Diquat 0.02
Endothall 0.1
Endrin 0.002
Ethylbenzene 0.7
Fluoride 4.0
Glyphosate 0.7
Hexachlorocyclopentadiene 0.05
Lindane 0.0002
Mercury 0.002
Methoxychlor 0.04
Monochlorobenzene 0.1
Nickel 0.1
Nitrate 10 (as Nitrogen)
Nitrite 1 (as Nitrogen)
Nitrate+Nitrite 10 (as Nitrogen)
Oxamyl 0.2
Picloram 0.5
Selenium 0.05
Simazine 0.004
Styrene 0.1
Toluene 1
1,2,4-Trichlorobenzene 0.07
1,1,1-Trichloroethane 0.2
1 Atrazine, total chlorinated residue includes atrazine and its metabolites, diaminoatrazine, diethylatrazine and deisopropylatrazine.
NR 809.07(4)(4) If a contaminant is not detected in a sample and if the limit of detection is higher than the MCLG, the MCLG shall be considered not to have been exceeded. NR 809.07(5)(5) Notwithstanding any other provisions of this chapter, if a contaminant listed in sub. (2) is detected at a concentration above the MCLG but below the MCL for that contaminant, the following shall apply: NR 809.07(5)(a)(a) The water supplier shall collect a confirmation sample to verify the presence of the contaminant, unless collected by the department. NR 809.07(5)(b)(b) Based upon verified results and following a determination by the department on the need for further action as specified in par. (c), the water supplier shall provide public information to its customers indicating the analytical results achieved and the health effects of ingesting the substance at the concentration found. NR 809.07(5)(c)(c) The department may require the water supplier to prepare and submit a report which does all of the following: NR 809.07(5)(c)2.2. Analyzes the cost, effectiveness and feasibility of alternatives for treating the water or developing alternative water sources. NR 809.07(5)(d)(d) If, based on the conclusions of the report if required under par. (c), the department determines that action is necessary to protect public health, it may require the water supplier to treat or replace the water source. NR 809.09NR 809.09 Applicability of primary maximum contaminant levels to water sources. Except as otherwise allowed in this chapter, no water source exceeding any primary maximum contaminant level in this chapter may be connected to a public water system unless blending or treatment is provided such that the primary maximum contaminant level is not exceeded upon entry to the distribution system. NR 809.09 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10. NR 809.10NR 809.10 Use of bottled water. Public water systems may not use bottled water to achieve compliance with an MCL. Bottled water may be used temporarily to avoid unreasonable risk to health. NR 809.10 HistoryHistory: CR 15-049: cr. Register March 2016 No. 723, eff. 4-1-16. NR 809.11NR 809.11 Inorganic chemical maximum contaminant levels and BATs. NR 809.11(1)(1) Applicability. The following requirements apply to all of the maximum contaminant levels for inorganic contaminants: NR 809.11(1)(a)(a) The maximum contaminant levels for nitrate and nitrite apply to both community water systems and non-community water systems, except as provided in sub. (3). NR 809.11(1)(b)(b) The maximum contaminant level for fluoride only applies to community water systems. NR 809.11(1)(c)(c) The maximum contaminant levels for antimony, arsenic, asbestos, barium, beryllium, cadmium, chromium, cyanide, mercury, nickel, selenium and thallium apply to community water systems and non-transient, non-community water systems. NR 809.11(2)(2) MCLs for inorganics. The following are the maximum contaminant levels for inorganic contaminants: Antimony 0.006
Arsenic 0.010
Asbestos 7 Million fibers/Liter
(longer than 10 um)
Barium 2
Beryllium 0.004
Cadmium 0.005
Chromium 0.1
Cyanide(as free Cyanide)0.2
Fluoride 4.0
Mercury 0.002
Nickel 0.1
Nitrate 10 (as Nitrogen)
Nitrite 1 (as Nitrogen)
Total Nitrate Nitrite 10 (as Nitrogen)
Selenium 0.05
Thallium 0.002
NR 809.11(3)(3) Operation with nitrates not exceeding 20 mg/l. At the discretion of the department, nitrate as nitrogen levels not to exceed 20 mg/l may be allowed in a non-community water system if the water supplier demonstrates all of the following to the satisfaction of the department: NR 809.11(3)(a)(a) The water will not be available to children under 6 months of age or any female who is or may become pregnant. NR 809.11(3)(b)(b) The water supplier meets the public notification requirements under s. NR 809.958, including continuous posting of the fact that nitrate as nitrogen levels exceed 10 mg/l and the potential health effects of exposure. NR 809.11(3)(c)(c) Local and state public health authorities will be notified annually of nitrate as nitrogen levels that exceed 10 mg/l. NR 809.11(3)(d)(d) A supply of bacteriologically safe drinking water, containing less than 10 mg/l nitrate as nitrogen, is provided for infants less than 6 months of age and any female who is or may become pregnant. NR 809.11(4)(4) Best available treatment. The best available treatment technologies for inorganic contaminants are as follows: NR 809.11(4)(a)(a) The best available technologies or BATs for achieving compliance with the maximum contaminant levels for the inorganic contaminants listed in sub. (2), except for fluoride, are as follows: NR 809.11 NoteKey to BATs in Table:
NR 809.11 Note1 = Activated Alumina
NR 809.11 Note2 = Coagulation/Filtration (not BAT for public water systems < 500 service connections)
NR 809.11 Note3 = Direct and Diatomite Filtration
NR 809.11 Note4 = Granular Activated Carbon
NR 809.11 Note5 = Ion Exchange
NR 809.11 Note6 = Lime Softening (not BAT for public water systems < 500 service connections)
NR 809.11 Note7 = Reverse Osmosis
NR 809.11 Note8 = Corrosion Control
NR 809.11 Note9 = Electrodialysis
NR 809.11 Note10 = Oxidation (Chlorine)
NR 809.11 Note11 = Ultraviolet
NR 809.11 Note12 = Oxidation/Filtration
NR 809.11 Note13 = Alkaline Chlorination (pH ³ 8.5)
NR 809.11(4)(b)(b) A water supplier may use an alternative treatment not listed in par. (a) if it is demonstrated to the department, using pilot studies or other means, that the alternative treatment is sufficient to achieve compliance with the MCLs in sub. (2). NR 809.11(5)(5) Small water system compliance technologies for Arsenic. NR 809.11(5)(a)(a) The EPA identifies the following table as the affordable technology, treatment technique, or other means available to public water systems serving 10,000 persons or fewer for achieving compliance with the maximum contaminant level for arsenic:
