Nevada tap water quality

212 active community water systems.

Largest water systems

GradeSystemPeopleHealth violations (5y)
ALas Vegas Valley Water District1,539,2770
DTruckee Meadows Water Authority (TMWA)442,0000
ACity of North Las Vegas Utilities376,5150
ACity of Henderson Utility Services336,5340
ACarson City Public Works59,0000
AVirgin Valley Water District26,0000
CFernley Public Works23,0641
DCity of Elko23,0000
BNellis Air Force Base19,0811
ASun Valley Gid17,0000
ADayton Valley Water System16,0000
ABoulder City15,0000
AGreat Basin Water Company12,2550
AGardnerville Ranchos Gid11,3000
BGreat Basin Water Co Cold Springs9,9101
AGreat Basin Water Co Spring Creek9,3400
AIncline Village Gid9,3130
ACity of Fallon9,1840
ABig Bend Water District9,0000
ACity of Winnemucca8,5180
AMoapa Valley Water District8,5000
DPrimm Valley Casino Resorts7,00012
ADouglas County Carson Valley System6,4880
ASouthern Desert Correctional Ctr Ndoc6,2000
AIndian Hills Gid5,9620
AGardnerville Water Company5,8000
CCity of Yerington5,0501
BEly Municipal Water Department5,0000
AWest Wendover Water System4,5350
AMountain Falls Water System Gbwc4,3450
BKingsbury Gid3,8390
AGreat Basin Water Co Spring Creek MHP3,6400
BLander Co Sewer and Water Dist 1 Bm3,6351
ALovelock Meadows Water District3,5620
BTown of Minden3,5000
ASilver Springs Mutual Water Company3,0700
AFallon Naval Air Station3,0000
AHawthorne Utilities2,8760
ATonopah Public Utilities2,8530
ACarlin Utilities2,5000
ASignature Towers2,3560
CLas Vegas Paiute Snow Mountain2,3401
AGold Country Estates1,6950
ALovelock Correctional Center Ndoc1,6300
CStagecoach Gid1,6282
CTopaz Ranch Estates Gid and Water Co1,5451
AGreat Basin Water Co Spanish Springs1,4500
AStorey County Water District1,4200
ACanyon Gid1,3100
AWells Municipal Water Department1,3000

Most issues (systems serving 10,000+)

D

City of Elko

Serves 23,000 people · Groundwater · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; PFOA/PFOS average above the 4 ppt federal limit: PFOA, PFOS; Other PFAS above 2024 limits (rule proposed for repeal): PFHxS, Hazard Index; Lead 90th percentile below the action level (2025).
D

Truckee Meadows Water Authority (TMWA)

Serves 442,000 people · Surface water · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS, PFOA; Other PFAS above 2024 limits (rule proposed for repeal): PFHxS, Hazard Index; Lead 90th percentile below the action level (2025).
C

Fernley Public Works

Serves 23,064 people · Groundwater · Full report →
1 health-based violation in the last 5 years; 1 monitoring/reporting violation; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2023).
B

Nellis Air Force Base

Serves 19,081 people · Surface water · Full report →
1 health-based violation in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

Gardnerville Ranchos Gid

Serves 11,300 people · Groundwater · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2022).
A

Carson City Public Works

Serves 59,000 people · Surface water · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
A

Great Basin Water Company

Serves 12,255 people · Groundwater · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

Las Vegas Valley Water District

Serves 1,539,277 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

City of North Las Vegas Utilities

Serves 376,515 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A

City of Henderson Utility Services

Serves 336,534 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

Virgin Valley Water District

Serves 26,000 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A

Sun Valley Gid

Serves 17,000 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A

Dayton Valley Water System

Serves 16,000 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
A

Boulder City

Serves 15,000 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).

Cities

AlamoAustinBakerBattle MountainBeattyBlue DiamondBoulder CityBunkervilleCal Nev AriCalienteCambell RanchCarlinCarson CityCarson ColonyCaseltonCold CreekCrescent ValleyCrystal BayDaytonDeethDuckwaterElkoElyEmpireEurekaFallonFallon Naval Air StationFallon Paiute CommunityFernleyFort McDermittGabbsGardnervilleGardnerville RanchosGerlachGlenbrookGolcondaGoldfieldHarris SpringsHawthorneHendersonHolbrook JunctionHungry ValleyImlayIncline VillageIndian SpringsJackpotJarbidgeJeanKingsburyKyle CanyonLamoilleLas VegasLas Vegas ColonyLas Vegas Snow MountainLaughlinLogandaleLovelockLuningManhattanMc DermittMc GillMcDermittMcGillMesquiteMinaMindenMoapaMontelloMoundhouseMountain CityMt CharlestonNellis AfbNewtownNorth Las VegasOrovadaOvertonOwyheePahrumpPanacaPine GrovePiochePleasant ValleyRenoReno-Sparks Indian ColonyRound MountainRuthSchurzSearchlightSheridanSilver CitySilver SpringsSilverpeakSkylandSloanSouth Fork BandSparksSpring CreekStatelineSun ValleyTopazTuscaroraValmyVerdiVirginia CityWadsworthWalker RiverWashoe ValleyWellingtonWellsWest WendoverWinnemuccaWoodfordsYeringtonYomba Shoshone TribeZephyr Cove