PlainWater
States → Virginia

Community Water System · PWS VA1121755

Twin Boulders Subdivision

Christiansburg, Virginia 24073 - drinking water served from groundwater sources to 90 people, tracked in EPA SDWIS and UCMR5.

90
People served
357
EPA violations
12
Health-based
Untested
UCMR5 result

The verdict

EPA records 357 drinking-water violations at Twin Boulders Subdivision, 3% of them health-based - above the Virginia per-system average.

357
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
90
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Twin Boulders Subdivision

Twin Boulders Subdivision is a private-owned community water system that delivers drinking water to 90 residents in Christiansburg, Virginia (Montgomery County) through 29 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 357 total violations for this system , of which 12 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 235 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Public Notice, recorded in 65 violations (Other). 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%).

Twin Boulders Subdivision's 357 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
90
Total Violations
357
Health-Based Violations
12
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
29
County
Montgomery
School/Daycare
No
MCL Violations
0
Monitoring Violations
235
Treatment Tech Violations
12

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Public Notice Other 65 2022
Revised Total Coliform Rule MON 62 2021
Coliform (TCR) MR 27 2003
Chlorine MR 21 2021
Consumer Confidence Rule Other 14 2024
Lead and Copper Rule MR 10 2016
Total Haloacetic Acids (HAA5) MR 9 2019
TTHM MR 9 2019
Nitrate-Nitrite MR 9 2021
Lead and Copper Rule TT 7 1999
Lead and Copper Rule Other 7 1999
Stage 1 Disinfectants and Disinfection Byproducts Rule TT 5 2020
Nitrate MR 4 2002
cis-1,2-Dichloroethylene MR 4 2002
Xylenes, Total MR 4 2002
o-Dichlorobenzene MR 4 2002
p-Dichlorobenzene MR 4 2002
1,1-Dichloroethylene MR 4 2002
trans-1,2-Dichloroethylene MR 4 2002
1,2-Dichloroethane MR 4 2002
Carbon tetrachloride MR 4 2002
1,1,2-Trichloroethane MR 4 2002
CHLOROBENZENE MR 4 2002
Benzene MR 4 2002
Toluene MR 4 2002
Styrene MR 4 2002
DICHLOROMETHANE MR 4 2002
1,1,1-Trichloroethane MR 4 2002
Ethylbenzene MR 4 2002
Vinyl chloride MR 4 2002

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 Twin Boulders Subdivision.

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 VA1121755 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 Twin Boulders Subdivision 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
2024 Consumer Confidence Rule Other 14 SDWIS / VA1121755 / 7000
2022 Public Notice Other 65 SDWIS / VA1121755 / 7500
2021 Revised Total Coliform Rule MON 62 SDWIS / VA1121755 / 8000
2021 Chlorine MR 21 SDWIS / VA1121755 / 0999
2021 Nitrate-Nitrite MR 9 SDWIS / VA1121755 / 1038
2020 Stage 1 Disinfectants and Disinfection Byproducts Rule TT 5 SDWIS / VA1121755 / 0400
2019 Total Haloacetic Acids (HAA5) MR 9 SDWIS / VA1121755 / 2456
2019 TTHM MR 9 SDWIS / VA1121755 / 2950
2016 Lead and Copper Rule MR 10 SDWIS / VA1121755 / 5000
2003 Coliform (TCR) MR 27 SDWIS / VA1121755 / 3100
2002 Nitrate MR 4 SDWIS / VA1121755 / 1040
2002 cis-1,2-Dichloroethylene MR 4 SDWIS / VA1121755 / 2380
2002 Xylenes, Total MR 4 SDWIS / VA1121755 / 2955
2002 o-Dichlorobenzene MR 4 SDWIS / VA1121755 / 2968
2002 p-Dichlorobenzene MR 4 SDWIS / VA1121755 / 2969

How Twin Boulders Subdivision Compares

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

Metric Twin Boulders Subdivision Virginia avg Federal benchmark
Total violations 357 52 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 12 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 90 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 Twin Boulders Subdivision water safe to drink? ▼
Twin Boulders Subdivision (PWS ID: VA1121755) has 357 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 90 people using Groundwater sources.
How many people does Twin Boulders Subdivision serve? ▼
Twin Boulders Subdivision serves 90 people in Christiansburg, Virginia. It is a Private-owned system using Groundwater water sources with 29 service connections.
What type of violations does Twin Boulders Subdivision have? ▼
Twin Boulders Subdivision has 357 total violations: 12 health-based violations (MCL exceedances or treatment failures), 235 monitoring/reporting violations, and 12 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Twin Boulders Subdivision water? ▼
No PFAS testing data is available for Twin Boulders Subdivision under the EPA's UCMR5 monitoring program.
What water source does Twin Boulders Subdivision use? ▼
Twin Boulders Subdivision uses Groundwater 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.