Ethylene Dibromide 0.0000004
Heptachlor Epoxide 0.000004
Polychlorinated biphenyls (PCBs) 0.000005
2,3,7,8-TCDD (Dioxin) 2 x 10-10
Vinyl chloride 0.000015
Atrazine, (total chlorinated residue)1 0.003
Asbestos 7 Million fibers/L
(longer than 10
Cyanide(as free Cyanide) 0.2
Nitrate 10 (as Nitrogen)
Nitrite 1 (as Nitrogen)
Nitrate+Nitrite 10 (as Nitrogen)
1 Atrazine, total chlorinated residue includes atrazine and its metabolites, diaminoatrazine, diethylatrazine and deisopropylatrazine.
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.
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:
The water supplier shall collect a confirmation sample to verify the presence of the contaminant, unless collected by the department.
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.
The department may require the water supplier to prepare and submit a report which does all of the following:
Analyzes the cost, effectiveness and feasibility of alternatives for treating the water or developing alternative water sources.
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.
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.
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.
Inorganic chemical maximum contaminant levels and BATs. NR 809.11(1)(1)
The following requirements apply to all of the maximum contaminant levels for inorganic contaminants:
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)
The maximum contaminant level for fluoride only applies to community water systems.
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.
Asbestos 7 Million fibers/Liter
(longer than 10 um)