Search city, ZIP, contaminant⌘KFind my water
Updated 2026-10-15
County water report

Clark County Water Quality: 5 Cities Ranked by the Records

Clark County, Nevada: 5 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Clark County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 5 systems10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest248 µg/L
Water hardnessDetected in 1 systemAesthetic, no federal health limit · USGSHighest16.4 gpg
Total trihalomethanes (TTHM)Detected in 2 systems80 ppb federal MCL · US EPAHighest72 ppb
Haloacetic acids (HAA5)Detected in 2 systems60 ppb federal MCL · US EPAHighest44 ppb
CopperDetected in 1 system1.3 mg/L (action level) · US EPAHighest0.82 mg/L
Lead (90th percentile)Detected in 4 systems of 5 tested15 µg/L federal action level · US EPAHighest3.8 µg/L
ArsenicDetected in 1 system0.010 mg/L · US EPAHighest0.0019 mg/L
FluorideDetected in 1 system4.0 mg/L · US EPAHighest0.65 mg/L
3 more contaminants detectedShow
NitrateDetected in 1 system10 mg/L · US EPAHighest0.5 mg/L
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 5 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest5.6 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 1 system of 5 testedNo federal or state limit; shown for transparencyHighest4.8 ng/L
27 PFAS tested, none detected in any systemShow

Tested in these 5 systems: BOULDER CITY, HENDERSON CITY OF, LAS VEGAS VALLEY WATER DISTRICT, NORTH LAS VEGAS UTILITIES, VIRGIN VALLEY WATER DISTRICT

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorobutanesulfonic acid (PFBS)
  • Perfluorobutanoic acid (PFBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorohexanesulfonic acid (PFHxS)
  • Perfluorononanoic acid (PFNA)
  • Perfluorooctanesulfonic acid (PFOS)
  • Perfluorooctanoic acid (PFOA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
5 cities

Cities ranked by the records

Showing 5 of 5 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Clark CountyPFAS detected in 1 of 5 cities; none had a sample above a 2024 EPA limit
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Nevada
Lead

0of 5 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Nevada
Hard water

2cities report hardness · hardest Henderson, 17.8 gpg

2 of 2 are hard on the USGS scale. An aesthetic measure with no federal health limit.

Hard water explained
Who supplies the county

Largest water systems

  1. Las VegasLAS VEGAS VALLEY WATER DISTRICT · NV0000090
    1,539,277 served
  2. North Las VegasNORTH LAS VEGAS UTILITIES · NV0000175
    376,515 served
  3. HendersonHENDERSON CITY OF · NV0000076
    336,534 served
  4. MesquiteVIRGIN VALLEY WATER DISTRICT · NV0000167
    26,000 served
  5. Boulder CityBOULDER CITY · NV0000011
    15,000 served
Questions

Frequently asked

How does Clark County tap water compare across cities?

PurityMap ranks 5 cities in Clark County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Mesquite's main water system: VIRGIN VALLEY WATER DISTRICT · PWSID NV0000167 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Clark County cities had a PFAS sample above a 2024 EPA limit?

None of the 5 Clark County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 1.

Is there lead in Clark County tap water?

Utilities report lead as a 90th-percentile result from home taps. 4 of 5 Clark County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Does Clark County have hard water?

Hardness is published in utility water-quality reports for 2 Clark County cities on record; the hardest is Henderson at 17.8 grains per gallon. Hardness affects scale and appliances; it is not a health finding.

Next step

Follow Clark County's water

Get an email when a city record in the county changes.

Find my water
FOLLOW THIS COUNTY

Record changes only

We email when places in Clark County get new results. Unsubscribe any time.

Follow Clark County's water →