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Community Water System · PWS NV0000162

McDermitt Water System

Winnemucca, Nevada 89445 - drinking water served from groundwater sources to 200 people, tracked in EPA SDWIS and UCMR5.

200
People served
242
EPA violations
134
Health-based
Untested
UCMR5 result

The verdict

EPA records 242 drinking-water violations at McDermitt Water System, 55% of them health-based - above the Nevada per-system average.

242
Total EPA violations on record
55%
Health-based (MCL / treatment failure)
200
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: McDermitt Water System

McDermitt Water System is a local-owned community water system that delivers drinking water to 200 residents in Winnemucca, Nevada (Humboldt County) through 110 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 242 total violations for this system , of which 134 (55%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 88 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Arsenic, recorded in 107 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Nevada, EPA tracks 589 public water systems serving 3,455,285 people, with 56,333 cumulative violations and 6,657 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 95.6 violations. Statewide, 50 of 57 UCMR5-tested systems have reported PFAS detections (87.7%).

McDermitt Water System's 242 violations sit above the Nevada average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
200
Total Violations
242
Health-Based Violations
134
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
110
County
Humboldt
School/Daycare
No
MCL Violations
134
Monitoring Violations
88
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 107 2021
Coliform (TCR) MCL 27 2015
Coliform (TCR) MR 10 2015
1,2,4-Trichlorobenzene MR 3 2000
cis-1,2-Dichloroethylene MR 3 2000
o-Dichlorobenzene MR 3 2000
p-Dichlorobenzene MR 3 2000
1,1-Dichloroethylene MR 3 2000
1,2-Dichloroethane MR 3 2000
Carbon tetrachloride MR 3 2000
CHLOROBENZENE MR 3 2000
Benzene MR 3 2000
Toluene MR 3 2000
Styrene MR 3 2000
Di(2-ethylhexyl) phthalate MR 3 2001
Revised Total Coliform Rule MON 3 2019
DICHLOROMETHANE MR 3 2000
Xylenes, Total MR 3 2000
Vinyl chloride MR 3 2000
Arsenic MR 3 2021
trans-1,2-Dichloroethylene MR 3 2000
Trichloroethylene MR 3 2000
2,3,7,8-TCDD MR 3 2015
1,1,2-Trichloroethane MR 3 2000
1,2-Dichloropropane MR 3 2000
Tetrachloroethylene MR 3 2000
Ethylbenzene MR 3 2000
Chlorine MR 3 2020
1,1,1-Trichloroethane MR 3 2000
Consumer Confidence Rule Other 1 1999

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for McDermitt Water System.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID NV0000162 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Nevada Drinking Water Authority

Nevada's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find NV regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2021 Arsenic MCL 107 SDWIS / NV0000162 / 1005
2021 Arsenic MR 3 SDWIS / NV0000162 / 1005
2020 Chlorine MR 3 SDWIS / NV0000162 / 0999
2019 Revised Total Coliform Rule MON 3 SDWIS / NV0000162 / 8000
2015 Coliform (TCR) MCL 27 SDWIS / NV0000162 / 3100
2015 Coliform (TCR) MR 10 SDWIS / NV0000162 / 3100
2015 2,3,7,8-TCDD MR 3 SDWIS / NV0000162 / 2063
2001 Di(2-ethylhexyl) phthalate MR 3 SDWIS / NV0000162 / 2039
2000 1,2,4-Trichlorobenzene MR 3 SDWIS / NV0000162 / 2378
2000 cis-1,2-Dichloroethylene MR 3 SDWIS / NV0000162 / 2380
2000 o-Dichlorobenzene MR 3 SDWIS / NV0000162 / 2968
2000 p-Dichlorobenzene MR 3 SDWIS / NV0000162 / 2969
2000 1,1-Dichloroethylene MR 3 SDWIS / NV0000162 / 2977
2000 1,2-Dichloroethane MR 3 SDWIS / NV0000162 / 2980
2000 Carbon tetrachloride MR 3 SDWIS / NV0000162 / 2982

How McDermitt Water System Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric McDermitt Water System Nevada avg Federal benchmark
Total violations 242 95.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 134 11.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 87.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 200 5,866 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 589 regulated public water systems in Nevada.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is McDermitt Water System water safe to drink? ▼
McDermitt Water System (PWS ID: NV0000162) has 242 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 200 people using Groundwater sources.
How many people does McDermitt Water System serve? ▼
McDermitt Water System serves 200 people in Winnemucca, Nevada. It is a Local-owned system using Groundwater water sources with 110 service connections.
What type of violations does McDermitt Water System have? ▼
McDermitt Water System has 242 total violations: 134 health-based violations (MCL exceedances or treatment failures), 88 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in McDermitt Water System water? ▼
No PFAS testing data is available for McDermitt Water System under the EPA's UCMR5 monitoring program.
What water source does McDermitt Water System use? ▼
McDermitt Water System uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.