Nev. Admin. Code § 445A.629 - Classification of public water systems

1. The Division shall classify all public water systems in this State pursuant to subsections 2 and 3.

2. A public water system which uses groundwater, surface water, groundwater under the direct influence of surface water or water provided by another public water system must be classified for distribution on a point system as follows:

ITEMS FOR DISTRIBUTION CLASSIFICATION	POINTS
Average daily population served
25 - 500 .................................................................................................................	......... 5
501 - 3,300 ............................................................................................................	......... 10
3,301 - 10,000 .......................................................................................................	......... 15
10,001 - 100,000 ...................................................................................................	......... 20
100,001 or more ....................................................................................................	......... 35
Pressure zones (1 point per zone, maximum of 5 points).........................................	......... 1
Storage reservoirs (1 point per reservoir, maximum of 5 points).............................	......... 1
Hydropneumatic tank systems ..................................................................................	......... 1
Pumping stations, including wells and boosters (1 point per station, maximum of 3 points) ................................................................................................................	......... 1
Disinfection to maintain system residual ..................................................................	......... 5
System control and data acquisition or other similar instrumentation to provide data or process control ..........................................................................................	......... 3
Existence of recycled or reclaimed water distribution system within drinking water service area .................................................................................................	......... 5

DISTRIBUTION CLASSIFICATION	TOTAL POINTS
Distribution-1 ........................................................................................................	5 - 19
Distribution-2 ........................................................................................................	20 - 30
Distribution-3 ........................................................................................................	31 - 41
Distribution-4 ........................................................................................................	42 or more

3. A public water system which:

(a) Uses surface water or groundwater under the direct influence of surface water; or

(b) Uses groundwater and provides treatment of the groundwater, other than disinfection by chlorination,

must be classified for treatment on a point system as follows:

ITEMS FOR TREATMENT CLASSIFICATION	POINTS
Average daily population served
25 - 500 ...............................................................................................................	........... 5
501 - 3,300 ..........................................................................................................	........... 10
3,301 - 10,000 .....................................................................................................	........... 15
10,001 - 100,000 .................................................................................................	........... 20
100,001 or more ..................................................................................................	........... 25
Source for public water system
Groundwater ..............................................................................................................	.... 3
Groundwater under the direct influence of surface water.........................................	.... 4
Surface water .............................................................................................................	.... 5
Air stripping ...................................................................................................................	.... 4
Ozone .............................................................................................................................	.... 8
Ultraviolet light ..............................................................................................................	.... 8
Combination of ozone and ultraviolet light ....................................................................	.... 10
Chemical addition for adjustments of pH ......................................................................	.... 4
Iron and manganese removal ..........................................................................................	.... 5
Iron and manganese sequestering ...................................................................................	.... 2
Softening - ion exchange, lime or lime soda ash process...............................................	.... 10
Granular activated carbon for organic contamination ....................................................	.... 7
Coagulation for pretreatment only .................................................................................	.... 5
Taste and odor control ....................................................................................................	.... 4
Fluoridation ....................................................................................................................	.... 5
Chlorine-ammonia treatment ..........................................................................................	.... 8
Chlorine dioxide .............................................................................................................	.... 8
Bacteriological or chemical laboratory (other than process control).............................	.... 2
Blending, aesthetic .........................................................................................................	.... 5
Blending, health effects ....................................................................................................	.. 8
Chlorine gas or hypochlorite ............................................................................................	.. 5
Chlorine gas or hypochlorite generated on-site ................................................................	.. 6
Chemical addition (1 point for each chemical added) ......................................................	.. 1
Primary inorganic chemical treatment .............................................................................	.. 8
Point-of-use ......................................................................................................................	.. 5
Nitrate or nitrite removal ..................................................................................................	.. 8
Adsorption process for aesthetics .....................................................................................	.. 3
Recycle filter backwash water to process .........................................................................	.. 3
Recycle supernatant from sludge removal and sedimentation process............................	.. 2
Recycle water from any mechanical dewatering process.................................................	.. 2
System control and data acquisition or other similar instrumentation to provide data or process control .................................................................................................	.. 3
Filtration
Conventional filtration-coagulation, flocculation, sedimentation...............................	.. 10
Direct filtration-coagulation, flocculation, sedimentation...........................................	.. 10
Rapid sand ...................................................................................................................	.. 7
Diatomaceous earth .....................................................................................................	.. 7
Slow sand .....................................................................................................................	.. 5
Bag, ceramic, microfiltration, nanofiltration, reverse osmosis, membrane, electro dialysis ..........................................................................................................	5

TREATMENT CLASSIFICATION	TOTAL POINTS
Treatment-1 ...............................................................................................	............ 5 - 19
Treatment-2 ...............................................................................................	............ 20 - 35
Treatment-3 ...............................................................................................	............ 36 - 45
Treatment-4 ...............................................................................................	............ 46 or more

4. The Division shall review the classification of every public water system not less than once every 3 years to determine whether the public water system continues to meet the criteria for that classification pursuant to this section. Upon a determination that the public water system no longer meets the criteria for the classification, the Division shall:

(a) Reclassify the public water system in accordance with the criteria for classification pursuant to this section;

(b) Deliver a written notification of the reclassification to the public water system on or before December 31 of the year in which the determination is made; and

(c) Require the public water system to comply with the requirements of the new classification within 18 months after the date the public water system receives the written notification of the determination by the Division.

5. As used in this section, "filtration" means a process for removing particulate matter from water by passing the water through porous media.

Notes

Nev. Admin. Code § 445A.629

Added to NAC by Bd. of Health, eff. 9-16-92; A by R185-99, 2-10-2000; R021-02, 8-29-2002; A by Environmental Comm'n by R129-05, 10-31-2005; A by R156-17AP, eff. 5/16/2018

NRS 445A.860, as amended by section 3 of Assembly Bill No. 50, chapter 70, Statutes of Nevada 2017, and NRS 445A.880