Public water system · VA6107350
ActiveLoudoun Water - Central System
At a glance
Loudoun Water - Central System (PWSID VA6107350) is an active community water system in Loudoun County, Virginia. It reports serving 334,808 people through 83,426 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in October 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
334,808
Service connections
83,426
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Loudoun Water - Central System compare with other water systems in Loudoun County?
By EPA's size categories, Loudoun Water - Central System is a very large system (more than 100,000 people). Loudoun County has 92 active public water systems, and Loudoun Water - Central System is the largest of them by population served. Its population served is about 72 times the county average of 4,681 people per system, and accounts for 78% of the 430,687 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 Loudoun Water - Central System is about 50 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 110 Virginia systems (4.5%) list surface water as their primary source.
Who owns and regulates Loudoun Water - Central System?
EPA lists Loudoun Water - Central System 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. 14 of the 92 active systems in Loudoun County (15%) are also owned by a local government.
Does Loudoun Water - Central System have drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in October 2023. The violations listed here began between December 1984 and October 2023. By type: 10 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 9 as archived and 3 as resolved. 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. 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 |
|---|---|---|---|---|
| 2023-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2009-01-01 | Monitoring and reportingFailure Submit IDSE/Subpart V Plan Rpt · code 35 | Stage 2 Disinfectants and Disinfection Byproducts Rulecode 0600 | No | Resolved |
| 2001-07-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1993-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1993-02-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1984-12-01 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | Archived |
| 1984-12-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Archived |
| 1984-12-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Archived |
| 1984-12-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Archived |
| 1984-12-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 1984-12-01 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Archived |
| 1984-12-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | 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.
Loudoun Water - Central System: frequently asked questions
Who runs Loudoun Water - Central System?
Loudoun Water - Central System (PWSID VA6107350) is a community water system owned by a local government. It is regulated by the VA state drinking water program.
How many people does Loudoun Water - Central System serve?
Loudoun Water - Central System reports serving 334,808 people through 83,426 service connections in Loudoun County, Virginia.
Where does Loudoun Water - Central System get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Loudoun Water - Central System have any drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in October 2023. 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 Loudoun Water - Central 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. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in October 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the VA state drinking water program.
Where can I find Loudoun Water - Central System's water quality report?
As a community water system, Loudoun Water - Central 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 Loudoun County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Leesburg, Town of | Loudoun | 65,028 | Community | Surface water |
| Purcellville, Town of | Loudoun | 8,929 | Community | Surface water |
| Round Hill, Town of | Loudoun | 5,055 | Community | Groundwater |
| Lovettsville, Town of | Loudoun | 2,964 | Community | Groundwater |
| Hamilton, Town of | Loudoun | 2,240 | Community | Groundwater |
| Selma Estates | Loudoun | 1,540 | Community | Groundwater under influence of surface water |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Loudoun Water - Central System, PWSID VA6107350, Virginia”, https://aquacensus.com/water-systems/virginia/loudoun-water-central-system-va6107350 (data as of October 1, 2026).