All 34 systems had enough required samples to calculate a yearly average. 3 had at least one yearly average at or above a study benchmark; 31 did not.
EPA-based study benchmark: the unrounded cutoff this research uses to reproduce EPA’s January 2026 technical-assistance classification around the April 2024 federal levels. It is not a current standard or compliance finding and cannot determine household exposure or health risk.
Find your water system
ZIP codes are used only to route visitors to public water systems that reported serving them. Confirm the actual provider using a water bill or utility record.
System counts in Nevada
Each count shows how many included water systems had a yearly average at or above the named study benchmark.
| Study benchmark | Systems at or above benchmark | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt) | 2 | 34 | 5.9% |
| PFOS: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt) | 3 | 34 | 8.8% |
| PFHxS: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 1 | 34 | 2.9% |
| PFNA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 34 | 0.0% |
| HFPO-DA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 34 | 0.0% |
| Hazard Index: 1.5 study benchmark with at least two detected components (reproduces EPA classification around 1) | 1 | 34 | 2.9% |
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had all required samples needed for a yearly average. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | Study benchmark result |
|---|---|---|---|---|---|
| BIG BEND WATER DISTRICT | NV0004092 | 9,000 | Surface water | 1 | Below all study benchmarks |
| BOULDER CITY | NV0000011 | 15,000 | Surface water purchased | 1 | Below all study benchmarks |
| CARSON CITY PUBLIC WORKS | NV0000015 | 59,000 | Surface water | 7 | Below all study benchmarks |
| CHIPMUNK RETREAT | NV0002554 | 45 | Ground water | 1 | Below all study benchmarks |
| DAYTON VALLEY WATER SYSTEM | NV0000032 | 16,000 | Ground water | 8 | Below all study benchmarks |
| EAST VALLEY WATER SYSTEM | NV0002216 | 6,488 | Ground water | 1 | Below all study benchmarks |
| ELKO CITY OF | NV0000272 | 23,000 | Ground water | 19 | At or above a study benchmark |
| ELY MUNICIPAL WATER DEPARTMENT | NV0000038 | 5,000 | Ground water | 6 | Below all study benchmarks |
| FALLON CITY OF | NV0000045 | 9,184 | Ground water | 1 | Below all study benchmarks |
| FERNLEY PUBLIC WORKS | NV0000062 | 23,064 | Ground water | 1 | At or above a study benchmark |
| GARDNERVILLE RANCHOS GID | NV0000066 | 11,300 | Ground water | 7 | Below all study benchmarks |
| GARDNERVILLE WATER COMPANY | NV0000065 | 5,800 | Ground water | 8 | Below all study benchmarks |
| GREAT BASIN WATER CO COLD SPRINGS | NV0000207 | 9,910 | Ground water | 5 | Below all study benchmarks |
| GREAT BASIN WATER CO SPRING CREEK | NV0000036 | 9,340 | Ground water | 9 | Below all study benchmarks |
| GREAT BASIN WATER CO SPRING CREEK MHP | NV0005027 | 3,640 | Ground water | 3 | Below all study benchmarks |
| GREAT BASIN WATER COMPANY | NV0000270 | 12,255 | Ground water | 5 | Below all study benchmarks |
| HENDERSON CITY OF | NV0000076 | 336,534 | Surface water purchased | 2 | Below all study benchmarks |
| INDIAN HILLS GID | NV0000355 | 5,962 | Ground water | 5 | Below all study benchmarks |
| KINGSBURY GID | NV0000004 | 3,839 | Surface water | 1 | Below all study benchmarks |
| LANDER CO SEWER AND WATER DIST 1 BM | NV0000008 | 3,635 | Ground water | 4 | Below all study benchmarks |
| LAS VEGAS VALLEY WATER DISTRICT | NV0000090 | 1,539,277 | Surface water purchased | 20 | Below all study benchmarks |
| LOVELOCK MEADOWS WATER DISTRICT | NV0000161 | 3,562 | Ground water | 3 | Below all study benchmarks |
| MOAPA VALLEY WATER DISTRICT | NV0000160 | 8,500 | Ground water | 3 | Below all study benchmarks |
| MOUNTAIN FALLS WATER SYSTEM GBWC | NV0000920 | 4,345 | Ground water | 2 | Below all study benchmarks |
| NELLIS AIR FORCE BASE | NV0003028 | 19,081 | Surface water purchased | 3 | Below all study benchmarks |
| NORTH LAS VEGAS UTILITIES | NV0000175 | 376,515 | Surface water purchased | 4 | Below all study benchmarks |
| SAND CREEK | NV0000406 | 953 | Ground water | 1 | Below all study benchmarks |
| SUN VALLEY GID | NV0000211 | 17,000 | Surface water purchased | 1 | Below all study benchmarks |
| TOWN OF MINDEN | NV0000168 | 3,500 | Ground water | 9 | Below all study benchmarks |
| TRUCKEE MEADOWS WATER AUTHORITY | NV0000190 | 442,000 | Surface water | 68 | At or above a study benchmark |
| VIRGIN VALLEY WATER DISTRICT | NV0000167 | 26,000 | Ground water | 7 | Below all study benchmarks |
| WEST WENDOVER WATER SYSTEM | NV0000246 | 4,535 | Ground water | 1 | Below all study benchmarks |
| WINNEMUCCA CITY OF | NV0000248 | 8,518 | Ground water | 6 | Below all study benchmarks |
| YERINGTON CITY OF | NV0000255 | 5,050 | Ground water | 2 | Below all study benchmarks |
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. This does not mean every home was tested. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system. This page does not apply Nevada's state-specific standards or determine compliance. Use the official state or territory drinking-water program for current regulatory information.