Studying the water quality is exceptionally important, there are four categories of water contaminants, those being physical, chemical, biological and radiological. If you kitchen faucet or shower head is contaminated with bacteria or viruses, you may be more prone to getting sick.
My house in the suburbs of Chicago had a problem with lead back in the 1990's, it was due to the pipes being rotted but the problem was resolved and our waters have been safe to drink since then.
The most common tests for water are coliform bacteria, E.coli, arsenic, hardness, lead/copper and etc. In the last decade the interest in home drinking water treatment products have expanded. Many chose to add a filtration system or drink out of water bottles.
The most challenging issue with maintaining high water quality is the presence of chlorine based disinfectants that are added to the water supply to kill bacteria. Unfortunately, the water testing agencies have minimum knowledge of the side effects of disinfection byproducts in our water. On the bright side, Boston drinking water has tested low levels of disinfection chemicals.
A grandma that brought her grandchildren to fish at Boston Children's Museum was explaining to us back in the 50's she would see ice skates, milk gallons, and the most random items in the Charles River. She really liked our mission of keeping the waters clean and going out on staff enrichment days to make an organization presence in the city.
Crabs ya later,
P.S. Fishing derby, what a striping fun time!