Michigan Administrative Code › Department - Environmental Quality › Drinking Water And Municipal Assistance Division › Supplying Water to the Public › Part 1 - GENERAL PROVISIONS › Section R. 325.10106 - Definitions; M to O

Current through Vol. 24-12, July 15, 2024
Rule 106. As used in these rules:
(a) "Maximum residual disinfectant level
				  (MRDL)" means a level of a disinfectant added for water treatment that may not
				  be exceeded at the consumer's tap without an unacceptable possibility of
				  adverse health effects.
(b)
				  "Maximum TTHM potential" means the maximum concentration of total
				  trihalomethanes produced in a given water containing a disinfectant residual
				  after 7 days at a temperature of 25 degrees Centigrade or above.
(c) "MCL" means the maximum permissible level
				  of a contaminant in water that is delivered to any user of a public water
				  supply.
(d) "MDL" means method
				  detection limit for analytical work done to determine compliance with the
				  act.
(e) "Medium-size water system"
				  or "medium-size water supply," for the purpose of lead and copper control,
				  means a public water supply that serves more than 3,300 persons and fewer than
				  or equal to 50,000 persons.
(f)
				  "Membrane filtration" means a pressure or vacuum driven separation process in
				  which particulate matter larger than 1 micrometer is rejected by an engineered
				  barrier, primarily through a size-exclusion mechanism, and which has a
				  measurable removal efficiency of a target organism that can be verified through
				  the application of a direct integrity test. This definition includes the common
				  membrane technologies of microfiltration, ultrafiltration, nanofiltration, and
				  reverse osmosis.
(g) "Monitoring
				  requirement" means a schedule, frequency, and location for the sampling and
				  analysis of water that is required by the provisions of part 7 of these rules
				  to determine whether a public water supply is in compliance with the state
				  drinking water standards.
(h) "Near
				  the first service connection" means at 1 of the 20% of all service connections
				  in the entire system that are nearest the water supply treatment facility, as
				  measured by water transport time within the distribution system.
(i) "Noncommunity supply" or "noncommunity
				  water supply" or "noncommunity water system" means a public water supply that
				  is not a community supply, but that has not fewer than 15 service connections
				  or that serves not fewer than 25 individuals on an average daily basis for not
				  less than 60 days per year.
(j)
				  "Nontransient noncommunity water supply" or "nontransient noncommunity water
				  system" or "NTNC" means a noncommunity public water supply that serves not
				  fewer than 25 of the same individuals on an average daily basis over 6 months
				  per year. This definition includes water supplies in places of employment,
				  schools, and day-care centers.
(k)
				  "NTU" means nephelometric turbidity unit.
(l) "One hundred-year drought elevation"
				  means the minimum projected water surface elevation that would occur at a
				  location once in a period of 100 years.
(m) "One hundred-year flood elevation" means
				  the maximum projected water surface elevation that would occur at a location
				  once in a period of 100 years.
(n)
				  "Operating shift" means that period of time during which operator decisions
				  that affect public health are necessary for proper operation of the waterworks
				  system.
(o) "Operator" means an
				  individual who operates a waterworks system or a portion of a waterworks
				  system.
(p) "Operator in charge"
				  means a certified operator who is designated by the owner of a public water
				  supply as the responsible individual in overall charge of a waterworks system,
				  or portion of a waterworks system, who makes decisions regarding the daily
				  operational activities of the system that will directly impact the quality or
				  quantity of drinking water.
(q)
				  "Optimal corrosion control treatment," for the purpose of lead and copper
				  control, means the corrosion control treatment that minimizes the lead and
				  copper concentrations at users' taps while ensuring that the treatment does not
				  cause the public water supply to be in violation of any national primary
				  drinking water regulations.