Chapter NR 809

2,3,7,8-TCDD (Dioxin)   2 x 10-10

Tetrachloroethylene   0.0007

Thallium   0.0005

Toxaphene   0.00003

1,1,2-Trichloroethane   0.003

Trichloroethylene   0.003

Vinyl chloride   0.000015

NR 809.07(3) (3) MCLGs which equal the MCLs are as follows:

Atrazine, (total chlorinated residue)1   0.003

Antimony   0.006

Asbestos   7 Million fibers/L
  (longer than 10
  micrometers)

Barium   2

Beryllium   0.004

Cadmium   0.005

Carbofuran   0.04

Chromium   0.1

Copper   1.3

Cyanide(as free Cyanide)   0.2

2,4-D   0.07

Dalapon   0.2

o-Dichlorobenzene   0.6

para-Dichlorobenzene   0.075

1,1-Dichloroethylene   0.007

cis-1,2-Dichloroethylene   0.07

trans-1,2-Dichloroethylene   0.1

Dichloromethane   0.005

Di(2-ethylhexyl)adipate   0.4

Dinoseb   0.007

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)1. 1. Assesses the cause and significance of the problem.

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 809.07 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 15-049: am. (1) Register March 2016 No. 723, eff. 4-1-16.

NR 809.09 NR 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 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.

NR 809.10 NR 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 History History: CR 15-049: cr. Register March 2016 No. 723, eff. 4-1-16.

NR 809.11 NR 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(1)(d) (d) Compliance with maximum contaminant levels for inorganic chemicals is calculated under s. NR 809.117.

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: