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Community Water System · PWS VA6033425

Lake Caroline

Rockville, Virginia 23146 - drinking water served from surface water sources to 2,933 people, tracked in EPA SDWIS and UCMR5.

2,933
People served
468
EPA violations
294
Health-based
Untested
UCMR5 result

The verdict

EPA records 468 drinking-water violations at Lake Caroline, 63% of them health-based - above the Virginia per-system average.

468
Total EPA violations on record
63%
Health-based (MCL / treatment failure)
2,933
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lake Caroline

Lake Caroline is a private-owned community water system that delivers drinking water to 2,933 residents in Rockville, Virginia (Caroline County) through 1,173 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 468 total violations for this system , of which 294 (63%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 161 monitoring and reporting violations are on file. The most recent violation on record dates to 2012.

The most frequently cited contaminant at this system is Total Haloacetic Acids (HAA5), recorded in 117 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 Virginia, EPA tracks 2,821 public water systems serving 7,911,199 people, with 146,670 cumulative violations and 25,642 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 52 violations. Statewide, 70 of 171 UCMR5-tested systems have reported PFAS detections (40.9%).

Lake Caroline's 468 violations sit above the Virginia 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
2,933
Total Violations
468
Health-Based Violations
294
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
1,173
County
Caroline
School/Daycare
No
MCL Violations
233
Monitoring Violations
161
Treatment Tech Violations
61

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Total Haloacetic Acids (HAA5) MCL 117 2009
TTHM MCL 116 2009
CARBON, TOTAL TT 57 2009
Arsenic MR 17 1985
Cadmium MR 17 1985
Chromium MR 17 1985
Mercury MR 17 1985
Selenium MR 17 1985
Barium MR 17 1985
Fluoride MR 16 1985
Nitrate MR 16 1985
Interim Enhanced Surface Water Treatment Rule MR 6 2005
Coliform (TCR) MR 5 1995
Lead and Copper Rule TT 4 1996
TTHM MR 4 2009
Total Haloacetic Acids (HAA5) MR 4 2009
Consumer Confidence Rule Other 4 2012
Toxaphene MR 1 1980
Gross Alpha, Excl. Radon and U MR 1 1977
Endrin MR 1 1980
Combined Radium (-226 and -228) MR 1 1977
2,4-D MR 1 1980
BHC-GAMMA MR 1 1980
Methoxychlor MR 1 1980
2,4,5-TP MR 1 1980

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 Lake Caroline.

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 VA6033425 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Virginia Drinking Water Authority

Virginia Department of Health, Office of Drinking Water is the primacy agency that licenses and inspects Lake Caroline under EPA-delegated authority.

Open VA regulator portal

Source: Virginia Department of Health, Office of Drinking Water

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
2012 Consumer Confidence Rule Other 4 SDWIS / VA6033425 / 7000
2009 Total Haloacetic Acids (HAA5) MCL 117 SDWIS / VA6033425 / 2456
2009 TTHM MCL 116 SDWIS / VA6033425 / 2950
2009 CARBON, TOTAL TT 57 SDWIS / VA6033425 / 2920
2009 TTHM MR 4 SDWIS / VA6033425 / 2950
2009 Total Haloacetic Acids (HAA5) MR 4 SDWIS / VA6033425 / 2456
2005 Interim Enhanced Surface Water Treatment Rule MR 6 SDWIS / VA6033425 / 0300
1996 Lead and Copper Rule TT 4 SDWIS / VA6033425 / 5000
1995 Coliform (TCR) MR 5 SDWIS / VA6033425 / 3100
1985 Arsenic MR 17 SDWIS / VA6033425 / 1005
1985 Cadmium MR 17 SDWIS / VA6033425 / 1015
1985 Chromium MR 17 SDWIS / VA6033425 / 1020
1985 Mercury MR 17 SDWIS / VA6033425 / 1035
1985 Selenium MR 17 SDWIS / VA6033425 / 1045
1985 Barium MR 17 SDWIS / VA6033425 / 1010

How Lake Caroline Compares

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

Metric Lake Caroline Virginia avg Federal benchmark
Total violations 468 52 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 294 9.1 Indicates a contaminant exceeded a federal MCL
PFAS detection None 40.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,933 2,804 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,821 regulated public water systems in Virginia.

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 Lake Caroline water safe to drink? ▼
Lake Caroline (PWS ID: VA6033425) has 468 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,933 people using Surface Water sources.
How many people does Lake Caroline serve? ▼
Lake Caroline serves 2,933 people in Rockville, Virginia. It is a Private-owned system using Surface Water water sources with 1,173 service connections.
What type of violations does Lake Caroline have? ▼
Lake Caroline has 468 total violations: 294 health-based violations (MCL exceedances or treatment failures), 161 monitoring/reporting violations, and 61 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lake Caroline water? ▼
No PFAS testing data is available for Lake Caroline under the EPA's UCMR5 monitoring program.
What water source does Lake Caroline use? ▼
Lake Caroline uses Surface Water 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.