Register January 2024 No. 817
Chapter NR 102
WATER QUALITY STANDARDS FOR WISCONSIN SURFACE WATERS
Subchapter I — General
NR 102.04 Categories of surface water uses and criteria.
NR 102.05 Application of standards.
NR 102.07 Assessing phosphorus concentration.
NR 102.10 Outstanding resource waters.
NR 102.11 Exceptional resource waters.
NR 102.12 Great Lakes system.
NR 102.13 Fish and aquatic life waters.
NR 102.14 Taste and odor criteria.
Subchapter II — Water Quality Standards for Temperature
NR 102.23 Categories of standards applicable to temperature.
NR 102.24 General water quality criteria for temperature.
NR 102.245 Temperature criteria for limited aquatic life communities.
NR 102.25 Ambient temperatures and water quality criteria for the protection of fish and other aquatic life.
NR 102.26 Site-specific ambient temperatures.
NR 102.27 Site-specific water quality criteria.
NR 102.28 Cold shock standard.
NR 102.29 Rate of temperature change standard.
NR 102.30 Variances to water quality standards for temperature.
Subchapter III — Waterbody Assessments and Reporting
NR 102.50 Waterbody assessments and reporting.
NR 102.51 Assessment types.
NR 102.52 Assessment protocols.
NR 102.53 Reporting, public participation, and approvals.
NR 102.54 Biological assessment of designated uses.
NR 102.55 Narrative biological assessment thresholds for aquatic life uses.
NR 102.56 Numeric biological assessment thresholds for lakes, reservoirs and impounded flowing waters.
NR 102.60 Combined assessment procedure for phosphorus.
Ch. NR 102 Note
Note: Chapter NR 102 as it existed on September 30, 1973 was repealed and a new chapter NR 102 was created, effective October 1, 1973.
Corrections made under s. 13.93 (2m) (b) 7., Stats.,
Register, August, 1997, No. 500.
NR 102.01(1)(1)
The purpose of this chapter is to establish, in conjunction with chs.
NR 103 to
105, water quality standards for surface waters of the state pursuant to s.
281.15, Stats. This chapter describes the designated use categories for such waters and the water quality criteria necessary to support these uses. This chapter
, chs.
NR 103 to
105, and ch.
NR 119 constitute the water quality standards for the surface waters of Wisconsin.
NR 102.01(2)
(2) The long-range goal of Wisconsin water quality standards is to protect the use of water resources for all lawful purposes. Water quality standards shall protect the public interest, which includes the protection of public health and welfare and the present and prospective uses of all waters of the state for public and private water supplies, propagation of fish and other aquatic life and wild and domestic animals, domestic and recreational purposes, and agricultural, commercial, industrial, and other legitimate uses. In all cases where the potential uses are in conflict, water quality standards shall protect the general public interest.
NR 102.01(3)
(3) Water quality standards serve as a basis for developing and implementing control strategies to achieve legislative policies and goals. Water quality standards are the basis for deriving water quality based effluent limitations and the limitations shall be determined to attain and maintain uses and criteria, unless more stringent effluent limitations are established to protect downstream waters. Water quality standards also serve as a basis for decisions in other regulatory, permitting or funding activities that impact water quality.
NR 102.02
NR 102.02 Applicability. The provisions of this chapter are applicable to surface waters of Wisconsin.
NR 102.02 History
History: Cr.
Register, February, 1989, No. 398, eff. 3-1-89.
NR 102.03
NR 102.03 Definitions. In this chapter, the following definitions apply:
NR 102.03(1)
(1) “Ambient temperature" means the typical existing temperature of a surface water outside the direct influence of any point source discharge, which may include daily and seasonal changes.
NR 102.03(1c)
(1c) “
Benthic” means relating to the ecological zone at the bottom of a body of water, including the sediment surface and subsurface layers.
NR 102.03(1e)
(1e)
“Biological assessment threshold” means a numeric value or condition description used to measure the quality of a waterbody's biological community and to determine attainment of its designated uses.
NR 102.03(1g)
(1g) “
Chlorophyll
a” means a green pigment present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis.
NR 102.03(1i)
(1i) “
Clean Water Act” means the federal Clean Water Act of 1972 and amendments.
NR 102.03(1k)
(1k) “
Confidence interval” means a range within which the true value of a parameter is likely to occur, with a specified level of confidence.
NR 102.03(1m)
(1m) “
Diatom” means a common and diverse group of unicellular algae of the phylum Chrysophyta, having cell walls containing silica.
NR 102.03(1o)
(1o) “
Drainage lake" means a lake with an outlet stream that continually flows under average summer conditions based on the past 30 years.
NR 102.03(1q)
(1q) “
Impounded flowing water” means a waterbody impounded by a constructed outlet structure on a river or stream that is not a reservoir as defined in sub.
(4s).
NR 102.03(1v)
(1v) “
Macrophyte” means an aquatic plant large enough to be seen without the use of a microscope.
NR 102.03(2)
(2) “Mixing zone" means a region in which a discharge of different characteristics than the receiving water is in transit and progressively diluted from the source to the receiving system.
NR 102.03(3)
(3) “Natural conditions" means the normal daily and seasonal variations in climatic and atmospheric conditions, and the existing physical and chemical characteristics of a water or the course in which it flows.
NR 102.03(4)
(4) “Natural temperature" means the normal existing temperature of a surface water including daily and seasonal changes outside the zone of influence of any artificial inputs.
NR 102.03(4e)
(4e) “PFOA” means perfluorooctanoic acid in its anionic, cationic, and acidic forms as well as any salts of perfluorooctanoic acid.
NR 102.03(4m)
(4m) “PFOS” means perfluorooctane sulfonate, including its anionic, cationic, and acidic forms as well as any salts of perfluorooctane sulfonate.
NR 102.03(4s)
(4s) “
Reservoir" means a waterbody with a constructed outlet structure intended to impound water and raise the depth of the water by more than two times relative to the conditions prior to construction of the dam, and that has a mean water residence time of 14 days or more under summer mean flow conditions using information collected over or derived for a 30 year period.
NR 102.03(5)
(5) “Resource management" means the application of control techniques to enhance or preserve a surface water in accordance with statutory provisions and in the general public interest.
NR 102.03(6)
(6) “
Section 303 (d) list” means a list of waters that do not attain water quality standards and require a total maximum daily load analysis, as specified under section 303 (d) of the Clean Water Act,
33 USC 1313 (d).
NR 102.03(6e)
(6e) “
Seepage lake" means a lake that does not have an outlet stream that continually flows under average summer conditions based on the past 30 years.
NR 102.03(6m)
(6m) “
Stratified lake or reservoir” means a lake or reservoir where sufficient field data demonstrate that the lake is dimictic or, in absence of sufficient field data, the following equation results in a value of greater than 3.8:
Maximum Depth (meters) - 0.1
Log10Lake Area (hectares)
NR 102.03(6s)
(6s)
“
Stratified two-story fishery lake” or “two-story fishery lake” means a lake greater than 5 acres in size that is typically stratified in the summer, with the potential for an oxygenated hypolimnion, that has documentation at any time since 1975 of a population of cold water fish species such as cisco, whitefish, or trout that is sustained through natural reproduction or long-term active stocking with year-to-year survival.
NR 102.03 Note
Note: A list of two-story fishery lakes that contain naturally reproducing lake trout, whitefish, or cisco, or are stocked and managed by the department for brook, brown, rainbow, or lake trout, is available on the department's designated uses website at
https://dnr.wi.gov/topic/SurfaceWater/usedesignations.html.
NR 102.03(7)
(7) “Surface waters" means all natural and artificial named and unnamed lakes and all naturally flowing streams within the boundaries of the state, but not including cooling lakes, farm ponds and facilities constructed for the treatment of wastewaters (the term waters as used in this chapter means surface waters).
NR 102.03(7m)
(7m) “
Total phosphorus" means all of the phosphorus in a water sample analyzed using the methods identified under the provisions of s.
NR 219.04 (1).
NR 102.03(8)
(8) “Unauthorized concentrations of substances" means pollutants or other chemicals introduced into surface waters without prior permit or knowledge of the department, but not including accidental or unintentional spills.
