EL DORADO, Kansas Tap Water Quality

17,781 people served · 4 water systems

Poor

EL DORADO, Kansas is a small city with 17,781 residents served by 4 public water systems. Water service covers ZIP code 67042.

EL DORADO has a notable pattern of EPA health-based violations across multiple compliance periods. Filtered water is a reasonable precaution while the utility implements long-term corrective action.

EPA reporting identifies Haloacetic Acids (HAA5) among the regulated contaminants associated with EL DORADO's recent health-based violations. Each contaminant has different sources, health implications, and recommended mitigation steps — links to the full EPA reference for each are listed alongside the violation history below.

Last updated: 2026-05-18 · Source: EPA SDWIS

Location

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Centered on ZIP-code centroids of water systems serving this city.

ZIP Codes Served

67042

Health-Based Violations (Last 5 Years)

EPA Maximum Contaminant Level exceedances reported by water systems serving EL DORADO. Each entry explains the contaminant, the health risk, and recommended precautions, and links to a full guide.

Haloacetic Acids (HAA5)disinfectant

EPA Code 2456 · Maximum Contaminant Level Exceedance

violations

EPA Limit

0.06 mg/L

Last Reading

.07 MG/L

First Reported

Jan 2021

Most Recent

Apr 2021

What this violation means

Haloacetic Acids (HAA5) are the second major group of disinfection byproducts after TTHMs. They form by the same mechanism — chlorine reacting with organic matter — and pose similar long-term cancer risks. Utilities are required to test quarterly at distribution-system locations to track HAA5 levels.

Recommended precautions

→Activated carbon filtration removes most HAA5.
→Reverse osmosis is highly effective.
→Unlike TTHMs, HAA5 do not significantly off-gas. Use treatment rather than aeration.
→Long-term ingestion is the primary concern, not short-term skin contact.

Read the complete guide to Haloacetic Acids (HAA5)

Source: EPA Safe Drinking Water Information System (SDWIS). Health-based violations only. Older violations may have been resolved; check your utility's most recent Consumer Confidence Report for current status.

Water Systems Serving EL DORADO

BUTLER CO RWD 2

PWSID: KS2001505

1,534 served

8 violations

BUTLER CO RWD 6

PWSID: KS2001530

2,655 served

EL DORADO, CITY OF

PWSID: KS2001511

12,810 served

BUTLER CO RWD 1

PWSID: KS2001514

782 served

What Can You Do?

✅ Request your utility's annual Consumer Confidence Report (CCR) — required by law.
✅ Use an NSF-certified water filter if violations involve lead, arsenic, or PFAS.
✅ Run cold water for 30 seconds before drinking if you have older plumbing (reduces lead).
✅ Check back monthly — we update data from the EPA every 30 days.

About this data

This overview reflects EPA SDWIS data published as of 2026-05-18. It covers active Community Water Systems (CWS) that exceeded federal Maximum Contaminant Levels during the past five-year EPA reporting window. For up-to-the-minute information, request a current Consumer Confidence Report from your utility, or review the EPA's public dashboard.

Frequently Asked Questions

Is EL DORADO, Kansas tap water safe to drink?▼

This city's water had significant EPA violations in the last 5 years.

How many EPA violations does EL DORADO have?▼

EL DORADO has 8 EPA health-based water violations in the last 5 years across 4 water systems serving 17,781 people.

What contaminants have been found in EL DORADO water?▼

The following EPA-regulated contaminants have been detected: 2456. View details about each contaminant, health effects, and recommended precautions above in the violations table.

Should I use a water filter in EL DORADO?▼

Using an NSF-certified water filter is recommended if your area has violations involving lead, arsenic, or PFAS. For other contaminants, consult your local water utility. Check the annual Consumer Confidence Report (CCR) for detailed guidance.

What should I do if there are violations in EL DORADO?▼

Request your water utility's annual Consumer Confidence Report (CCR), which is required by the EPA. Follow the utility's guidance on boil water advisories. Run cold water for 30 seconds before drinking if you have older plumbing. Use an NSF-certified filter if needed based on your water system's violations.