77 Ill. Adm. Code 890.1160
Potable Water Pumping and Storage Equipment
Section 890
Section 890.1160Â Potable
Water Pumping and Storage Equipment
a)        Pumps and Other Appliances. Potable water pumps, tanks,
filters, and all other appliances and devices shall be protected against
contamination.
b)        Water Supply Tanks. Potable water supply tanks shall be
properly covered to prevent contamination of the water supply. Soil or waste
lines shall not pass directly over such tanks.
c)        Cleaning, Painting, Repairing Water Tanks. A potable water
supply tank used for domestic purposes shall not be lined, painted or repaired
with any material which affects either the taste or the potability of the
water. Tanks shall be disconnected from the system during such operations to
prevent any foreign substance from entering the system.