TTHM (Total Trihalomethanes) violations in Nevada
34 active public water systems in Nevada had a TTHM (Total Trihalomethanes) violation in the past three years, 1 of them in the latest quarter of EPA's data. What TTHM (Total Trihalomethanes) is and why it matters.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Rosemount Water CO Washoe County |
54 | 6 | 5 | |
|
Venetian Palazzo Clark County |
19,387 | 2 | 0 | |
|
Nellis Air Force Base Clark County |
19,081 | 1 | 0 | |
|
Riverside Resort Clark County |
3,732 | 1 | 0 | |
|
M Resort Spa and Casino Clark County |
3,550 | 5 | 2 | |
|
Fallon Naval Air Station Fallon Naval Air Station · Churchill County |
3,000 | 1 | 0 | |
|
Hawthorne Utilities Hawthorne · Mineral County |
2,876 | 1 | 0 | |
|
Gold Country Estates Humboldt County |
1,695 | 2 | 0 | |
|
Stagecoach Gid Lyon County |
1,628 | 6 | 0 | |
|
Wyndham Grand Desert Clark County |
1,291 | 1 | 0 | |
|
Jackpot Water System Jackpot · Elko County |
1,240 | 3 | 1 | |
|
Marriott Grand Chateau Clark County |
1,228 | 2 | 0 | |
|
Zephyr Cove Water Utility Distr Zephyr Cove · Douglas County |
1,209 | 1 | 0 | |
|
Hilton Grand Vacations Convention Clark County |
982 | 2 | 0 | |
|
Nevada State Veterans Home Boulder City Clark County |
708 | 4 | 1 | |
|
Walker River Paiute Tribe Walker River · County |
662 | 10 | 2 | |
|
Nps Cottonwood Cove Cottonwood Cove · Clark County |
592 | 4 | 1 | |
|
Hillcrest Manor Water Users Association Clark County |
450 | 3 | 0 | |
|
Walker Lake Gid Mineral County |
450 | 2 | 1 | |
|
Empire Mining Company Empire · Washoe County |
350 | 3 | 0 | |
|
Elk Point Country Club Douglas County |
325 | 5 | 1 | |
|
Sandy Valley Schools ES MS Ccsd Clark County |
230 | 5 | 3 | |
|
Jarbidge Water System Jarbidge · Elko County |
200 | 1 | 0 | |
|
Pumpkin Hollow Shaft Site Lyon County |
200 | 3 | 1 | |
|
Rancho Cooperative Water Company Clark County |
112 | 1 | 0 | |
|
Carson River Estates Churchill County |
105 | 11 | 0 | |
|
Kennametal INC Churchill County |
75 | 3 | 0 | |
|
Tuscarora Water System Elko County |
72 | 1 | 0 | |
|
Rancho Vista 4 Nye County |
50 | 6 | 2 | |
|
Palm Gardens Water CO OP Clark County |
42 | 4 | 1 | |
|
South Fork (te-Moak) South Fork Band · County |
40 | 7 | 2 | |
|
Diamond Plastics Humboldt County |
38 | 5 | 0 | |
|
Goodsprings ES Clark Community Center Clark County |
25 | 4 | 3 | |
|
Scppa Apex Generating Station Clark County |
25 | 1 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Nevada records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.