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Londonderry, PA Tap Water Quality 2026

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

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

Main Utility: Cedar Manor Mhp PWSID: PA7220002 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 5.20 ppb, 35% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Londonderry earns a B for water quality

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

Lead: 5.20 ppb — 35% of the federal action level
PFAS never sampled at this system
30 violations since 2015, 17 health-based
No violations currently open
Londonderry's lead level vs. all Pennsylvania community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 5.20 ppb — 35% of the federal action level
✓ Lower lead than 27% of Pennsylvania utilities
Population Served
519
~315 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
30 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
35% of EPA action level
5.20 ppb
Action level: 15 ppb
The 90th-percentile lead result is 5.20 ppb, 35% 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
Groundwater Rule TREATMENT TECHNIQUE — — 2021 Resolved
Di(2-ethylhexyl) adipate MONITORING AND REPORTING — 0.4 mg/L 2020 Resolved
Groundwater Rule MONITORING AND REPORTING — — 2019 Resolved
Nitrate MCL EXCEEDANCE 24 MG/L 10 mg/L 2019 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.3025 PCI/L 15 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 28.8025 PCI/L 15 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 29.825 PCI/L 15 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 29.375 PCI/L 15 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.675 PCI/L 5 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 29.525 PCI/L 15 pCi/L 2017 Resolved
Public Notice OTHER — — 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22.025 PCI/L 15 pCi/L 2017 Resolved
Public Notice OTHER — — 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.0125 PCI/L 15 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 17.7025 PCI/L 15 pCi/L 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.8775 PCI/L 15 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.0875 PCI/L 15 pCi/L 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.16 PCI/L 15 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.2875 PCI/L 15 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 4.5 PCI/L 15 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 23.3 PCI/L 15 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/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

30 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 Cedar Manor Mhp
PWSID PA7220002
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 519
Service connections 315
Systems serving this area 7
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Londonderry tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 5.20 ppb, 35% of the action level.
Does Londonderry 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 Londonderry? ▼
Cedar Manor Mhp (PWSID PA7220002), one of 7 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-01-29. No significant deficiencies were recorded.

What Should Londonderry Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
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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