Wisconsin Administrative Code › Department of Natural Resources › NR 800 - Environmental Protection - Water Supply › Chapter NR 810 - Requirements for the operation and maintenance of public water systems › Section NR 810.02 - Definitions

Current through June 24, 2024
In this chapter:
(1)
				"A.N.S.I." means the American National Standards Institute.
Note: The ANSI address is 25 West 43rd St, New York, NY
				  10036.
(2) "A.P.I." means
				the American Petroleum Institute.
Note: The API address is 1220 L Street NW, Washington, DC
				  20005-4070.
(3) "Approval"
				means the written approval of the department for any project requiring approval
				pursuant to s.
				281.41, Stats.,
				and s.
				NR
				108.03 for community systems, and s.
				NR 812.09
				for non-community systems.
(4)
				"ASTM" or "ASTM International" means the organization formerly known as the
				American Society for Testing and Material.
Note: The ASTM or ASTM International address is 100 Barr
				  Harbor Drive, PO Box C700, West Conshohocken, Pennsylvania 19148-2959.
(5) "A.W.W.A." means the American
				Water Works Association.
Note: The AWWA address is 6666 West Quincy Avenue, Denver,
				  Colorado 80235.
(6)
				"Community water system" means a public water system which serves at least 15
				service connections used by year-round residents or regularly serves at least
				25 year-round residents. Any water system serving 7 or more homes, 10 or more
				mobile homes, 10 or more apartment units, 10 or more duplex units, or 10 or
				more condominium units shall be considered a community water system unless
				information is provided by the owners indicating that 25 year-round residents
				will not be served.
(7)
				"Consecutive system" means a public water system that receives some or all of
				its finished water from one or more wholesale suppliers or wholesaler systems
				through a master metering system. This system may also be known as a wholesale
				purchaser or wholesale customer. Delivery may be through a direct connection or
				through the distribution system of one or more consecutive systems.
(8) "Conventional filtration treatment" means
				a series of processes including coagulation, flocculation, sedimentation, and
				filtration resulting in substantial particulate removal.
(9) "Cross connection" means a connection or
				potential connection between any part of a water supply system and another
				environment containing substances in a manner that, under any circumstances,
				would allow the substances to enter the water supply system by means of back
				siphonage or back pressure.
(10)
				"CT" or "CT calc" is the product of the residual disinfectant concentration (C)
				in mg/l determined before or at the first customer, and the corresponding
				disinfectant contact time (T) in minutes, for example, "C" x "T". If a public
				water system applies disinfectants at more than one point prior to the first
				customer, the water supplier shall determine the CT of each disinfectant
				sequence before or at the first customer, to determine the total percent
				inactivation or "total inactivation ratio." The inactivation ratio for a single
				disinfectant sequence is:
See
								Image
where "CTtable" is the CT value required for the target
				  organism and the target level of inactivation as contained in ss.
				  NR
				  810.47 to
				  810.61. The sum of the inactivation
				  ratios, or total inactivation ratio for a series of disinfection sequences
				  is:
See
								Image
and is calculated by adding together the inactivation ratio
				  for each disinfection sequence. In determining the total inactivation ratio,
				  the water supplier shall determine the residual disinfectant concentration of
				  each sequence and corresponding contact time before any subsequent disinfection
				  application points. A total inactivation ratio equal to or greater than 1.0 is
				  assumed to provide the target level of disinfection of the target
				  organism.
(11) "Department"
				means the department of natural resources.
(12) "Diatomaceous earth filtration" means a
				process resulting in substantial particulate removal in which all of the
				following occurs:
(a) A precoat cake of
				diatomaceous earth filter media is deposited on a support membrane or
				septum.
(b) While the water is
				filtered by passing through the cake on the septum, additional filter media
				known as body feed is continuously added to the feed water to maintain the
				permeability of the filter cake.