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EAST RIO HONDO WSC ARROYO CITY

PWS ID: TX0310031 · RIO HONDO, Texas 78583-0621

EAST RIO HONDO WSC ARROYO CITY serves 1,953 people in RIO HONDO, Texas using Surface Water water sources. It has 46 recorded EPA violations, including 8 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: EAST RIO HONDO WSC ARROYO CITY

EAST RIO HONDO WSC ARROYO CITY is a local-owned community water system that delivers drinking water to 1,953 residents in RIO HONDO, Texas (Cameron County) through 651 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 46 total violations for this system , of which 8 (17%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 27 monitoring and reporting violations are on file. The most recent violation on record dates to 2011.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, 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. EAST RIO HONDO WSC ARROYO CITY's 46 violations sit below the Texas average. Statewide, 1,068 of 1,147 UCMR5-tested systems have reported PFAS detections (93.1%). 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
1,953
Total Violations
46
Health-Based Violations
8
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
651
County
Cameron
School/Daycare
No
MCL Violations
8
Monitoring Violations
27
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule MR 9 2003
TTHM MCL 4 2005
Coliform (TCR) MCL 4 2011
Consumer Confidence Rule Other 3 2008
Coliform (TCR) MR 2 1992
Coliform (TCR) Other 2 1992
Methoxychlor MR 1 2011
Toxaphene MR 1 2011
Di(2-ethylhexyl) adipate MR 1 2011
Heptachlor MR 1 2011
Pentachlorophenol MR 1 2011
LASSO MR 1 2011
BHC-GAMMA MR 1 2011
Chlordane MR 1 2011
Hexachlorocyclopentadiene MR 1 2011
HEXACHLOROBENZENE MR 1 2011
Atrazine MR 1 2011
Simazine MR 1 2011
Heptachlor epoxide MR 1 2011
Di(2-ethylhexyl) phthalate MR 1 2011
Benzo(a)pyrene MR 1 2011
Endrin MR 1 2011

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 EAST RIO HONDO WSC ARROYO CITY.

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 TX0310031 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 EAST RIO HONDO WSC ARROYO CITY 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
2011 Coliform (TCR) MCL 4 SDWIS / TX0310031 / 3100
2011 Methoxychlor MR 1 SDWIS / TX0310031 / 2015
2011 Toxaphene MR 1 SDWIS / TX0310031 / 2020
2011 Di(2-ethylhexyl) adipate MR 1 SDWIS / TX0310031 / 2035
2011 Heptachlor MR 1 SDWIS / TX0310031 / 2065
2011 Pentachlorophenol MR 1 SDWIS / TX0310031 / 2326
2011 LASSO MR 1 SDWIS / TX0310031 / 2051
2011 BHC-GAMMA MR 1 SDWIS / TX0310031 / 2010
2011 Chlordane MR 1 SDWIS / TX0310031 / 2959
2011 Hexachlorocyclopentadiene MR 1 SDWIS / TX0310031 / 2042
2011 HEXACHLOROBENZENE MR 1 SDWIS / TX0310031 / 2274
2011 Atrazine MR 1 SDWIS / TX0310031 / 2050
2011 Simazine MR 1 SDWIS / TX0310031 / 2037
2011 Heptachlor epoxide MR 1 SDWIS / TX0310031 / 2067
2011 Di(2-ethylhexyl) phthalate MR 1 SDWIS / TX0310031 / 2039

How EAST RIO HONDO WSC ARROYO CITY Compares

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

Metric EAST RIO HONDO WSC ARROYO CITY Texas avg Federal benchmark
Total violations 46 101.5 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 8 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 1,953 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is EAST RIO HONDO WSC ARROYO CITY water safe to drink? ▼
EAST RIO HONDO WSC ARROYO CITY (PWS ID: TX0310031) has 46 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,953 people using Surface Water sources.
How many people does EAST RIO HONDO WSC ARROYO CITY serve? ▼
EAST RIO HONDO WSC ARROYO CITY serves 1,953 people in RIO HONDO, Texas. It is a Local-owned system using Surface Water water sources with 651 service connections.
What type of violations does EAST RIO HONDO WSC ARROYO CITY have? ▼
EAST RIO HONDO WSC ARROYO CITY has 46 total violations: 8 health-based violations (MCL exceedances or treatment failures), 27 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in EAST RIO HONDO WSC ARROYO CITY water? ▼
No PFAS testing data is available for EAST RIO HONDO WSC ARROYO CITY under the EPA's UCMR5 monitoring program.
What water source does EAST RIO HONDO WSC ARROYO CITY use? ▼
EAST RIO HONDO WSC ARROYO CITY 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.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

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