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Rio Grande City, TX Tap Water Quality 2026

Water quality report for Rio Grande City, TX — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Rio Grande City's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: City Of Rio Grande City PWSID: TX2140018 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. No PFAS was detected.

B

Rio Grande City earns a B for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: not detected
PFAS tested, none detected
32 violations since 2015, 3 health-based
No violations currently open
Rio Grande City's lead level vs. all Texas community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Texas utilities
Population Served
12307
~7337 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
32 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Consumer Confidence Rule OTHER — — 2025 Unaddressed
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Resolved
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Resolved
Consumer Confidence Rule OTHER — — 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2020 Resolved
Consumer Confidence Rule OTHER — — 2020 Resolved
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2020–2022 Archived
Aldicarb sulfoxide MONITORING AND REPORTING — — 2020–2022 Archived
Aldicarb sulfone MONITORING AND REPORTING — — 2020–2022 Archived
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2020–2022 Archived
Aldicarb MONITORING AND REPORTING — — 2020–2022 Archived
1,2-DIBROMO-3-CHLOROPROPANE MONITORING AND REPORTING — 0.0002 mg/L 2020–2022 Archived
ETHYLENE DIBROMIDE MONITORING AND REPORTING — 0.00005 mg/L 2020–2022 Archived
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2020–2022 Archived
Picloram MONITORING AND REPORTING — 0.5 mg/L 2020–2022 Archived
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2020–2022 Archived
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2020–2022 Archived
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2020–2022 Archived
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2018 Resolved
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2017–2019 Archived
Picloram MONITORING AND REPORTING — 0.5 mg/L 2017–2019 Archived
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2017–2019 Archived
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2017–2019 Archived
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2017–2019 Archived
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2017–2019 Archived
Aldicarb sulfoxide MONITORING AND REPORTING — — 2017–2019 Archived
Aldicarb sulfone MONITORING AND REPORTING — — 2017–2019 Archived
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2017–2019 Archived
Aldicarb MONITORING AND REPORTING — — 2017–2019 Archived
1,2-DIBROMO-3-CHLOROPROPANE MONITORING AND REPORTING — 0.0002 mg/L 2017–2019 Archived
ETHYLENE DIBROMIDE MONITORING AND REPORTING — 0.00005 mg/L 2017–2019 Archived
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

32 violations are on record since 2015, of which 3 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility City Of Rio Grande City
PWSID TX2140018
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 12,307
Service connections 7,337
Systems serving this area 5
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Rio Grande City tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Rio Grande City water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Rio Grande City? ▼
City Of Rio Grande City (PWSID TX2140018), one of 5 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2023-11-16. No significant deficiencies were recorded.

What Should Rio Grande City Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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