Almost 8 percent of community water systems are plagued by health-based violations of water quality standards in any given year, the study found.
Other contaminants found in water systems included viruses and the parasites cryptosporidium and Giardia lamblia, the study reported.
Nitrates were also a common contaminant in water systems, the study found.
The study found that areas that purchase their water were less likely to experience contamination, Allaire said.
One gallon of water per person and pet, per day, as well as a camping filter for water to remove contaminants.
Allaire said that merging and consolidating water systems might help ensure quality drinking water because a larger system would likely have more resources available.
The study included data from nearly 18,000 community water systems.
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