Wisconsin Administrative Code › Department of Natural Resources › NR 800 - Environmental Protection - Water Supply › Chapter NR 810 - Requirements for the operation and maintenance of public water systems › Subchapter I - General Operations › Section NR 810.09 - General treatment and disinfection requirements

Current through June 24, 2024
Department approved treatment shall be provided and
					 operated by each water supplier where necessary in order to ensure that the
					 finished water supplied to consumers meets the primary maximum contaminant
					 levels contained in ch. NR 809 and the design standards contained in ch. NR
					 811, where applicable. In addition, all of the following requirements shall be
					 met:
(1) CHEMICAL TREATMENT.
(a) All existing and new municipal water
				  systems and all other-than-municipal water systems constructed or modified
				  after December 1, 2010, shall be provided with equipment and the necessary
				  appurtenances which can continuously disinfect the water. The department may
				  require the installation of disinfection equipment at existing
				  other-than-municipal water systems where deemed necessary to ensure a safe
				  water supply. Standby disinfection equipment shall be periodically checked and
				  repaired, if necessary, to ensure it will work when it is required.
(b) All surface water treatment plants and
				  other waterworks where treatment is required to produce a water quality meeting
				  the primary maximum contaminant levels shall be equipped with backup chemical
				  feed equipment for all chemicals required for treatment in the event of failure
				  of the primary equipment.
(c)
				  Written approval from the department is required prior to the addition of any
				  chemical to a community water system. Non-community water systems shall refer
				  to s.
				  NR
				  812.37 for plan approval requirements for chemical
				  feed systems. At public water systems that treat continuously, a 30-day supply
				  of chemicals shall be kept on hand as required by s.
				  NR
				  108.06(3). The 30-day supply shall be
				  based on average day demand and average dose. Chemicals shall meet current
				  A.W.W.A. standards and be approved by the department. Department approval may
				  consist of, but is not limited to, certification of the chemical for use in
				  potable water under NSF/ANSI Standard 60. Those chemical suppliers relabeling
				  or repackaging NSF/ANSI 60 certified chemicals shall also be certified.
				  Laboratories evaluating products for compliance with NSF/ANSI Standard 60 shall
				  be certified by the American National Standards Institute. Colored chemicals
				  shall be approved if coloring agents are not used in toxic concentrations or in
				  amounts which impart taste, odor or color to the water supply. The department
				  may require the analysis of chemicals if necessary to insure use of safe
				  chemicals.
Note: Copies of these standards are available for
					 inspection at the office of the Department of Natural Resources and the
					 Legislative Reference Bureau.
Note: The Department of Safety and Professional Services
					 requires plan submittal and approval of all treatment systems installed to
					 service non-community water systems and designed to reduce health-related
					 contaminants. For more information, see s.
					 SPS
					 382.20.
(d) Chemical containers shall be labeled to
				  include the chemical name, purity, concentration, and name and address of the
				  chemical supplier.
(e) Requests for
				  the substitution of disinfection agents in lieu of chlorine for bacteriological
				  control shall be submitted to the department for review. Substitute
				  disinfection agents may not be used without specific approval by the
				  department.
(f) Solution tanks
				  shall be maintained in a sanitary condition.
(g) The department may require an assay of
				  chemicals delivered.
(h) A material
				  safety data sheet (MSDS) shall be obtained by the water supplier from the
				  chemical supplier for every chemical.