Public water system · NV0000032
ActiveDayton Valley Water System
At a glance
Dayton Valley Water System (PWSID NV0000032) is an active community water system in Lyon County, Nevada. It reports serving 16,000 people through 7,100 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; none is health-based, and the most recent began in February 1992.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
16,000
Service connections
7,100
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Dayton Valley Water System compare with other water systems in Lyon County?
By EPA's size categories, Dayton Valley Water System is a large system (10,001 to 100,000 people). Lyon County has 30 active public water systems, and Dayton Valley Water System is the 2nd-largest of them by population served. Its population served is about 9.4 times the county average of 1,710 people per system, and accounts for 31% of the 51,309 people reported by systems filed under the county. Across Nevada, the 643 active systems average 5,508 people each. Nationally, the average active community water system reports serving 6,703 people, so Dayton Valley Water System is about 139% above that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Nevada has 224 active community water systems, 35% of the state's 643 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 557 Nevada systems (87%) list groundwater as their primary source.
Who owns and regulates Dayton Valley Water System?
EPA lists Dayton Valley Water System as owned by a local government. The NV state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 6 of the 30 active systems in Lyon County (20%) are also owned by a local government.
Does Dayton Valley Water System have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in February 1992. The violations listed here began between January 1992 and February 1992. By type: 2 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 as archived. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1992-02-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1992-01-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 2 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Dayton Valley Water System: frequently asked questions
Who runs Dayton Valley Water System?
Dayton Valley Water System (PWSID NV0000032) is a community water system owned by a local government. It is regulated by the NV state drinking water program.
How many people does Dayton Valley Water System serve?
Dayton Valley Water System reports serving 16,000 people through 7,100 service connections in Lyon County, Nevada.
Where does Dayton Valley Water System get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Dayton Valley Water System have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in February 1992. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Dayton Valley Water System's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 2 violations for this system; none is health-based, and the most recent began in February 1992. For current results, consult the system's annual water quality report, EPA ECHO, or the NV state drinking water program.
Where can I find Dayton Valley Water System's water quality report?
As a community water system, Dayton Valley Water System must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Lyon County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Fernley Public Works | Lyon | 23,064 | Community | Groundwater |
| Yerington City of | Lyon | 5,050 | Community | Groundwater |
| Silver Springs Mutual Water Company | Lyon | 3,070 | Community | Groundwater |
| Stagecoach Gid | Lyon | 1,628 | Community | Groundwater |
| Smith Valley Baptist Church | Lyon | 500 | Transient non-community | Groundwater |
| Weed Heights Development | Lyon | 340 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Dayton Valley Water System, PWSID NV0000032, Nevada”, https://aquacensus.com/water-systems/nevada/dayton-valley-water-system-nv0000032 (data as of October 1, 2026).