77 Ill. Adm. Code 820.350
Operation Reports and Routine Sampling
Section 820
Section 820.350Â Operation
Reports and Routine Sampling
a)        Operation Reports. The swimming facility manager/operator
shall record operational data daily on a report form furnished by the
Department, or equivalent, that shall be kept at the facility for a minimum of 3
years for inspection by the Department. A separate report form shall be
completed for each pool or aquatic feature.
b)        Water Quality Testing. With the exception of bathing beaches,
disinfectant residual and pH tests shall be made on samples collected at least
twice daily from the shallow and deep areas of each pool, and from all other aquatic
features. If chlorine is used as a disinfectant, testing for combined chlorine
shall be performed at least weekly. If chlorinated cyanurates are used as a
chlorine disinfectant, testing for cyanuric acid concentration shall be
performed at least weekly.
c)Â Â Â Â Â Â Â Â If ozone is used, testing to determine the ozone concentration
immediately above the pool water surface shall be performed monthly.