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Community Water System · PWS PA4340005

Groninger Farms Arch Rock

Mexico, Pennsylvania 17056 - drinking water served from groundwater sources to 175 people, tracked in EPA SDWIS and UCMR5.

175
People served
121
EPA violations
5
Health-based
Untested
UCMR5 result

The verdict

EPA records 121 drinking-water violations at Groninger Farms Arch Rock, 4% of them health-based - below the Pennsylvania per-system average.

121
Total EPA violations on record
4%
Health-based (MCL / treatment failure)
175
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Groninger Farms Arch Rock

Groninger Farms Arch Rock is a private-owned community water system that delivers drinking water to 175 residents in Mexico, Pennsylvania (Juniata County) through 63 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 121 total violations for this system , of which 5 (4%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 111 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Di(2-ethylhexyl) phthalate, recorded in 7 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, 173 of 389 UCMR5-tested systems have reported PFAS detections (44.5%).

Groninger Farms Arch Rock's 121 violations sit below 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
175
Total Violations
121
Health-Based Violations
5
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
63
County
Juniata
School/Daycare
No
MCL Violations
0
Monitoring Violations
111
Treatment Tech Violations
5

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Di(2-ethylhexyl) phthalate MR 7 2018
Chlorine MR 6 2018
Lead and Copper Rule MR 6 2012
Groundwater Rule TT 5 2012
Xylenes, Total MR 4 2022
1,1-Dichloroethylene MR 4 2022
Public Notice Other 3 2012
BHC-GAMMA MR 3 2013
Di(2-ethylhexyl) adipate MR 3 2013
Dinoseb MR 3 2013
Atrazine MR 3 2013
LASSO MR 3 2013
Benzo(a)pyrene MR 3 2013
1,2-DIBROMO-3-CHLOROPROPANE MR 3 2013
Chlordane MR 3 2013
OXAMYL MR 3 2013
ETHYLENE DIBROMIDE MR 3 2013
Endothall MR 3 2013
Carbofuran MR 3 2013
HEXACHLOROBENZENE MR 3 2013
Heptachlor epoxide MR 3 2013
Endrin MR 3 2013
Glyphosate MR 3 2013
Heptachlor MR 3 2013
2,4-D MR 3 2013
Diquat MR 3 2013
Hexachlorocyclopentadiene MR 3 2013
Dalapon MR 3 2013
2,4,5-TP MR 3 2013
Pentachlorophenol MR 3 2013

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 Groninger Farms Arch Rock.

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 PA4340005 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 Groninger Farms Arch Rock 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
2022 Xylenes, Total MR 4 SDWIS / PA4340005 / 2955
2022 1,1-Dichloroethylene MR 4 SDWIS / PA4340005 / 2977
2021 Groundwater Rule MR 1 SDWIS / PA4340005 / 0700
2018 Di(2-ethylhexyl) phthalate MR 7 SDWIS / PA4340005 / 2039
2018 Chlorine MR 6 SDWIS / PA4340005 / 0999
2013 BHC-GAMMA MR 3 SDWIS / PA4340005 / 2010
2013 Di(2-ethylhexyl) adipate MR 3 SDWIS / PA4340005 / 2035
2013 Dinoseb MR 3 SDWIS / PA4340005 / 2041
2013 Atrazine MR 3 SDWIS / PA4340005 / 2050
2013 LASSO MR 3 SDWIS / PA4340005 / 2051
2013 Benzo(a)pyrene MR 3 SDWIS / PA4340005 / 2306
2013 1,2-DIBROMO-3-CHLOROPROPANE MR 3 SDWIS / PA4340005 / 2931
2013 Chlordane MR 3 SDWIS / PA4340005 / 2959
2013 OXAMYL MR 3 SDWIS / PA4340005 / 2036
2013 ETHYLENE DIBROMIDE MR 3 SDWIS / PA4340005 / 2946

How Groninger Farms Arch Rock Compares

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

Metric Groninger Farms Arch Rock Pennsylvania avg Federal benchmark
Total violations 121 150.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 5 8.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 44.5% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 175 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 Groninger Farms Arch Rock water safe to drink? ▼
Groninger Farms Arch Rock (PWS ID: PA4340005) has 121 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 175 people using Groundwater sources.
How many people does Groninger Farms Arch Rock serve? ▼
Groninger Farms Arch Rock serves 175 people in Mexico, Pennsylvania. It is a Private-owned system using Groundwater water sources with 63 service connections.
What type of violations does Groninger Farms Arch Rock have? ▼
Groninger Farms Arch Rock has 121 total violations: 5 health-based violations (MCL exceedances or treatment failures), 111 monitoring/reporting violations, and 5 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Groninger Farms Arch Rock water? ▼
No PFAS testing data is available for Groninger Farms Arch Rock under the EPA's UCMR5 monitoring program.
What water source does Groninger Farms Arch Rock use? ▼
Groninger Farms Arch Rock 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.