-blooded animals and represents a serious water quality problem. The water should not be consumed, and the source should be found and stopped. One colony is considered a fail, so this test is done on a presence / absence basis.

Chloramines: Chloramines are a combination of chlorine and ammonia that are added to public water supplies to prevent bacteria.  The combination of chlorine and ammonia reduces the presence of “disinfection by-products” which are normally caused when surface water supplies are chlorinated.

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