How do I find a lawyer to help me file a Lead Case if I can't afford to hire a lawyer?

Need lawyer to help file case against a housing complex where I used to live. I moved in November of 2015 because my son was getting sick. Come to find out that everyone where i was staying had to relocate because of lead. They gave everyone section 8. So i tried to apply because they put an article in the newspaper saying that if you moved before July 22 of 2016 because of health related issues or have a child 6 years of age or younger you could receive a voucher. Well my 6 year old son has asthma and his lead level is 4 but when i went to ask about the section 8 program the manager over section 8 said it has to be 5 or higher. 4 is high enough now im thinking if i wasn't living there would my child have any health problems. Please help me