ISLIP, N.Y. -- Some Suffolk County residents received grants to make environmental improvements to their homes, but then were shocked to learn it would count as taxable income.However, there is new hope for tax relief. As CBS2's Carolyn Gusoff reported Monday, thousands of taxpayers say they were slammed with higher taxes for doing the right thing.East Islip resident Louis Castronova upgraded his old septic system for one reason, but the nearly $30,000 fixes, paid for with grant money, ended up raising his taxes $4,000."That affected me as a middle class homeowner. This could have been college," Catronova said.READ MORE: IRS says...