Public water system record
El Dorado Waterworks
Serves an area of Union County, AR that includes El Dorado · 17,932 people served
Federal records show 4 health-based violations and 1 monitoring/reporting issue for El Dorado Waterworks in the last ten years. The most serious issue in this window was a Total Trihalomethanes (TTHMs) violation that EPA lists as archived, not resolved.
System profile
- Health-based violations, last 10 years
- 4
- Resolved
- 3
- Unresolved
- 0
- Archived by EPA
- 1
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- El Dorado Waterworks draws water from 9 wells.
- Highest measured level in the last 10 years: Asbestos, 45 million fibers per liter, federal limit 7 million fibers per liter (6.4 times the limit), 2020.
- Most recent formal enforcement: compliance order (no penalty) by Arkansas, February 2021.
- Record on file since 2003, with 7 health-based violations before October 19, 2016.
Check whether El Dorado Waterworks serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 81 µg/L, federal limit 80 µg/L (at or just above the limit)
|
220 | Jul 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Asbestos
Contaminant limit exceeded
Measured 9.8 million fibers per liter, federal limit 7 million fibers per liter (1.4 times the limit)
|
330 | Jan 1, 2021 | Resolved | No |
|
Asbestos
Contaminant limit exceeded
Measured 45 million fibers per liter, federal limit 7 million fibers per liter (6.4 times the limit)
|
330 | Oct 1, 2020 | Resolved | No |
|
Asbestos
Contaminant limit exceeded
Measured 45 million fibers per liter, federal limit 7 million fibers per liter (6.4 times the limit)
|
330 | Jul 1, 2020 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Revised Total Coliform Rule
Monitoring violation
|
Nov 1, 2022 | Resolved |
Full record since 2003
EPA's records for El Dorado Waterworks go back to 2003. Before October 19, 2016 they list 7 health-based violations (7 resolved) and no monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2000s | 7 | 0 |
| 2020s | 4 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform, began December 2009, Resolved.
Show all 7 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 2009 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Apr 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2007 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2007 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Apr 1, 2007 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2003 | Resolved |
Enforcement actions
Arkansas regulators took 1 formal enforcement action against El Dorado Waterworks in 2021. The most recent was a compliance order (no penalty) in February 2021.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Feb 24, 2021 | Arkansas | Compliance order (no penalty) | 2 violations (2 health-based): Asbestos |
What the violations mean
Asbestos
3 incidentsAsbestos exceeded the federal limit
Long-term exposure above the limit may increase the risk of benign intestinal polyps
Total Trihalomethanes (TTHMs)
1 incidentDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
El Dorado Waterworks draws water from 9 wells. 5 other community water systems and 2 smaller public systems such as schools, businesses or campgrounds buy water from El Dorado Waterworks. 2 other public water systems have emergency connections to El Dorado Waterworks.
Community systems that buy water from it
- Harmony Water Association El Dorado, AR
- Johnson Township Water Assoc Strong, AR
- Oak Manor Water Association El Dorado, AR
- Old Union Public Water Authority El Dorado, AR
- Quinn Water Association Eldorado, AR
Annual water quality report
El Dorado Waterworks must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Arkansas.
Certified drinking water labs by state EPA guidance for private wells