[quote author="EvaLSeraphim" date=1209765992]I was just thinking this morning that given that so much of the land in OC was agricultural before it was housing, there are probably a fair number of chemicals in the land a lot of the homes are sitting on. For example, DDT was often used as an agricultural pesticide and was not banned until 1972.
Paging Mr. No_Vaseline. Can you enlighten us about agricultural pesticides?</blockquote>
I'll try. It won't hurt you. There, I said it.
Seriously, groundwater contaimination from ag pesticides is very difficult to do because the material is applied in such miniscule quantities. Contamination from irrigation runoff is another matter.
<a href="http://en.wikipedia.org/wiki/Kesterson_Reservoir">When irrigation drainage projects go unfinished, bad things happen.</a>
OC was never flood irrigated the way they do in the San Joaquin valley, and if it was, it all found its way out to the Pacific via the Santa Ana river, so we're probablly ok. Believe it or not, farmers are pretty good stewards of the land. They want to continue to farm and that entails not poisioning thier property. Chemicals are an economic (consumers won't eat ugly fruit) and saftey (you like worms in your tomatos?) driven necessity. They also cost a boatload of money.