Environmental groups in Lake County?

Folks,

I'm wondering if you can offer me some help here. I'm interning with Habitat for Humanity in Lake County for this term at school. Habitat would like me to do some marketing for their "Re-Store" and to target enviro groups in Lake County. Personally, I'm not familiar with any organized groups in Lake Co, so I'm hoping you can provide me with some contact info. Either the names, phone numbers, emails or any combination of these.

What we are looking to do is to write a few letters to these groups and ask for their help in either supplying the store or being customers at the store. We'd like to establish an ongoing partnership with these groups as well. Thanks for your help.