NR 810.26 Note Note: Section 280.01 (5), Stats., defines “pump installing” to mean the industry and procedure employed in the placement and preparation for operation of equipment and materials utilized in withdrawing or obtaining water from a well for consumption or use, including all construction involved in making entrance to the well and establishing such seals and safeguards as are necessary to protect such water from contamination.

NR 810.26(5) (5) Well head protection plans. Water suppliers for community water systems with a department approved well head protection plan and ordinance shall implement it. Amended plans or ordinances shall be approved by the department prior to implementation.

NR 810.26(6) (6) Sampling and monitoring plans. Water suppliers shall develop sampling and monitoring plans as required by ss. NR 809.31 (1) (a), 809.325 (2) (c), and 809.565 (6).

NR 810.26(7) (7) Storage turnover. Storage facilities shall be operated to facilitate turnover of water in order to prevent freezing and stagnant water conditions. Consideration shall be given to installing separate inlet and outlet pipes, diffusers and baffle walls.

NR 810.26(8) (8) Emergency chlorination plans. An emergency chlorination plan is required for each community water system. Each municipal water system shall have appropriate chlorination infrastructure and chorine available to obtain 0.5 mg/l free chlorine throughout its distribution system within 4 hours. A working chlorine meter shall also be available to measure chlorine concentrations. To ensure water systems are capable of emergency chlorination, the department may ask that an emergency chlorination test be conducted by the water supplier for a municipal water system. At a minimum, the emergency chlorination plan shall include:

NR 810.26(8)(a) (a) Location and description of chlorine pumps, solution containers, chemical, and chlorine test meter.

NR 810.26(8)(b) (b) Procedures for adding chlorine to the water system, flushing the water system to move chlorine to extremities, and testing chlorine levels.

NR 810.26(8)(c) (c) Example calculations for determining dosage requirements.

NR 810.26 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; correction in (6) made under s. 13.92 (4) (b) 7., Stats., Register November 2010 No. 659.

subch. II of ch. NR 810 Subchapter II — Surface Water Treatment and Groundwater Under the Direct Influence of Surface Water Treatment Operations

NR 810.27 NR 810.27 General requirements for all surface water and groundwater under the direct influence of surface water systems.

NR 810.27(1) (1) This subchapter establishes criteria under which filtration is required as a treatment technique for public water systems supplied by a surface water source or a groundwater source under the direct influence of surface water. Direct influence shall be determined for individual sources by the department. The department determination of direct influence may be based on site-specific measurements of water quality characteristics such as those stated in s. NR 810.02 (25) or documentation of well construction characteristics and geology with field evaluation. These regulations also establish requirements for treatment techniques in lieu of maximum contaminant levels for Giardia lamblia, viruses, heterotrophic plate count bacteria, Legionella, Cryptosporidium and turbidity. Treatment technique requirements apply to every public water system which utilizes surface water or groundwater under the direct influence of surface water and the requirements consist of installing and properly operating water treatment processes which reliably achieve:

NR 810.27(1)(a) (a) At least 99.9% or 3-log removal or inactivation of Giardia lamblia cysts between a point where the raw water is not subject to recontamination by surface water runoff and a point downstream before or at the first customer.

NR 810.27(1)(b) (b) At least 99.99% or 4-log removal or inactivation of viruses between a point where the raw water is not subject to recontamination by surface water runoff and a point downstream before or at the first customer.

NR 810.27(1)(c) (c) At least 99.9% or 3-log removal of Cryptosporidium between a point where the raw water is not subject to recontamination by surface water runoff and a point downstream before or at the first customer for filtered systems, or Cryptosporidium control under the watershed control system for unfiltered GWUDI systems.

NR 810.27(2) (2) A public water system using a surface water source is considered to be in compliance with the requirements of sub. (1) if it meets the filtration requirements in s. NR 810.29 and the disinfection requirements in s. NR 810.31.

NR 810.27(3) (3) A public water system using groundwater under the direct influence of surface water is considered to be in compliance with the requirements or sub. (1) if it meets the criteria for avoiding filtration in s. NR 810.30 along with the disinfection requirements in s. NR 810.31; or if it meets the filtration requirements in s. NR 810.29 and it meets the disinfection requirements in s. NR 810.31.

NR 810.27(4) (4) Each public water system using a surface water source or a groundwater under the direct influence of surface water shall be operated by qualified personnel who meet the requirements specified by the department.

NR 810.27 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.

NR 810.28 NR 810.28 Requirements for covers on water storage structures. All finished water storage reservoirs and treatment plant basins shall be covered. Finished water is that water which has received all required treatment. Treatment plant basins contain water at various stages of treatment.

NR 810.28 History History: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.

NR 810.29 NR 810.29 Basic filtration requirements. Public water systems that use a surface water source shall provide filtration which complies with the requirements of sub. (1), (2), (3), (4), or (5) and meets the disinfection criteria specified in s. NR 810.31 (2). Public water systems that use a groundwater source under the direct influence of surface water shall provide filtration which complies with the specifications of sub. (1), (2), (3), (4) or (5) and meets the disinfection criteria specified in s. NR 810.31 (2) within 18 months of the date that a source is determined, by the department, to be under the direct influence of surface water unless they meet the filtration avoidance criteria in s. NR 810.30. Failure to meet the applicable requirements of this section is a treatment technique violation.

NR 810.29(1) (1) Conventional filtration treatment.

NR 810.29(1)(a) (a) For systems using conventional filtration treatment, the turbidity level of representative samples of a system’s filtered water shall be less than or equal to 0.3 nephelometric turbidity units (NTU) in at least 95% of the measurements taken each month, measured as specified in s. NR 809.113 (1) Tables A and B.

NR 810.29(1)(b) (b) The turbidity level of representative samples of a system’s filtered water may not exceed one NTU, measured as specified in s. NR 809.113 (1) Tables A and B.

NR 810.29(1)(c) (c) To determine compliance with par. (a), turbidity measurements shall be performed on representative samples of filtered water at least every 4 hours that the system serves water to the public.

NR 810.29(1)(d) (d) In lieu of the requirements of par. (c), turbidity measurements from a continuous reading and recording turbidity monitoring device shall be recorded at predetermined 4-hour intervals to determine compliance with par. (a). The highest turbidity measurement recorded at any time during the day shall be reported under s. NR 809.80 (7) (a) 1.

NR 810.29(1)(e) (e) A system that uses lime softening may acidify representative samples prior to analysis if using a protocol approved by the department.

NR 810.29(2) (2) Direct filtration.