Section 620.201  Groundwater Designations

All groundwaters of the State are designated as:

a)         One of the following four classes of groundwater under Sections 620.210 through 620.240:

1)         Class I:  Potable Resource Groundwater;

2)         Class II:  General Resource Groundwater;

3)         Class III:  Special Resource Groundwater; or

4)         Class IV:  Other Groundwater;

b)         A groundwater management zone established under Section 620.250; or

c)         A groundwater management zone established under 35 Ill. Adm. Code 740.530. See Section 620.250(h)-(j).

(Source:  Amended at 49 Ill. Reg. 4488, effective March 28, 2025)