Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 611 - PRIMARY DRINKING WATER STANDARDS › Subpart B - FILTRATION AND DISINFECTION › Section 611.261 - Unfiltered PWSs: Reporting and Recordkeeping

Current through Register Vol. 48, No. 28, July 12, 2024
A supplier using a groundwater source under the direct
				  influence of surface water not providing filtration treatment must report
				  monthly to the Agency the information this Section specifies beginning six
				  months after the Agency determines that the groundwater source is under the
				  direct influence of surface water. When the Agency issues a SEP requiring
				  filtration treatment and specifying appropriate alternative reporting
				  requirements until the supplier applies filtration treatment.
a) The supplier must report source water
				quality information to the Agency within ten days after the end of each month
				the supplier serves water to the public. The information must include certain
				information:
1) The cumulative number of
				months for which the supplier reports results.
2) The number of fecal or total coliform
				samples, whichever the supplier analyzed during the month (if a supplier
				monitors for both, the supplier needs only report fecal coliform samples), the
				dates the supplied collected the samples, and the dates when the turbidity
				level exceeded 1 NTU.
3) The number
				of samples during the month that had equal to or fewer than 20/100 ml fecal
				coliforms or equal to or fewer than 100/100 ml total coliforms, whichever the
				supplier analyzed.
4) The
				cumulative number of fecal or total coliform samples, whichever the supplier
				analyzed, during the previous six months the supplier served water to the
				public.
5) The cumulative number of
				samples that had equal to or fewer than 20/100 ml fecal coliforms or equal to
				or fewer than 100/100 ml total coliforms, whichever the supplier analyzed,
				during the previous six months the supplier served water to the
				public.
6) The percentage of
				samples that had equal to or fewer than 20/100 ml fecal coliforms or equal to
				or fewer than 100/100 ml total coliforms, whichever the supplier analyzed,
				during the previous six months the supplier served water to the
				public.
7) The maximum turbidity
				level the supplier measured during the month, the dates of occurrence for any
				measurements exceeding 5 NTU, and the dates the supplier reported the
				occurrences to the Agency.
8) For
				the first 12 months of recordkeeping, the dates and cumulative number of events
				during which the turbidity exceeded 5 NTU. After one year of recordkeeping for
				turbidity measurements, the dates and cumulative number of events during which
				the turbidity exceeded 5 NTU in the previous 12 months the supplier served
				water to the public.
9) For the
				first 120 months of recordkeeping, the dates and cumulative number of events
				during which the turbidity exceeded 5 NTU. After ten years of recordkeeping for
				turbidity measurements, the dates and cumulative number of events during which
				the turbidity exceeded 5 NTU in the previous 120 months the supplier served
				water to the public.