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Knightdale, NC Tap Water Quality 2026

Water quality report for Knightdale, NC — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Knightdale's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Rockbridge S/d PWSID: NC4092073 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 3.00 ppb, 20% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Knightdale earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 3.00 ppb — 20% of the federal action level
PFAS never sampled at this system
47 violations since 2015, 17 health-based
No violations currently open
Knightdale's lead level vs. all North Carolina community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 3.00 ppb — 20% of the federal action level
✓ Lower lead than 81% of North Carolina utilities
Population Served
6294
~410 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
47 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
20% of EPA action level
3.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 3.00 ppb, 20% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Public Notice OTHER — — 2026 Addressed
Public Notice OTHER — — 2026 Addressed
Revised Total Coliform Rule MONITORING FAILURE — — 2026 Archived
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2026 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 359 PCI/L 15 pCi/L 2026 Archived
Combined Uranium MCL EXCEEDANCE 55.6 PCI/L 30 ug/L 2026 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2026 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Archived
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Archived
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 356 PCI/L 15 pCi/L 2025 Archived
Combined Uranium MCL EXCEEDANCE 55 PCI/L 30 ug/L 2025 Archived
Consumer Confidence Rule OTHER — — 2025 Addressed
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Archived
Nitrate MONITORING AND REPORTING — 10 mg/L 2025 Archived
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Resolved
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Resolved
Consumer Confidence Rule OTHER — — 2024 Addressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2024 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021–2022 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021–2022 Resolved
Combined Uranium MCL EXCEEDANCE 42.1 PCI/L 30 ug/L 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Combined Uranium MCL EXCEEDANCE 46.1 PCI/L 30 ug/L 2016 Resolved
Combined Uranium MCL EXCEEDANCE 77.1 PCI/L 30 ug/L 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Combined Uranium MCL EXCEEDANCE 60.4 PCI/L 30 ug/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 41.3 PCI/L 15 pCi/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 81.1 PCI/L 30 ug/L 2015 Resolved
Public Notice OTHER — — 2015 Resolved
Public Notice OTHER — — 2015 Addressed
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 28 PCI/L 15 pCi/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 83 PCI/L 30 ug/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 29 PCI/L 15 pCi/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 55 PCI/L 30 ug/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 29 PCI/L 15 pCi/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 71 PCI/L 30 ug/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

47 violations are on record since 2015, of which 17 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Rockbridge S/D
PWSID NC4092073
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 6,294
Service connections 410
Systems serving this area 10
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Knightdale tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 3.00 ppb, 20% of the action level.
Does Knightdale water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Knightdale? ▼
Rockbridge S/D (PWSID NC4092073), one of 10 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-05-23. No significant deficiencies were recorded.

What Should Knightdale Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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