Nebraska Administrative Code
Topic - HEALTH AND HUMAN SERVICES SYSTEM
Title 179 - PUBLIC WATER SYSTEMS
Chapter 17 - INTERIM ENHANCED SURFACE WATER TREATMENT (SYSTEMS SERVING 10,000 OR MORE PEOPLE)
Section 179-17-005 - FILTRATION

Universal Citation: 179 NE Admin Rules and Regs ch 17 ยง 005

Current through September 17, 2024

A public water system subject to the requirements of 179 NAC 17 that does not meet all of the criteria in this section and 179 NAC 13 for avoiding filtration must provide treatment consisting of both disinfection, as specified in 179 NAC 13-005.01, and filtration treatment which complies with the requirements of 179 NAC 17-005.01 or 17-005.02 or 179 NAC 13-006.02 or 13-006.03 by December 31, 2001, which is included for informational purposes only.

005.01 Conventional Filtration Treatment or Direct Filtration

17-005.01A For systems using conventional filtration or direct filtration, the turbidity level of representative samples of a system's filtered water must be less than or equal to 0.3 NTU in at least 95% of the measurements taken each month, measured as specified in 179 NAC 13-007.01 and 13-007.03.

17-005.01B The turbidity level of representative samples of a system's filtered water must at no time exceed 1 NTU, measured as specified in 179 NAC 13-007.01 and 13-007.03.

17-005.01C A system that uses lime softening may acidify representative samples prior to analysis using a protocol approved by the Department.

005.02 Filtration Technologies Other Than Conventional Filtration Treatment, Direct Filtration, Slow Sand Filtration, or Diatomaceous Earth Filtration

A public water system may use a filtration technology not listed in 179 NAC 17-005.01 or in 179 NAC 13-006.02 or 13-006.03 if it demonstrates to the Department, using pilot plant studies or other means, that the alternative filtration technology, in combination with disinfection treatment that meets the requirements of 179 NAC 13-005.02, consistently achieves 99.9 % removal and/or inactivation of Giardia lamblia cysts and 99.99 % removal and/or inactivation of viruses, and 99% removal Cryptosporidium oocysts, and the Department approves the use of the filtration technology. For each approval, the Department will set turbidity performance requirements that the system must meet at least 95% of the time and that the system may not exceed at any time at a level that consistently achieves 99.9 % removal and/or inactivation of Giardia lamblia cysts, 99.99 % removal and/or inactivation of viruses, and 99% removal of Cryptosporidium oocysts.

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