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LONDONDERRY ELEM SCH

PWS ID: PA7220373 · HUMMELSTOWN, Pennsylvania 17036

LONDONDERRY ELEM SCH serves 465 people in HUMMELSTOWN, Pennsylvania using Groundwater water sources. It has 373 recorded EPA violations, including 15 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: LONDONDERRY ELEM SCH

LONDONDERRY ELEM SCH is a local-owned non-transient non-community water system that delivers drinking water to 465 residents in HUMMELSTOWN, Pennsylvania (Dauphin County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 373 total violations for this system , of which 15 (4%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 347 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Nitrite, recorded in 33 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Pennsylvania, EPA tracks 7,701 public water systems serving 12,630,061 people, with 1,159,868 cumulative violations and 68,517 health-based violations on record. About 97% of systems in the state carry at least one violation, and state-wide the average per system is 150.6 violations. LONDONDERRY ELEM SCH's 373 violations sit above the Pennsylvania average. Statewide, 224 of 389 UCMR5-tested systems have reported PFAS detections (57.6%). 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
465
Total Violations
373
Health-Based Violations
15
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
1
County
Dauphin
School/Daycare
Yes
MCL Violations
15
Monitoring Violations
347
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrite MR 33 2024
Nitrate MR 26 2024
Xylenes, Total MR 15 2001
DICHLOROMETHANE MR 15 2001
o-Dichlorobenzene MR 15 2001
p-Dichlorobenzene MR 15 2001
cis-1,2-Dichloroethylene MR 15 2001
1,2-Dichloroethane MR 13 2001
1,1,1-Trichloroethane MR 13 2001
Carbon tetrachloride MR 13 2001
1,2-Dichloropropane MR 13 2001
1,1,2-Trichloroethane MR 13 2001
Tetrachloroethylene MR 13 2001
CHLOROBENZENE MR 13 2001
Ethylbenzene MR 13 2001
Styrene MR 13 2001
1,2,4-Trichlorobenzene MR 13 2001
1,1-Dichloroethylene MR 13 2001
Benzene MR 13 2001
Toluene MR 13 2001
trans-1,2-Dichloroethylene MR 13 2001
Trichloroethylene MR 13 2001
Lead and Copper Rule MR 10 2016
Benzene MCL 8 2003
Nitrate MCL 7 2006
Revised Total Coliform Rule MON 6 2025
Public Notice Other 4 2006
Coliform (TCR) MR 2 1997

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 LONDONDERRY ELEM SCH.

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 PA7220373 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Pennsylvania Drinking Water Authority

Pennsylvania DEP — Bureau of Safe Drinking Water is the primacy agency that licenses and inspects LONDONDERRY ELEM SCH under EPA-delegated authority.

Open PA regulator portal

Source: Pennsylvania DEP — Bureau of Safe 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
2025 Revised Total Coliform Rule MON 6 SDWIS / PA7220373 / 8000
2024 Nitrite MR 33 SDWIS / PA7220373 / 1041
2024 Nitrate MR 26 SDWIS / PA7220373 / 1040
2016 Lead and Copper Rule MR 10 SDWIS / PA7220373 / 5000
2006 Nitrate MCL 7 SDWIS / PA7220373 / 1040
2006 Public Notice Other 4 SDWIS / PA7220373 / 7500
2003 Benzene MCL 8 SDWIS / PA7220373 / 2990
2001 Xylenes, Total MR 15 SDWIS / PA7220373 / 2955
2001 DICHLOROMETHANE MR 15 SDWIS / PA7220373 / 2964
2001 o-Dichlorobenzene MR 15 SDWIS / PA7220373 / 2968
2001 p-Dichlorobenzene MR 15 SDWIS / PA7220373 / 2969
2001 cis-1,2-Dichloroethylene MR 15 SDWIS / PA7220373 / 2380
2001 1,2-Dichloroethane MR 13 SDWIS / PA7220373 / 2980
2001 1,1,1-Trichloroethane MR 13 SDWIS / PA7220373 / 2981
2001 Carbon tetrachloride MR 13 SDWIS / PA7220373 / 2982

How LONDONDERRY ELEM SCH Compares

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

Metric LONDONDERRY ELEM SCH Pennsylvania avg Federal benchmark
Total violations 373 150.6 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 15 8.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 57.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 465 1,640 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,701 regulated public water systems in Pennsylvania.

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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is LONDONDERRY ELEM SCH water safe to drink? ▼
LONDONDERRY ELEM SCH (PWS ID: PA7220373) has 373 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 465 people using Groundwater sources.
How many people does LONDONDERRY ELEM SCH serve? ▼
LONDONDERRY ELEM SCH serves 465 people in HUMMELSTOWN, Pennsylvania. It is a Local-owned system using Groundwater water sources with 1 service connections.
What type of violations does LONDONDERRY ELEM SCH have? ▼
LONDONDERRY ELEM SCH has 373 total violations: 15 health-based violations (MCL exceedances or treatment failures), 347 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in LONDONDERRY ELEM SCH water? ▼
No PFAS testing data is available for LONDONDERRY ELEM SCH under the EPA's UCMR5 monitoring program.
What water source does LONDONDERRY ELEM SCH use? ▼
LONDONDERRY ELEM SCH uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.

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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.

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