The egg smell is likely Hydrogen sulfide gas and no, it is not harmful in the miniscule amounts found in your water (http://pureintake.com/PI/hydrogen_sulfide_gas.aspx). Wikipedia describes it as “very poisonous” but mentions that the human body produces small amounts. When I was a youngling my parents well water stunk something awful but it was probably the best tasting water I’ve ever had. Dr. Oz (of Oprah fame) had a show on the 7 wonders of the world and amongst them was volcanic sulfur (which isn’t exactly the same as the gas) which was known for its antiseptic properties as well as treating skin blemishes, eczema, and wrinkles. Before antibiotics in the 40′s, sulfur was commonly used to treat infections. The show suggested buying it from a compunding pharmacist and adding it to bath water (just don’t burn it). The well water is probably regularly tested; the comments section from this site cover some water questions for Flowing Well Park http://www.indyscribe.com/local_attractions/flowing_well_park.html

thanks for testing the water.  The TDS is pretty high so I would advise to not drink daily. Most sources recommend a good/safe water to have a TDS under 75 ppm….Lots of calcium in the water, too much, just calcifies the blood and bones…