Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 611 - PRIMARY DRINKING WATER STANDARDS › Subpart V - PUBLIC NOTIFICATION OF DRINKING WATER VIOLATIONS › Section 611.902 - Tier 1 Public Notice: Form, Manner, and Frequency of Notice

Current through Register Vol. 48, No. 28, July 12, 2024
a) Violations or Situations That Require a
				Tier 1 Public Notice. This subsection (a) lists the violation categories and
				other situations requiring a Tier 1 public notice. Appendix G identifies the
				tier assignment for each specific violation or situation. The violation
				categories include:
1) Violation of the MCL
				for E. coli (as specified in Section
				611.325(c)).
2) Violation of the MCL for nitrate, nitrite,
				or total nitrate and nitrite, as defined in Section
				611.301, or when the water
				supplier fails to take a confirmation sample within 24 hours after the
				supplier's receipt of the results from the first sample showing an exceedance
				of the nitrate or nitrite MCL, as specified in Section
				611.606(b).
3) Exceedance of the nitrate MCL by a non-CWS
				supplier, if permitted to exceed the MCL by the Agency under Section
				611.300(d), as
				required under Section
				611.909.
4) Violation of the MRDL for chlorine
				dioxide, as defined in Section
				611.313(a),
				when one or more samples taken in the distribution system the day following an
				exceedance of the MRDL at the entrance of the distribution system exceed the
				MRDL, or when the water supplier does not take the required samples in the
				distribution system, as specified in Section
				611.383(c)(2)(A).
5) This subsection (a)(5) refers to a
				violation of the former turbidity standard of Section
				611.320, which the Board
				repealed because it applied to no suppliers in Illinois. This statement
				maintains structural consistency with the federal regulations.
6) Violation of the Surface Water Treatment
				Rule (SWTR), Interim Enhanced Surface Water Treatment Rule (IESWTR), or Long
				Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR) treatment technique
				requirement resulting from a single exceedance of the maximum allowable
				turbidity limit (as identified in Appendix G), if the Agency determines after
				consultation that a Tier 1 public notice is required or if consultation does
				not take place within 24 hours after the supplier learns of the
				violation.
7) Occurrence of a
				waterborne disease outbreak, as defined in Section
				611.101, or other waterborne
				emergency (such as a failure or significant interruption in key water treatment
				processes, a natural disaster that disrupts the water supply or distribution
				system, or a chemical spill or unexpected loading of possible pathogens into
				the source water that significantly increases the potential for drinking water
				contamination).
8) Detection of E.
				coli, enterococci, or coliphage in source water samples, as specified in
				Section 611.802(a) and
				(b).
9) Other violations or situations with
				significant potential to have serious adverse effects on human health as a
				result of short-term exposure, as determined by the Agency in a SEP.
10) Exceeding the lead action level, as
				Section 141.80(c)
				specifies.