NR 810.02(23) (23) “Groundwater” means any of the waters of the state, as defined in s. 281.01 (18), Stats., occurring in a saturated subsurface geological formation of rock or soil.

NR 810.02(24) (24) “Groundwater source” means all groundwater obtained from horizontal collectors, infiltration lines, springs, and dug, drilled or other types of wells.

NR 810.02(25) (25) “Groundwater under the direct influence of surface water” or “GWUDI” means any water beneath the surface of the ground with either:

NR 810.02(25)(a) (a) Occurrence of insects or other macroorganisms, algae or large diameter pathogens such as Giardia lamblia or Cryptosporidium, in greater than or equal to 10% of representative source water samples collected over a period of 6 months, immediately prior to the first or only point of disinfectant application.

NR 810.02(25)(b) (b) Evidence of relatively rapid shifts in water characteristics such as turbidity, temperature, conductivity, or pH which closely correlate to climatological or surface water conditions where the department determines that these shifts are indications of the potential for contamination of the groundwater by the organisms identified in par. (a).

NR 810.02(26) (26) “Living unit” means a residence, apartment unit, condominium unit, duplex unit, manufactured home or other domicile.

NR 810.02(27) (27) “Membrane filtration” means a pressure or vacuum driven separation process in which particulate matter larger than one 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.

NR 810.02(28) (28) “Municipal water system” means a community water system owned by a city, village, county, town, town sanitary district, utility district, public inland lake and rehabilitation district, municipal water district or a federal, state, county or municipal owned institution for congregate care or correction, or a privately owned water utility serving the foregoing.

NR 810.02(29) (29) “Non-community water system” means a public water system that is not a community water system. A non-community water system may be either a non-transient non-community water system or a transient non-community water system.

NR 810.02(30) (30) “Non-transient non-community water system” or “NTNCWS” means a non-community water system that regularly serves at least 25 of the same persons over 6 months per year.

NR 810.02 Note Note: Examples of non-transient non-community water systems include those serving schools, day care centers and factories.

NR 810.02(31) (31) “NSF” or “NSF International” means the organization formerly known as the National Sanitation Foundation.

NR 810.02 Note Note: The NSF or NSF International address is PO Box 130140, 789 N. Dixboro Road, Ann Arbor, Michigan 48113-0140.

NR 810.02(32) (32) “Operator-in-charge” means the person designated by the owner of the waterworks to be in direct responsible charge of a subclass of operations of the waterworks. Not included in this definition are utility managers, city engineers, directors of public works or the equivalent, who are not actually involved in day-to-day operations.

NR 810.02(33) (33) “Other-than-municipal water system” or “OTM” means a community water system that is not a municipal water system.

NR 810.02(34) (34) “Person” means an individual, corporation, company, association, cooperative, trust, institution, partnership, state, municipality, or federal agency.

NR 810.02(35) (35) “Public water system” or “system” or “PWS” means a system for the provision to the public of piped water for human consumption through pipes or other constructed conveyances, if the system has at least 15 service connections or regularly serves an average of at least 25 individuals daily at least 60 days out of the year. A public water system is either a “community water system” or a “non-community water system”. A system:

NR 810.02(35)(a) (a) Includes any collection, treatment, storage and distribution facilities under the control of the operator of a system and used primarily in connection with the system.

NR 810.02(35)(b) (b) Includes any collection or pretreatment storage facilities not under the system’s control which are used primarily in connection with the system.

NR 810.02 Note Note: The definition of public water system as regulated by this chapter is broader and includes more water systems than those governed by the public service commission under its definition of a public utility in ch. 196, Stats.

NR 810.02(36) (36) “Residual disinfectant concentration” (“C” in CT calculations) means the concentration of disinfectant measured in mg/l in a representative sample of water.

NR 810.02(37) (37) “Reviewable project” has the same meaning as in s. NR 108.02 (13).

NR 810.02(38) (38) “SCADA” means Supervisory Control and Data Acquisition, a computer system used for gathering and analyzing real time data used to monitor and control water systems and their components.

NR 810.02(39) (39) “Slow sand filtration” means a process involving passage of raw water through a bed of sand at low velocity, generally less than 0.4 m/h, resulting in substantial particulate removal by physical and biological mechanisms.

NR 810.02(40) (40) “Surface water” means all water which is open to the atmosphere and subject to surface runoff.

NR 810.02(41) (41) “Surface water systems” means public water systems using surface water or groundwater under the direct influence of surface water as a source and that are subject to the requirements of 40 CFR 141, subpart H, P, and W, which contains the national primary drinking water regulations.

NR 810.02(42) (42) “Transient non-community water system” or “TNCWS” means a non-community water system that serves at least 25 people at least 60 days of the year but does not regularly serve at least 25 of the same persons over 6 months per year.

NR 810.02 Note Note: Examples of transient non-community water systems include those serving taverns, motels, restaurants, churches, campgrounds and parks.

NR 810.02(43) (43) “Unfiltered system” means a public water system using groundwater under the direct influence of surface water that is not a filtered system.