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Community Water System · PWS TX2530004

Siesta Shores Wcid

Zapata, Texas 78076-0321 - drinking water served from surface water sources to 1,842 people, tracked in EPA SDWIS and UCMR5.

1,842
People served
258
EPA violations
69
Health-based
Untested
UCMR5 result

The verdict

EPA records 258 drinking-water violations at Siesta Shores Wcid, 27% of them health-based - above the Texas per-system average.

258
Total EPA violations on record
27%
Health-based (MCL / treatment failure)
1,842
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Siesta Shores Wcid

Siesta Shores Wcid is a local-owned community water system that delivers drinking water to 1,842 residents in Zapata, Texas (Zapata County) through 614 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 258 total violations for this system , of which 69 (27%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 115 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 Public Notice, recorded in 51 violations (Other). 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%).

Siesta Shores Wcid's 258 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
1,842
Total Violations
258
Health-Based Violations
69
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
614
County
Zapata
School/Daycare
No
MCL Violations
44
Monitoring Violations
115
Treatment Tech Violations
25

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Public Notice Other 51 2022
Interim Enhanced Surface Water Treatment Rule MR 37 2018
TTHM MCL 32 2020
Lead and Copper Rule MR 26 2024
Interim Enhanced Surface Water Treatment Rule TT 25 2018
TTHM MR 19 2024
CARBON, TOTAL MR 12 2018
Total Haloacetic Acids (HAA5) MCL 12 2018
Coliform (TCR) MR 8 2015
Total Haloacetic Acids (HAA5) MR 8 2018
Revised Total Coliform Rule MON 4 2023
Surface Water Treatment Rule MR 1 2003

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 Siesta Shores Wcid.

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 TX2530004 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 Siesta Shores Wcid 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 Lead and Copper Rule MR 26 SDWIS / TX2530004 / 5000
2024 TTHM MR 19 SDWIS / TX2530004 / 2950
2023 Revised Total Coliform Rule MON 4 SDWIS / TX2530004 / 8000
2022 Public Notice Other 51 SDWIS / TX2530004 / 7500
2020 TTHM MCL 32 SDWIS / TX2530004 / 2950
2018 Interim Enhanced Surface Water Treatment Rule MR 37 SDWIS / TX2530004 / 0300
2018 Interim Enhanced Surface Water Treatment Rule TT 25 SDWIS / TX2530004 / 0300
2018 CARBON, TOTAL MR 12 SDWIS / TX2530004 / 2920
2018 Total Haloacetic Acids (HAA5) MCL 12 SDWIS / TX2530004 / 2456
2018 Total Haloacetic Acids (HAA5) MR 8 SDWIS / TX2530004 / 2456
2015 Coliform (TCR) MR 8 SDWIS / TX2530004 / 3100
2003 Surface Water Treatment Rule MR 1 SDWIS / TX2530004 / 0200

How Siesta Shores Wcid Compares

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

Metric Siesta Shores Wcid Texas avg Federal benchmark
Total violations 258 101.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 69 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 1,842 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 Siesta Shores Wcid water safe to drink? ▼
Siesta Shores Wcid (PWS ID: TX2530004) has 258 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,842 people using Surface Water sources.
How many people does Siesta Shores Wcid serve? ▼
Siesta Shores Wcid serves 1,842 people in Zapata, Texas. It is a Local-owned system using Surface Water water sources with 614 service connections.
What type of violations does Siesta Shores Wcid have? ▼
Siesta Shores Wcid has 258 total violations: 69 health-based violations (MCL exceedances or treatment failures), 115 monitoring/reporting violations, and 25 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Siesta Shores Wcid water? ▼
No PFAS testing data is available for Siesta Shores Wcid under the EPA's UCMR5 monitoring program.
What water source does Siesta Shores Wcid use? ▼
Siesta Shores Wcid 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.