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Community Water System · PWS TX1080034

Llano Grande Lake Park East

Mercedes, Texas 78570-7108 - drinking water served from surface water sources to 1,300 people, tracked in EPA SDWIS and UCMR5.

1,300
People served
208
EPA violations
55
Health-based
Untested
UCMR5 result

The verdict

EPA records 208 drinking-water violations at Llano Grande Lake Park East, 26% of them health-based - above the Texas per-system average.

208
Total EPA violations on record
26%
Health-based (MCL / treatment failure)
1,300
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Llano Grande Lake Park East

Llano Grande Lake Park East is a private-owned community water system that delivers drinking water to 1,300 residents in Mercedes, Texas (Hidalgo County) through 701 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 208 total violations for this system , of which 55 (26%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 98 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 Lead and Copper Rule, recorded in 74 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, 1,068 of 1,147 UCMR5-tested systems have reported PFAS detections (93.1%).

Llano Grande Lake Park East's 208 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
1,300
Total Violations
208
Health-Based Violations
55
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
701
County
Hidalgo
School/Daycare
No
MCL Violations
26
Monitoring Violations
98
Treatment Tech Violations
29

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 74 2025
Public Notice Other 36 2023
Lead and Copper Rule TT 29 2022
TTHM MCL 26 2015
Consumer Confidence Rule Other 13 2023
Nitrite MR 12 2023
Total Haloacetic Acids (HAA5) MR 4 2014
Chlorine MR 4 2017
TTHM MR 4 2014

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 Llano Grande Lake Park East.

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 TX1080034 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 Llano Grande Lake Park East 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 Lead and Copper Rule MR 74 SDWIS / TX1080034 / 5000
2023 Public Notice Other 36 SDWIS / TX1080034 / 7500
2023 Consumer Confidence Rule Other 13 SDWIS / TX1080034 / 7000
2023 Nitrite MR 12 SDWIS / TX1080034 / 1041
2022 Lead and Copper Rule TT 29 SDWIS / TX1080034 / 5000
2017 Chlorine MR 4 SDWIS / TX1080034 / 0999
2015 TTHM MCL 26 SDWIS / TX1080034 / 2950
2014 Total Haloacetic Acids (HAA5) MR 4 SDWIS / TX1080034 / 2456
2014 TTHM MR 4 SDWIS / TX1080034 / 2950

How Llano Grande Lake Park East Compares

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

Metric Llano Grande Lake Park East Texas avg Federal benchmark
Total violations 208 101.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 55 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 1,300 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 Llano Grande Lake Park East water safe to drink? ▼
Llano Grande Lake Park East (PWS ID: TX1080034) has 208 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,300 people using Surface Water sources.
How many people does Llano Grande Lake Park East serve? ▼
Llano Grande Lake Park East serves 1,300 people in Mercedes, Texas. It is a Private-owned system using Surface Water water sources with 701 service connections.
What type of violations does Llano Grande Lake Park East have? ▼
Llano Grande Lake Park East has 208 total violations: 55 health-based violations (MCL exceedances or treatment failures), 98 monitoring/reporting violations, and 29 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Llano Grande Lake Park East water? ▼
No PFAS testing data is available for Llano Grande Lake Park East under the EPA's UCMR5 monitoring program.
What water source does Llano Grande Lake Park East use? ▼
Llano Grande Lake Park East 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. 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.