Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially-harmful, bacteria may be present.
E. coli are bacteria whose presence indicates that the water may be contaminated with human or animal wastes. Human pathogens in these wastes can cause short-term effects such as diarrhea, cramps, nausea, headaches, or other symptoms. They may pose a greater health risk for infants, young children, the elderly and people with severely compromised immune systems
Infants below the age of 6 months who drink water containing nitrate/nitrite in excess of the maximum contaminant level could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue baby syndrome
The maximum contaminant level for nitrites in drinking water is 1 mg/L
The maximum contaminant level for nitrates in drinking water is 10 mg/L
Homes with infants and children should consult their doctor about water containing nitrates and nitrites
Today, hardness is defined as sum of calcium and magnesium concentrations which is expressed as calcium carbonate in milligrams per liter. High levels of magnesium and calcium can build up in home plumbing and reduce flow as well as damage water-using appliances over time.
0 to 60 mg/L (milligrams per liter) as calcium carbonate is classified as soft;
61 to 120 mg/L as moderately hard
121 to 180 mg/L as hard; and more than 180 mg/L as very hard.
Iron does not pose any immediate health concerns. The EPA has set for a secondary contaminant maximum level list that indicates iron should not exceed 0.3 mg/L. In cases where iron exceeds this limit, the water aesthetic will be greatly compromised. The water may have a rusty color, sediment, metallic taste, reddish or orange staining.