Your best bets are Denville, Morristown, Morris Twp., Mt. Arlington, Mt. Olive, Netcong, sections of Randolph (proximity to Dover rail station). There are MANY 3BR/2 BA homes available for sale in the price range you stated. Over the past few months I've seen some fine homes in completely move in condition which could possibly interest you.
As for known pollutants, prior to purchasing your home a home inspection would be conducted to ensure any possible present level of radon is below the acceptable levels.
As I've been working with buyers in that price range, I can assure you the inventory is plentiful! There are also a great number of homes that you could purchase which are priced a bit beyond your price range, however have been on the market so long that it's possible you could purchase them at a price agreeable to your budget.
If you'd like to see the inventory for yourself, give me a call at 201-240-8699 and I can schedule a tour of not only homes, but areas you'd be interested in.
"Antoinette" Scognamiglio, GRI
Prudential New Jersey Properties / Morristown Office
Office: 973-538-5555 x 305