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Community Water System · PWS TX0220013

Marathon Water Supply & Sewer Service

Marathon, Texas 79842-0233 - drinking water served from groundwater sources to 430 people, tracked in EPA SDWIS and UCMR5.

430
People served
29
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 29 drinking-water violations at Marathon Water Supply & Sewer Service, 7% of them health-based - below the Texas per-system average.

29
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
430
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Marathon Water Supply & Sewer Service

Marathon Water Supply & Sewer Service is a local-owned community water system that delivers drinking water to 430 residents in Marathon, Texas (Brewster County) through 477 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 29 total violations for this system , of which 2 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 13 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 Coliform (TCR), recorded in 9 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%).

Marathon Water Supply & Sewer Service's 29 violations sit below 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
430
Total Violations
29
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
477
County
Brewster
School/Daycare
No
MCL Violations
2
Monitoring Violations
13
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 9 1992
Coliform (TCR) Other 9 1992
Lead and Copper Rule MR 4 2017
Coliform (TCR) MCL 2 1992
Consumer Confidence Rule Other 2 2024

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 Marathon Water Supply & Sewer Service.

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 TX0220013 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 Marathon Water Supply & Sewer Service 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
2024 Consumer Confidence Rule Other 2 SDWIS / TX0220013 / 7000
2017 Lead and Copper Rule MR 4 SDWIS / TX0220013 / 5000
1992 Coliform (TCR) MR 9 SDWIS / TX0220013 / 3100
1992 Coliform (TCR) Other 9 SDWIS / TX0220013 / 3100
1992 Coliform (TCR) MCL 2 SDWIS / TX0220013 / 3100

How Marathon Water Supply & Sewer Service Compares

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

Metric Marathon Water Supply & Sewer Service Texas avg Federal benchmark
Total violations 29 101.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 2 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 430 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 Marathon Water Supply & Sewer Service water safe to drink? ▼
Marathon Water Supply & Sewer Service (PWS ID: TX0220013) has 29 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 430 people using Groundwater sources.
How many people does Marathon Water Supply & Sewer Service serve? ▼
Marathon Water Supply & Sewer Service serves 430 people in Marathon, Texas. It is a Local-owned system using Groundwater water sources with 477 service connections.
What type of violations does Marathon Water Supply & Sewer Service have? ▼
Marathon Water Supply & Sewer Service has 29 total violations: 2 health-based violations (MCL exceedances or treatment failures), 13 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Marathon Water Supply & Sewer Service water? ▼
No PFAS testing data is available for Marathon Water Supply & Sewer Service under the EPA's UCMR5 monitoring program.
What water source does Marathon Water Supply & Sewer Service use? ▼
Marathon Water Supply & Sewer Service 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.