Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 604 - DESIGN, OPERATION, AND MAINTENANCE CRITERIA
Subpart A - GENERAL PROVISIONS
Section 604.150 - Protection of Community Water Supply Structures

Source of Contamination

Distance for Clay or Loam Soils

Distances for Soils with Higher Permeability than Clay or Loam

Cesspools, leaching sewage disposal pits

150'

300'

Privies

150'

300'

Septic tanks and subsurface septic tanks effluent disposal tile

75'

150'

Livestock, grazing areas or feedlots

50'

100'

Sewers (non-watertight)

50'

50'

Sewers (cast iron pipe, with leaded or mechanical joints)

25'

25'

Sewers (extra-heavy cast iron pipe, asbestos-cement pressure pipe, prestressed concrete pipe, or PVC (polyvinyl chloride) pipe meeting water main standards, with pressure tested, leaded, mechanical or slip-on joints

10'

10'

Washwater sumps of reinforced concrete construction

10'

10'

Flood waters - A horizontal distance must be maintained by natural earth or fill. In addition, wells must meet the requirements of Section 604.240(k).

15'*

15'*

Flood waters - A vertical distance must be maintained to which structure and earth protection must be carried above maximum high water elevation. In addition, wells must meet the requirements of Section 604.240(k).

2'

2'

Fuel storage tanks above ground

25'**

25'**

* The Agency must consider special structural arrangements equivalent to earthen construction for protection of the well when horizontal earth protection is impractical.

** unless otherwise approved by the Agency under Section 604.145(b)