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OSWEGO, Kansas Tap Water Quality

1,965 people served · 2 water systems

D
Poor

OSWEGO, Kansas is a rural community with 1,965 residents served by 2 public water systems. Water service covers ZIP code 67356.

OSWEGO 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 Coliform Bacteria and Arsenic among the regulated contaminants associated with OSWEGO'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

Health-Based Violations (Last 5 Years)

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

Arsenicchemical

EPA Code 1009 · Maximum Contaminant Level Exceedance

4

violations

EPA Limit

0.01 mg/L

Last Reading

1.02 MG/L

First Reported

Jul 2021

Most Recent

Jul 2021

What this violation means

Arsenic is a known human carcinogen that occurs naturally in groundwater across many parts of the United States, especially the Southwest and parts of New England. Long-term exposure even at low levels has been linked to bladder, lung, and skin cancer, as well as cardiovascular disease and developmental effects in children.

Recommended precautions

  • Reverse osmosis filtration removes arsenic effectively.
  • Distillation also removes arsenic — point-of-use distillers work for drinking and cooking water.
  • Boiling does NOT remove arsenic. It actually concentrates it as water evaporates.
  • If your well water has arsenic, test annually and treat at the point of entry.

EPA Code 8000 · Treatment Technique Violation

4

violations

EPA Limit

0 per 100 mL presence/absence

Last Reading

First Reported

Apr 2021

Most Recent

Apr 2021

What this violation means

Total coliform bacteria are themselves usually harmless, but their presence signals that the water distribution system has a vulnerability — typically a cracked pipe, loss of pressure, or back-siphonage — that could allow disease-causing pathogens to enter. Repeated coliform-positive samples trigger mandatory utility investigation.

Recommended precautions

  • If your utility issues a boil-water advisory, boil all drinking and cooking water for at least one minute.
  • Use bottled water until the advisory is lifted.
  • Ice from icemakers and beverages made before the advisory should be discarded.
  • UV light and chlorination both kill coliform bacteria — most home filters do not.

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 OSWEGO

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 OSWEGO, Kansas tap water safe to drink?

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

How many EPA violations does OSWEGO have?

OSWEGO has 8 EPA health-based water violations in the last 5 years across 2 water systems serving 1,965 people.

What contaminants have been found in OSWEGO water?

The following EPA-regulated contaminants have been detected: 8000, 1009. View details about each contaminant, health effects, and recommended precautions above in the violations table.

Should I use a water filter in OSWEGO?

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 OSWEGO?

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.

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