El Dorado Waterworks
EPA ID: AR0000550 · 17,932 people served · 6 ZIP codes
4 total violations across five years at El Dorado Waterworks — every finding closed, utility compliant today, 17,932 served.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 6 (2021) to 6 (2025). Violation counts have remained relatively steady.
Service Area Map
Coverage area for El Dorado Waterworks Source: EPA SDWIS service area boundaries.
Service area boundary — Grade A
Service Area Demographics
The El Dorado Waterworks serves a community with a median household income of $51,733 and an estimated 37,491 residents across its service area. Approximately 52% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 90% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
El Dorado Waterworks's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Union County, Arkansas rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Wastewater Proximity Note: This service area ranks in the 90th percentile nationally for proximity to wastewater discharge points.
Superfund Proximity Note: This service area ranks in the 80th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Detected Contaminants
How El Dorado Waterworks compares to EPA limits
What This Means For You
Uranium at 1 mg/L exceeds the EPA maximum of 0.03 mg/L. Kidney toxicity, increased cancer risk. Consider reverse osmosis filtration.
Haloacetic Acids (HAA5) at 1 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Consumer Confidence Report Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Uranium was detected in this water system. reverse osmosis filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Arkansas
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
El Dorado Waterworks (EPA ID: AR0000550) is a community water system in Arkansas that serves approximately 17,932 people from groundwater sources.
This system provides water to 6 ZIP codes across 5 communities.
Average Home Safety Score: A (88/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| April 1, 2023 | Unknown | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Uranium | Radionuclides | 1 | Yes |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 1 | Yes |
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
Health Risk Details
Uranium (EPA limit: 0.03 mg/L)
Kidney toxicity, increased cancer risk At-risk groups: people with kidney disease, pregnant women, rural residents on private wells in the western US.
Removal methods: reverse osmosis, ion exchange (anion exchange), lime softening. Find the right filter →
Haloacetic Acids (HAA5) (EPA limit: 0.06 mg/L)
Cancer risk; reproductive & developmental effects At-risk groups: pregnant women, infants, long-term consumers of chlorinated municipal water.
Removal methods: granular activated carbon (GAC), carbon block filter, reverse osmosis. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 5 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 1 additional ZIP inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 71730 — El Dorado
- 71731 — El Dorado
- 71749 — Junction City
- 71758 — Mount Holly
- 71762 — Smackover
- 71765 — Strong
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for El Dorado Waterworks (AR0000550) on EPA.gov.
Frequently Asked Questions
Is El Dorado Waterworks water safe to drink?
El Dorado Waterworks has recorded 2 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does El Dorado Waterworks serve?
El Dorado Waterworks serves approximately 17,932 people across 6 ZIP codes in Arkansas.
Where does El Dorado Waterworks get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
El Dorado Waterworks (EPA ID: AR0000550) — request the latest Consumer Confidence Report or ask about specific contaminants.