HUD sets Income Limits for each area based on the median family income in that area. Each Public Housing Agency PHA will use the Income Limit set for the jurisdiction that the PHA covers. Therefore, a family be eligible for one PHA but not another. The number of people in a household determines the Income Limit that is set for determining the family s eligibility for the program that they are applying for. Below are the Income Limits for McHenry County, IL: Median Income. $76, 000. CWEYF Crystal Terrace apartments is an affordable rental housing community located in Crystal Lake, IL. Crystal Terrace apartments is an affordable housing community with 1 Beds to 3 Beds apartments units. Income restrictions apply, please contact Crystal Terrace apartments for rates, availability and more information or compare to other apartments in Crystal Lake from the results below.