Nebraska Administrative Code
Topic - HEALTH AND HUMAN SERVICES SYSTEM
Title 179 - PUBLIC WATER SYSTEMS
Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT
Section 179-25-023 - REPORTING REQUIREMENTS
Current through September 17, 2024
023.01 Systems must report sampling schedules and source water monitoring results unless they notify the Department that they will not conduct source water monitoring due to meeting monitoring avoidance criteria.
023.02 Filtered systems must report their Cryptosporidium bin classification as described in 179 NAC 25-012.
023.03 Unfiltered systems must report their mean source water Cryptosporidium level as described in 179 NAC 25-014.
023.04 Systems must report disinfection profiles and benchmarks to the Department as described in 179 NAC 25-010 through 25-011 prior to making a significant change in disinfection practice.
023.05 Systems must report to the Department in accordance with the following table for any microbial toolbox options used to comply with treatment requirements under 179 NAC 25-013 or 25-014. Alternatively, the Department may approve a system to certify operation within required parameters for treatment credit rather than reporting monthly operational data for toolbox options.
Microbial Toolbox Reporting Requirements
| Toolbox Option | Systems must submit the following information | On the following schedule |
| 1. Watershed control program (WCP) |
(i) Notice of intention to develop a new or continue an existing watershed control program (ii) Watershed control plan (iii) Annual watershed control program status report (iv) Watershed sanitary survey report |
(i) No later than two years before the applicable treatment compliance data in 179 NAC 25-015. (ii) No later than one year before the applicable treatment compliance date in 179 NAC 25-015. (iii) Every 12 months, beginning one year after the applicable treatment compliance date in179 NAC 25-015. (iv) For community water systems, every three years beginning three years after the applicable treatment compliance date in 179 NAC 25-015. For non-community water systems, every five years beginning five years after the applicable treatment compliance date in 179 NAC 25-015. |
| 2. Alternative source/intake management | Verification that system has relocated the intake or adopted the intake withdrawal procedure reflected in monitoring results | No later than the applicable treatment compliance date in 179 NAC 25-015. |
| 3. Presedimentation | Monthly verification of the following: (i) Continuous basin operation (ii) Treatment of 100% of the flow (iii) Continuous addition of a coagulant (iv) At least 0.5-log mean reduction of influent turbidity or compliance with alternative Department-approved performance criteria. | Monthly reporting within 10 days following the month in which the monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
| 4. Two-stage lime softening | Monthly verification of the following: (i) Chemical addition and hardness precipitation occurred in two separate and sequential softening stages prior to filtration (ii) Both stages treated 100% of the plant flow | Monthly reporting within 10 days following the month in which the monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
| 5. Bank filtration |
(GWR) : (ii) If monthly average of daily maximum turbidity is greater than 1 NTU, then system must report result and submit an assessment of the cause. |
No later than the applicable treatment compliance date in 179 NAC 25-015. Report within 30 days following the month in which the monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
| 6. Combined filter performance | Monthly verification of combined filter effluent (CFE) turbidity levels less than or equal to 0.15 NTU in at least 95% of the 4 hour CFE measurements taken each month | Monthly reporting within 10 days following the month in which the monitoring was conducted, beginning on the applicable treatment compliance date in179 NAC 25-015. |
| 7. Individual filter performance | Monthly verification of the following: (i) Individual filter effluent (IFE) turbidity levels less than or equal to 0.15 NTU in at least 95% of samples each month in each filter (ii) No individual filter greater than 0.3 NTU in two consecutive readings 15 minutes apart | Monthly reporting within 10 days following the month in which the monitoring was conducted, beginning on the applicable treatment compliance date in179 NAC 25-015. |
| 8. Demonstration of performance |
(i) Results from testing following a Department approved protocol (ii) As required by the Department, monthly verification of operation within conditions of Department approval for demonstration of performance credit |
No later than the applicable treatment compliance date in 179 NAC 25-015. Within 10 days following the month in which monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
| 9. Bag filters and cartridge filters. |
(i) Demonstration that the following criteria are met: (a) Process meets the definition of bag or cartridge filtration; (b) Removal efficiency established through challenge testing that meets criteria in 179 NAC 25. (ii) Monthly verification that 100% of plant flow was filtered. |
No later than the applicable treatment compliance date in 179 NAC 25-015. Within 10 days following the month in which monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
| 10. Membrane filtration |
(i) Results of verification testing demonstrating the following: (a) Removal efficiency established through challenge testing that meets criteria in 179 NAC 25; (b) Integrity test method and parameters, including resolution, sensitivity, test frequency, control limits, and associated baseline. (ii) Monthly report summarizing the following: (a) All direct integrity tests above the control limit; (b) If applicable, any turbidity or alternative Department-approved indirect integrity monitoring results triggering direct integrity testing and the corrective action that was taken. |
No later than the applicable treatment compliance date in 179 NAC 25-015. Within 10 days following the month in which monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
| 11. Second stage filtration | Monthly verification that 100% of flow was filtered through both stages and that first stage was preceded by coagulation step. | Within 10 days following the month in which monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
| 12. Slow sand filtration (as secondary filter) | Monthly verification that both a slow sand filter and a preceding separate stage of filtration treated 100% of flow from surface water or GWUDI | Within 10 days following the month in which monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
| 13. Chlorine dioxide | Summary of CT values for each day as described in 179 NAC 25-023. | Within 10 days following the month in which monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
| 14. Ozone | Summary of CT values for each day as described in 179 NAC 25-023. | Within 10 days following the month in which monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
| 15. UV |
(i) Validation test results demonstrating operating conditions that achieve required UV dose. (ii) Monthly report summarizing the percentage of water entering the distribution system that was not treated by UV reactors operating within validated conditions for the required dose as specified in 179 NAC 25-023.04. |
No later than the applicable treatment compliance date in 179 NAC 25-015. Within 10 days following the month in which monitoring was conducted, beginning on the applicable treatment compliance date in 179 NAC 25-015. |
