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Community Water System · PWS NC0392298

Stonehenge S/D

Cary, North Carolina 27511 - drinking water served from groundwater sources to 1,840 people, tracked in EPA SDWIS and UCMR5.

1,840
People served
294
EPA violations
231
Health-based
Untested
UCMR5 result

The verdict

EPA records 294 drinking-water violations at Stonehenge S/D, 79% of them health-based - above the North Carolina per-system average.

294
Total EPA violations on record
79%
Health-based (MCL / treatment failure)
1,840
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Stonehenge S/D

Stonehenge S/D is a private-owned community water system that delivers drinking water to 1,840 residents in Cary, North Carolina (Wake County) through 737 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 294 total violations for this system , of which 231 (79%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 28 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 Combined Radium (-226 and -228), recorded in 198 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 North Carolina, EPA tracks 5,020 public water systems serving 9,877,724 people, with 524,053 cumulative violations and 38,492 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 104.4 violations. Statewide, 174 of 287 UCMR5-tested systems have reported PFAS detections (60.6%).

Stonehenge S/D's 294 violations sit above the North Carolina 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
1,840
Total Violations
294
Health-Based Violations
231
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
737
County
Wake
School/Daycare
No
MCL Violations
231
Monitoring Violations
28
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MCL 198 2008
Gross Alpha, Excl. Radon and U MCL 33 2007
Public Notice Other 20 2008
Nitrate MR 7 2023
Consumer Confidence Rule Other 6 2024
Gross Alpha, Excl. Radon and U MR 4 2008
Combined Radium (-226 and -228) MR 3 2008
Selenium MR 2 1985
Chromium MR 2 1985
Fluoride MR 2 1985
Mercury MR 2 1985
Arsenic MR 2 1985
Cadmium MR 2 1985
Barium MR 2 1985

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 Stonehenge S/D.

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 NC0392298 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

North Carolina Drinking Water Authority

North Carolina DEQ, Public Water Supply Section is the primacy agency that licenses and inspects Stonehenge S/D under EPA-delegated authority.

Open NC regulator portal

Source: North Carolina DEQ, Public Water Supply Section

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 6 SDWIS / NC0392298 / 7000
2023 Nitrate MR 7 SDWIS / NC0392298 / 1040
2008 Combined Radium (-226 and -228) MCL 198 SDWIS / NC0392298 / 4010
2008 Public Notice Other 20 SDWIS / NC0392298 / 7500
2008 Gross Alpha, Excl. Radon and U MR 4 SDWIS / NC0392298 / 4000
2008 Combined Radium (-226 and -228) MR 3 SDWIS / NC0392298 / 4010
2007 Gross Alpha, Excl. Radon and U MCL 33 SDWIS / NC0392298 / 4000
1985 Selenium MR 2 SDWIS / NC0392298 / 1045
1985 Chromium MR 2 SDWIS / NC0392298 / 1020
1985 Fluoride MR 2 SDWIS / NC0392298 / 1025
1985 Mercury MR 2 SDWIS / NC0392298 / 1035
1985 Arsenic MR 2 SDWIS / NC0392298 / 1005
1985 Cadmium MR 2 SDWIS / NC0392298 / 1015
1985 Barium MR 2 SDWIS / NC0392298 / 1010

How Stonehenge S/D Compares

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

Metric Stonehenge S/D North Carolina avg Federal benchmark
Total violations 294 104.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 231 7.7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 60.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,840 1,968 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 5,020 regulated public water systems in North Carolina.

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 Stonehenge S/D water safe to drink? ▼
Stonehenge S/D (PWS ID: NC0392298) has 294 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,840 people using Groundwater sources.
How many people does Stonehenge S/D serve? ▼
Stonehenge S/D serves 1,840 people in Cary, North Carolina. It is a Private-owned system using Groundwater water sources with 737 service connections.
What type of violations does Stonehenge S/D have? ▼
Stonehenge S/D has 294 total violations: 231 health-based violations (MCL exceedances or treatment failures), 28 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Stonehenge S/D water? ▼
No PFAS testing data is available for Stonehenge S/D under the EPA's UCMR5 monitoring program.
What water source does Stonehenge S/D use? ▼
Stonehenge S/D 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.