Public water system · VA6059550
ActiveHerndon, Town of
At a glance
Town of Herndon (PWSID VA6059550) is an active community water system in Fairfax County, Virginia. It reports serving 24,601 people through 5,595 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is health-based, and the most recent began in September 2007.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
24,601
Service connections
5,595
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Town of Herndon compare with other water systems in Fairfax County?
By EPA's size categories, Town of Herndon is a large system (10,001 to 100,000 people). Fairfax County has 43 active public water systems, and Town of Herndon is the 5th-largest of them by population served. Its population served is about 20% below the county average of 30,570 people per system, and accounts for 1.9% of the 1,314,517 people reported by systems filed under the county. Across Virginia, the 2,420 active systems average 3,122 people each. Nationally, the average active community water system reports serving 6,703 people, so Town of Herndon is about 3.7 times 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. Virginia has 844 active community water systems, 35% of the state's 2,420 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 162 Virginia systems (6.7%) list purchased surface water as their primary source.
Who owns and regulates Town of Herndon?
EPA lists Town of Herndon as owned by a local government. The VA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 20 of the 43 active systems in Fairfax County (47%) are also owned by a local government.
Does Town of Herndon have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in September 2007. By type: 1 contaminant level above the legal limit. The contaminant or rule involved is Total coliform bacteria (TCR). EPA lists 1 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2007-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
The one violation in EPA's records.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.
Town of Herndon: frequently asked questions
Who runs Town of Herndon?
Town of Herndon (PWSID VA6059550) is a community water system owned by a local government. It is regulated by the VA state drinking water program.
How many people does Town of Herndon serve?
Town of Herndon reports serving 24,601 people through 5,595 service connections in Fairfax County, Virginia.
Where does Town of Herndon get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Town of Herndon have any drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in September 2007. 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 Town of Herndon'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 one violation for this system; it is health-based, and the most recent began in September 2007. For current results, consult the system's annual water quality report, EPA ECHO, or the VA state drinking water program.
Where can I find Town of Herndon's water quality report?
As a community water system, Town of Herndon 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 Fairfax County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Fairfax County Water Authority | Fairfax | 1,121,613 | Community | Surface water |
| Dulles Airport | Fairfax | 76,500 | Non-transient non-community | Purchased surface water |
| Fort Belvoir | Fairfax | 39,303 | Community | Purchased surface water |
| Vienna, Town of | Fairfax | 27,134 | Community | Purchased surface water |
| Fort Belvoir North Area | Fairfax | 11,822 | Non-transient non-community | Purchased surface water |
| Mount Vernon | Fairfax | 3,000 | 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, “Herndon, Town of, PWSID VA6059550, Virginia”, https://aquacensus.com/water-systems/virginia/herndon-town-of-va6059550 (data as of October 1, 2026).