Public water system · NV0004021
ActiveSilver Knolls Mutual Water Company
At a glance
Silver Knolls Mutual Water Company (PWSID NV0004021) is an active community water system in Washoe County, Nevada. It reports serving 120 people through 63 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 12 are health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
120
Service connections
63
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Silver Knolls Mutual Water Company compare with other water systems in Washoe County?
By EPA's size categories, Silver Knolls Mutual Water Company is a very small system (500 people or fewer). Washoe County has 64 active public water systems. Its population served is well below the county average of 7,708 people per system, and accounts for less than 0.1% of the 493,331 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 Silver Knolls Mutual Water Company is well below 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 Silver Knolls Mutual Water Company?
EPA lists Silver Knolls Mutual Water Company as privately owned. 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. 43 of the 64 active systems in Washoe County (67%) are also privately owned.
Does Silver Knolls Mutual Water Company have drinking water violations?
Of the 12 most recent violations in EPA's records, 12 are health-based, and the most recent began in January 2026. The violations listed here began between April 2023 and January 2026. By type: 12 contaminant level above the legal limit. The contaminant or rule involved most often is Arsenic (12 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2026-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2025-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2025-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2025-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2025-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2024-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2024-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2024-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2024-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2023-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2023-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
| 2023-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Archived |
The 12 most recent 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.
Silver Knolls Mutual Water Company: frequently asked questions
Who runs Silver Knolls Mutual Water Company?
Silver Knolls Mutual Water Company (PWSID NV0004021) is a community water system privately owned. It is regulated by the NV state drinking water program.
How many people does Silver Knolls Mutual Water Company serve?
Silver Knolls Mutual Water Company reports serving 120 people through 63 service connections in Washoe County, Nevada.
Where does Silver Knolls Mutual Water Company 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 Silver Knolls Mutual Water Company have any drinking water violations?
Of the 12 most recent violations in EPA's records, 12 are health-based, and the most recent began in January 2026. 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 Silver Knolls Mutual Water Company'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. Of the 12 most recent violations in EPA's records, 12 are health-based, and the most recent began in January 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the NV state drinking water program.
Where can I find Silver Knolls Mutual Water Company's water quality report?
As a community water system, Silver Knolls Mutual Water Company 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 Washoe County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Truckee Meadows Water Authority | Washoe | 442,000 | Community | Surface water |
| Sun Valley Gid | Washoe | 17,000 | Community | Purchased surface water |
| Great Basin Water Co Cold Springs | Washoe | 9,910 | Community | Groundwater |
| Incline Village Gid | Washoe | 9,313 | Community | Surface water |
| Great Basin Water Co Spanish Springs | Washoe | 1,450 | Community | Groundwater |
| Truckee Canyon | Washoe | 1,016 | Non-transient non-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, “Silver Knolls Mutual Water Company, PWSID NV0004021, Nevada”, https://aquacensus.com/water-systems/nevada/silver-knolls-mutual-water-company-nv0004021 (data as of October 1, 2026).