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Community Water System · PWS PA7220001

Oak Knoll Est MHP

Lemoyne, Pennsylvania 17043 - drinking water served from groundwater sources to 350 people, tracked in EPA SDWIS and UCMR5.

350
People served
491
EPA violations
21
Health-based
Untested
UCMR5 result

The verdict

EPA records 491 drinking-water violations at Oak Knoll Est MHP, 4% of them health-based - above the Pennsylvania per-system average.

491
Total EPA violations on record
4%
Health-based (MCL / treatment failure)
350
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Oak Knoll Est MHP

Oak Knoll Est MHP is a private-owned community water system that delivers drinking water to 350 residents in Lemoyne, Pennsylvania (Dauphin County) through 102 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 491 total violations for this system , of which 21 (4%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 438 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 Nitrate, recorded in 46 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. Statewide, 224 of 389 UCMR5-tested systems have reported PFAS detections (57.6%).

Oak Knoll Est MHP's 491 violations sit above the Pennsylvania 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
350
Total Violations
491
Health-Based Violations
21
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
102
County
Dauphin
School/Daycare
No
MCL Violations
1
Monitoring Violations
438
Treatment Tech Violations
20

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 46 2023
Groundwater Rule MR 39 2024
Chlorine MR 23 2017
Groundwater Rule TT 20 2019
Public Notice Other 20 2019
Coliform (TCR) MR 17 2012
1,1-Dichloroethylene MR 14 2003
1,2-Dichloroethane MR 14 2003
Carbon tetrachloride MR 14 2003
Trichloroethylene MR 14 2003
p-Dichlorobenzene MR 14 2003
1,1,1-Trichloroethane MR 14 2003
Benzene MR 14 2003
1,2,4-Trichlorobenzene MR 12 2003
DICHLOROMETHANE MR 12 2003
1,1,2-Trichloroethane MR 12 2003
CHLOROBENZENE MR 12 2003
Toluene MR 12 2003
Xylenes, Total MR 12 2003
1,2-Dichloropropane MR 12 2003
o-Dichlorobenzene MR 12 2003
Tetrachloroethylene MR 12 2003
Styrene MR 12 2003
trans-1,2-Dichloroethylene MR 12 2003
Ethylbenzene MR 12 2003
cis-1,2-Dichloroethylene MR 12 2003
Atrazine MR 8 2003
Nitrite MR 8 2023
Lead and Copper Rule MR 4 1994
Diquat MR 4 2015

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 Oak Knoll Est MHP.

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 PA7220001 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 Oak Knoll Est MHP 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
2024 Groundwater Rule MR 39 SDWIS / PA7220001 / 0700
2023 Nitrate MR 46 SDWIS / PA7220001 / 1040
2023 Nitrite MR 8 SDWIS / PA7220001 / 1041
2022 Gross Alpha, Excl. Radon and U MR 3 SDWIS / PA7220001 / 4000
2022 Combined Uranium MR 2 SDWIS / PA7220001 / 4006
2019 Groundwater Rule TT 20 SDWIS / PA7220001 / 0700
2019 Public Notice Other 20 SDWIS / PA7220001 / 7500
2018 Endothall MR 2 SDWIS / PA7220001 / 2033
2017 Chlorine MR 23 SDWIS / PA7220001 / 0999
2015 Diquat MR 4 SDWIS / PA7220001 / 2032
2012 Coliform (TCR) MR 17 SDWIS / PA7220001 / 3100
2007 Consumer Confidence Rule Other 4 SDWIS / PA7220001 / 7000
2003 1,1-Dichloroethylene MR 14 SDWIS / PA7220001 / 2977
2003 1,2-Dichloroethane MR 14 SDWIS / PA7220001 / 2980
2003 Carbon tetrachloride MR 14 SDWIS / PA7220001 / 2982

How Oak Knoll Est MHP Compares

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

Metric Oak Knoll Est MHP Pennsylvania avg Federal benchmark
Total violations 491 150.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 21 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 350 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 (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 Oak Knoll Est MHP water safe to drink? ▼
Oak Knoll Est MHP (PWS ID: PA7220001) has 491 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 350 people using Groundwater sources.
How many people does Oak Knoll Est MHP serve? ▼
Oak Knoll Est MHP serves 350 people in Lemoyne, Pennsylvania. It is a Private-owned system using Groundwater water sources with 102 service connections.
What type of violations does Oak Knoll Est MHP have? ▼
Oak Knoll Est MHP has 491 total violations: 21 health-based violations (MCL exceedances or treatment failures), 438 monitoring/reporting violations, and 20 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Oak Knoll Est MHP water? ▼
No PFAS testing data is available for Oak Knoll Est MHP under the EPA's UCMR5 monitoring program.
What water source does Oak Knoll Est MHP use? ▼
Oak Knoll Est MHP 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.