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Community Water System · PWS TX2420001

Shamrock Municipal Water System

Shamrock, Texas 79079-2229 - drinking water served from groundwater sources to 2,311 people, tracked in EPA SDWIS and UCMR5.

2,311
People served
122
EPA violations
24
Health-based
Untested
UCMR5 result

The verdict

EPA records 122 drinking-water violations at Shamrock Municipal Water System, 20% of them health-based - above the Texas per-system average.

122
Total EPA violations on record
20%
Health-based (MCL / treatment failure)
2,311
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Shamrock Municipal Water System

Shamrock Municipal Water System is a local-owned community water system that delivers drinking water to 2,311 residents in Shamrock, Texas (Wheeler County) through 1,267 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 122 total violations for this system , of which 24 (20%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 76 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 Chlorine, recorded in 50 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 Texas, EPA tracks 7,351 public water systems serving 33,253,313 people, with 746,210 cumulative violations and 162,945 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 101.5 violations. Statewide, 610 of 1,147 UCMR5-tested systems have reported PFAS detections (53.2%).

Shamrock Municipal Water System's 122 violations sit above the Texas 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
2,311
Total Violations
122
Health-Based Violations
24
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,267
County
Wheeler
School/Daycare
No
MCL Violations
24
Monitoring Violations
76
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chlorine MR 50 2014
Public Notice Other 14 2015
Coliform (TCR) MCL 13 2014
Coliform (TCR) MR 13 2012
Nitrate MCL 11 2022
Lead and Copper Rule MR 6 2015
E. COLI MR 4 2011
Revised Total Coliform Rule MON 3 2025

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 Shamrock Municipal Water System.

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 TX2420001 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Texas Drinking Water Authority

Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch is the primacy agency that licenses and inspects Shamrock Municipal Water System under EPA-delegated authority.

Open TX regulator portal

Source: Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch

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 3 SDWIS / TX2420001 / 8000
2022 Nitrate MCL 11 SDWIS / TX2420001 / 1040
2015 Public Notice Other 14 SDWIS / TX2420001 / 7500
2015 Lead and Copper Rule MR 6 SDWIS / TX2420001 / 5000
2014 Chlorine MR 50 SDWIS / TX2420001 / 0999
2014 Coliform (TCR) MCL 13 SDWIS / TX2420001 / 3100
2012 Coliform (TCR) MR 13 SDWIS / TX2420001 / 3100
2011 E. COLI MR 4 SDWIS / TX2420001 / 3014

How Shamrock Municipal Water System Compares

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

Metric Shamrock Municipal Water System Texas avg Federal benchmark
Total violations 122 101.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 24 22.2 Indicates a contaminant exceeded a federal MCL
PFAS detection None 53.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,311 4,524 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,351 regulated public water systems in Texas.

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 Shamrock Municipal Water System water safe to drink? ▼
Shamrock Municipal Water System (PWS ID: TX2420001) has 122 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,311 people using Groundwater sources.
How many people does Shamrock Municipal Water System serve? ▼
Shamrock Municipal Water System serves 2,311 people in Shamrock, Texas. It is a Local-owned system using Groundwater water sources with 1,267 service connections.
What type of violations does Shamrock Municipal Water System have? ▼
Shamrock Municipal Water System has 122 total violations: 24 health-based violations (MCL exceedances or treatment failures), 76 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Shamrock Municipal Water System water? ▼
No PFAS testing data is available for Shamrock Municipal Water System under the EPA's UCMR5 monitoring program.
What water source does Shamrock Municipal Water System use? ▼
Shamrock Municipal Water System 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.