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Community Water System · PWS AR0000550

El Dorado Waterworks

El Dorado, Arkansas 71730 - drinking water served from groundwater sources to 17,932 people, tracked in EPA SDWIS and UCMR5.

17,932
People served
47
EPA violations
39
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 47 drinking-water violations at El Dorado Waterworks, 83% of them health-based - below the Arkansas per-system average.

47
Total EPA violations on record
83%
Health-based (MCL / treatment failure)
17,932
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: El Dorado Waterworks

El Dorado Waterworks is a local-owned community water system that delivers drinking water to 17,932 residents in El Dorado, Arkansas (Union County) through 8,333 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 47 total violations for this system , of which 39 (83%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 1 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 22 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Arkansas, EPA tracks 1,016 public water systems serving 3,049,400 people, with 53,437 cumulative violations and 21,598 health-based violations on record. About 94% of systems in the state carry at least one violation, and state-wide the average per system is 52.6 violations. Statewide, 57 of 172 UCMR5-tested systems have reported PFAS detections (33.1%).

El Dorado Waterworks's 47 violations sit below the Arkansas 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
17,932
Total Violations
47
Health-Based Violations
39
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
8,333
County
Union
School/Daycare
No
MCL Violations
39
Monitoring Violations
1
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 22 2009
Asbestos MCL 11 2021
TTHM MCL 6 2007
Revised Total Coliform Rule MON 1 2022

PFAS Testing Results (UCMR5)

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

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

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 AR0000550 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Arkansas Drinking Water Authority

Arkansas's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find AR regulator via EPA SDWIS

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
2022 Revised Total Coliform Rule MON 1 SDWIS / AR0000550 / 8000
2021 Asbestos MCL 11 SDWIS / AR0000550 / 1094
2009 Coliform (TCR) MCL 22 SDWIS / AR0000550 / 3100
2007 TTHM MCL 6 SDWIS / AR0000550 / 2950

How El Dorado Waterworks Compares

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

Metric El Dorado Waterworks Arkansas avg Federal benchmark
Total violations 47 52.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 39 21.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 33.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 17,932 3,001 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,016 regulated public water systems in Arkansas.

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 El Dorado Waterworks water safe to drink? ▼
El Dorado Waterworks (PWS ID: AR0000550) has 47 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 17,932 people using Groundwater sources.
How many people does El Dorado Waterworks serve? ▼
El Dorado Waterworks serves 17,932 people in El Dorado, Arkansas. It is a Local-owned system using Groundwater water sources with 8,333 service connections.
What type of violations does El Dorado Waterworks have? ▼
El Dorado Waterworks has 47 total violations: 39 health-based violations (MCL exceedances or treatment failures), 1 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in El Dorado Waterworks water? ▼
No. El Dorado Waterworks was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does El Dorado Waterworks use? ▼
El Dorado Waterworks uses Groundwater 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.