Michigan Administrative Code › Department - Environmental Quality › Drinking Water And Municipal Assistance Division › Supplying Water to the Public › Part 4 - PUBLIC NOTIFICATION AND PUBLIC EDUCATION › Section R. 325.10402 - Tier 1 public notice; form, manner, and frequency of notice

Current through Vol. 24-12, July 15, 2024
Rule 402.
(1) A
				  tier 1 public notice is required for all of the following violation categories
				  and other situations in a community or noncommunity water supply that is
				  subject to
				  R 325.10401a:
(a) Violation of the MCL for total coliforms
				  when fecal coliform or E. coli are present in the water distribution system as
				  specified in
				  R 325.10602, or when the water
				  supply fails to test for fecal coliforms or E. coli when a repeat sample tests
				  positive for coliform as specified in
				  R 325.10707. Violation of the MCL
				  for E. coli, as specified in
				  R 325.10602.
(b) Violation of the MCL for nitrate,
				  nitrite, or total nitrate and nitrite, as defined in
				  R
				  325.10604c, or when the water supply fails to take a
				  confirmation sample within 24 hours of the water supply's receipt of the first
				  sample result showing an exceedance of the nitrate or nitrite MCL, as specified
				  in
				  R
				  325.10710(9)(b).
(c) Exceedance of the nitrate MCL by
				  noncommunity water supplies, where permitted to exceed the MCL by the
				  department, as required under
				  R 325.10408b.
(d) Violation of the MRDL for chlorine
				  dioxide, as defined in
				  R
				  325.10610a(1), when 1 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
				  supply does not take the required samples in the distribution system, as
				  specified in
				  R
				  325.10610b(3)(b).
(e) Violation of the treatment technique
				  requirement resulting from a single exceedance of the maximum allowable
				  turbidity limit under
				  R 325.10611b(1)
				  as identified in table 1 of
				  R 325.10401a, 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 supply learns of the
				  violation.
(f) Occurrence of a
				  waterborne disease outbreak 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.
(g) Detection of E.
				  coli, enterococci, or coliphage in source water samples as specified in
				  R 325.10739(1) and
				  (2).
(h) 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 these
				  rules or on a case-by-case basis. The tier assignment for each specific
				  violation or situation is listed in table 1 of
				  R 325.10401a.