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Community Water System · PWS TX0310004

City of los Fresnos

Los Fresnos, Texas 78566-3246 - drinking water served from surface water sources to 6,009 people, tracked in EPA SDWIS and UCMR5.

6,009
People served
298
EPA violations
74
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 298 drinking-water violations at City of los Fresnos, 25% of them health-based - above the Texas per-system average.

298
Total EPA violations on record
25%
Health-based (MCL / treatment failure)
6,009
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: City of los Fresnos

City of los Fresnos is a local-owned community water system that delivers drinking water to 6,009 residents in Los Fresnos, Texas (Cameron County) through 2,003 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 298 total violations for this system , of which 74 (25%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 146 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is Interim Enhanced Surface Water Treatment Rule, recorded in 136 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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, 1,068 of 1,147 UCMR5-tested systems have reported PFAS detections (93.1%).

City of los Fresnos's 298 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
6,009
Total Violations
298
Health-Based Violations
74
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
2,003
County
Cameron
School/Daycare
No
MCL Violations
36
Monitoring Violations
146
Treatment Tech Violations
38

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Interim Enhanced Surface Water Treatment Rule MR 136 2016
Public Notice Other 73 2016
Interim Enhanced Surface Water Treatment Rule TT 38 2016
TTHM MCL 23 2005
Total Haloacetic Acids (HAA5) MCL 13 2004
Lead and Copper Rule MR 6 2016
Coliform (TCR) MR 4 2003
Consumer Confidence Rule Other 2 2014

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
NFDHA 7/10/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 7/10/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 7/10/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 7/10/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 7/10/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 7/10/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 7/10/2023 <6.00 ppt 6.00 ppt Not Detected
PFDoA 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 7/10/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 7/10/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 7/10/2023 <5.00 ppt 5.00 ppt Not Detected
PFDA 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 7/10/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 7/10/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 7/10/2023 <2.00 ppt 2.00 ppt Not Detected
HFPO-DA 7/10/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 7/10/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 7/10/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 7/10/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 7/10/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpA 5/30/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 5/30/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 5/30/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 5/30/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 5/30/2023 <6.00 ppt 6.00 ppt Not Detected
PFHpS 5/30/2023 <3.00 ppt 3.00 ppt Not Detected
PFBA 5/30/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 5/30/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 5/30/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 5/30/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 5/30/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 5/30/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 5/30/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 5/30/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 5/30/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 5/30/2023 <20.00 ppt 20.00 ppt Not Detected
6:2 FTS 5/30/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 5/30/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 5/30/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 5/30/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 5/30/2023 <4.00 ppt 4.00 ppt Not Detected

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 City of los Fresnos.

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 TX0310004 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 City of los Fresnos 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
2016 Interim Enhanced Surface Water Treatment Rule MR 136 SDWIS / TX0310004 / 0300
2016 Public Notice Other 73 SDWIS / TX0310004 / 7500
2016 Interim Enhanced Surface Water Treatment Rule TT 38 SDWIS / TX0310004 / 0300
2016 Lead and Copper Rule MR 6 SDWIS / TX0310004 / 5000
2014 Consumer Confidence Rule Other 2 SDWIS / TX0310004 / 7000
2005 TTHM MCL 23 SDWIS / TX0310004 / 2950
2004 Total Haloacetic Acids (HAA5) MCL 13 SDWIS / TX0310004 / 2456
2003 Coliform (TCR) MR 4 SDWIS / TX0310004 / 3100

How City of los Fresnos Compares

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

Metric City of los Fresnos Texas avg Federal benchmark
Total violations 298 101.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 74 22.2 Indicates a contaminant exceeded a federal MCL
PFAS detection None 93.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 6,009 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 City of los Fresnos water safe to drink? ▼
City of los Fresnos (PWS ID: TX0310004) has 298 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 6,009 people using Surface Water sources.
How many people does City of los Fresnos serve? ▼
City of los Fresnos serves 6,009 people in Los Fresnos, Texas. It is a Local-owned system using Surface Water water sources with 2,003 service connections.
What type of violations does City of los Fresnos have? ▼
City of los Fresnos has 298 total violations: 74 health-based violations (MCL exceedances or treatment failures), 146 monitoring/reporting violations, and 38 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in City of los Fresnos water? ▼
No. City of los Fresnos was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does City of los Fresnos use? ▼
City of los Fresnos uses Surface Water 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). 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.