Wisconsin Administrative Code › Department of Natural Resources › NR 800 - Environmental Protection - Water Supply › Chapter NR 809 - Safe Drinking Water › Subchapter VII - Public Notification of Drinking Water Violations › Section NR 809.951 - Tier 1 public notice - form, manner, and frequency of notice

Current through June 24, 2024
(1) VIOLATIONS OR
				  SITUATIONS WHICH REQUIRE A TIER 1 PUBLIC NOTICE.
(a) Appendix A identifies the tier assignment
				  for each specific violation or situation requiring a Tier 1 public
				  notice.
(b) Violation categories
				  and other situations requiring a Tier 1 public notice include all of the
				  following:
1. Violation of the MCL for
E. coli
, as specified in s.
				  NR
				  809.30.
2.
				  Violation of the MCL for nitrate, nitrite, or total nitrate and nitrite, as
				  defined in s.
				  NR
				  809.11, or when the water supplier for the public
				  water system fails to take a confirmation sample within 24 hours of the water
				  supplier's receipt of the first sample showing an exceedance of the nitrate or
				  nitrite MCL, as specified in s.
				  NR
				  809.115(6) (b).
3. Exceedance of the nitrate MCL by
				  non-community water systems, where permitted to exceed the MCL by the
				  department under s.
				  NR
				  809.11(3), as required under s.
				  NR
				  809.958.
4. Violation of the MRDL for chlorine
				  dioxide, as defined in s.
				  NR
				  809.561(2), 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 for the public water system does not take the required samples in the
				  distribution system, as specified in s.
				  NR
				  809.566(3) (b) 1.
5. Violation of the turbidity treatment
				  technique MCL under s.
				  NR
				  810.29(1), where the department
				  determines after consultation that a Tier 1 notice is required or where
				  consultation does not take place within 24 hours after the public water system
				  learns of the violation.
6.
				  Violation of the surface water treatment rule (SWTR) or interim enhanced
				  surface water treatment rule (IESWTR) treatment technique requirement resulting
				  from a single exceedance of the maximum allowable turbidity limit as identified
				  in Appendix A, if the department determines after consultation that a Tier 1
				  notice is required or if consultation does not take place within 24 hours after
				  the water supplier for the public water supply learns of the
				  violation.
7. Occurrence of a
				  waterborne disease outbreak, as defined in s.
				  NR
				  809.04(90), 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. 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
				  department either in its regulations or on a case-by-case basis.
9. Detection of
E. coli
,
				  enterococci, or coliphage in source water samples as specified under s.
				  NR
				  809.325(2).