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WaterSafeCheck

ZIP Code 54903 Water Quality Report

Oshkosh, WI · Winnebago County County

Safety Score
C

Water Safety Grade

Fair — Some compliance concerns

Health Violations

2

Total Violations

12

Lead Risk

N/A

Contaminants

1

⚠

Active Water Quality Issues Detected

EPA records show 7 unresolved violations. Contact Oshkosh Waterworks for current status.

About Tap Water in ZIP Code 54903

Tap water in ZIP code 54903 (Oshkosh, WI) receives a C grade (score: 60/100) based on EPA monitoring data. While the water from Oshkosh Waterworks is treated and regulated, this area has a moderate violation history that residents should be aware of.

Water System

Oshkosh Waterworks

EPA ID: WI4710457

Water Source

Surface Water

Population Served

63,000 residents

County

Winnebago County County, Wisconsin

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Lead Levels in ZIP 54903

EPA action level: 15 ppb | Public health goal: 0 ppb

Lead Level: 11.0 ppb — Approaching Action Level

The 90th percentile lead level in 54903 is 11.0 ppb, approaching the EPA action level of 15 ppb. When a water system's 90th percentile exceeds this threshold, the utility is required to take corrective action including public notification and infrastructure upgrades. Residents — especially those with children or in homes built before 1986 — should use a certified lead-reducing filter (NSF/ANSI 53 or 58) for drinking and cooking water.
Lead Level (90th percentile)
11.00 ppb (0.011 mg/L)
Lead Exposure Risk Rating
Unknown
Note: Lead levels above are the 90th percentile from EPA monitoring — meaning 90% of samples were at or below this level. Even "undetected" tap water lead doesn't account for lead leaching from home plumbing. If your home was built before 1986, individual tap testing is recommended.
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Violation History

Past 5 years — EPA SDWIS data

Oshkosh Waterworks has recorded 2 health-based violations in the past 5 years. Multiple health violations suggest recurring compliance challenges. Residents should request a copy of the annual Consumer Confidence Report to understand what contaminants were involved and what corrective actions were taken. 7 violations are currently unresolved — meaning the issue has not yet been formally corrected in EPA records. This is a serious concern that residents should follow up on with their water utility.

Total Violations (5 yr)
12
Health-Based Violations
2
Unresolved Violations
7
Boil Water Advisories
0
Compliance Risk
Critical

Regulatory compliance risk is rated Critical — the highest risk category. Oshkosh Waterworks has an extensive history of unresolved violations and enforcement actions. Independent water testing is highly recommended.

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Contaminants Detected

Contaminants with health-based violations on record

EPA records identify 1 contaminant associated with health-based violations in ZIP code 54903: Stage 2 DBP Rule. These contaminants exceeded the Maximum Contaminant Levels (MCLs) established by the EPA under the Safe Drinking Water Act at some point in the 5-year monitoring period. The presence of these violations does not necessarily mean water is currently unsafe — water systems are often required to increase monitoring and treatment when violations occur. Review the annual Consumer Confidence Report for the most current status.

Stage 2 DBP Rule

⚖ Enforcement Actions

10 enforcement actions have been issued against Oshkosh Waterworks — a high number that reflects sustained compliance struggles. Enforcement actions escalate from administrative orders to financial penalties when utilities repeatedly fail to meet safe drinking water standards.
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Water Source & Environmental Factors

Surface Water

This system draws water from lakes, rivers, or reservoirs. Surface water is treated to remove sediment, microorganisms, and chemical contaminants before reaching taps.

Water Source Type
Surface Water
EPA Radon Zone

Moderate potential

Zone 2

EPA Radon Zone 2 — moderate radon potential. The EPA recommends testing your home regardless of zone designation.

🛡 What Should You Do? — ZIP 54903 Recommendations

  • ⚠ Use a certified NSF/ANSI 53 filter for drinking and cooking water if you have young children
  • ⚠ Never give unfiltered tap water to infants in formula — use certified bottled or filtered water
  • ⚠ Request a copy of the Consumer Confidence Report to see what was detected and when
  • ⚠ Call the EPA Safe Drinking Water Hotline: 1-800-426-4791

Frequently Asked Questions — ZIP 54903 Water Quality

Is tap water safe to drink in ZIP code 54903?+
Tap water in 54903 (Oshkosh, WI) is treated and regulated, but has a grade of C due to past violations. For most healthy adults, treated tap water is generally safe. Families with infants, young children, or immunocompromised individuals may want to use a certified water filter as a precaution.
What is the lead level in 54903 tap water?+
The 90th percentile lead level in 54903 is 11.0 ppb (parts per billion). The EPA action level is 15 ppb. This is below the action level, but some health experts recommend a lead filter for families with young children.
Who provides tap water to 54903?+
Tap water in ZIP code 54903 is provided by Oshkosh Waterworks (EPA ID: WI4710457). This system serves approximately 63,000 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.
What is the water source for 54903?+
ZIP code 54903 is served by surface water. Surface water systems draw from rivers, lakes, or reservoirs and must meet strict EPA treatment requirements including filtration and disinfection.
Does 54903 have any active water quality violations?+
Yes — there are currently 7 unresolved violations on record for this water system. Unresolved violations indicate issues that have not yet been formally corrected in EPA tracking systems. Contact Oshkosh Waterworks for the latest update.
How do I get a copy of my water quality report for 54903?+
Your water utility — Oshkosh Waterworks — is required by law to send you an annual Consumer Confidence Report (CCR) by July 1 each year. You can also request it directly from the utility or find it online by searching "Oshkosh Waterworks Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.
What water filter should I use in 54903?+
The right filter depends on what contaminants are present. For lead, look for a filter certified to NSF/ANSI Standard 53. For chlorine byproducts (like THMs), NSF/ANSI 42 filters work well. For a broad range of contaminants including PFAS, look for NSF/ANSI 58 (reverse osmosis) systems. For ZIP code 54903, with detected contaminants including Stage 2 DBP Rule, a multi-stage filter or reverse osmosis system is recommended.
Is 54903 tap water safe for babies and infants?+
Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Given the detected lead level of 11.0 ppb in 54903, we recommend using a certified NSF/ANSI 53 water filter or certified bottled water for preparing infant formula. Always consult your pediatrician for guidance specific to your child's health.

Data Sources & Methodology

Water quality data for ZIP code 54903 is compiled from the EPA Safe Drinking Water Information System (SDWIS), EPA ECHO enforcement database, UCMR5 unregulated contaminant monitoring, and Consumer Confidence Reports filed by Oshkosh Waterworks. Safety scores are composite metrics derived from violation history, lead levels, enforcement actions, and infrastructure risk indicators. Data reflects a 5-year monitoring window. Last dataset update: 2024. View EPA source data →