Home hazard report for 54303 — Green Bay, WI
ZIP 54303 is served by Howard Waterworks: 2 violations since 2016, latest lead result 1.2 ppb, PFAS not detected. Brown County is in EPA radon zone 2.
Health-based violations since 2016: Groundwater Rule, Lead and Copper Rule Revisions. All are listed as resolved.
90th-percentile lead in the latest round (Jun 2023). Lead comes mostly from household plumbing and service lines, so individual homes can be higher.
None of the tested PFAS were found above EPA’s reporting limits in 2023–2025.
Predicted average indoor radon between 2 and 4 pCi/L. Test your home; many homes here exceed 4 pCi/L.
FEMA’s overall natural-hazard risk for this census tract, relative to the rest of the U.S.
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code.
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Where ZIP 54303 is
Dashed: ZIP area · blue: utility service area · scroll or pinch to zoomDrinking water: Howard Waterworks
Health-based violations
| Contaminant or rule | Health-based violations since 2016 |
|---|---|
| Groundwater Rule | 1 |
| Lead and Copper Rule Revisions | 1 |
A health-based violation means a contaminant exceeded its legal limit (MCL) or a required treatment technique was not met, as reported by the state to EPA’s SDWIS. All are listed as resolved or archived; the latest began Oct 2024.
Full record for Howard Waterworks →
Other systems overlapping this ZIP: Green Bay Waterworks.
Lead
90th-percentile lead per sampling round (90% of the homes sampled were at or below this level). Black line: EPA’s 15 ppb action level; under the Lead and Copper Rule Improvements the action level becomes 10 ppb from 2027.
PFAS (“forever chemicals”)
| Compound | Highest result | Samples with detection | EPA limit |
|---|---|---|---|
| PFHxA | not detected | 0 of 8 | — |
| HFPO-DA (GenX) | not detected | 0 of 8 | — |
| PFBA | not detected | 0 of 8 | — |
| PFDA | not detected | 0 of 8 | — |
| PFPeA | not detected | 0 of 8 | — |
| PFBS | not detected | 0 of 8 | — |
| PFHpA | not detected | 0 of 8 | — |
| PFHxS | not detected | 0 of 8 | — |
| PFNA | not detected | 0 of 8 | — |
| PFOS | not detected | 0 of 8 | 4 ppt MCL |
| PFOA | not detected | 0 of 8 | 4 ppt MCL |
EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR 5), samples 2023–2025; ppt = parts per trillion (ng/L). The 4.0 ppt maximum contaminant levels for PFOA and PFOS were set by EPA in 2024; water systems have until the end of the decade to comply.
Radon in Brown County
EPA radon zone 2 — moderate potential. Predicted average indoor radon between 2 and 4 pCi/L. Test your home; many homes here exceed 4 pCi/L.
Radon is a colorless, odorless radioactive gas from soil and rock, and the leading cause of lung cancer among non-smokers. EPA recommends fixing a home at 4 pCi/L or above and considering it from 2 pCi/L. A short-term test kit costs about $15–30. How radon zones work →
Natural hazard risk
FEMA rates the overall natural-hazard risk of this neighborhood (census tract) as Relatively Low, with very low social vulnerability and very high community resilience.
FEMA National Risk Index (December 2025): expected annual losses from each hazard combined with social vulnerability and community resilience, rated relative to all U.S. census tracts. Hazards not listed are not applicable here. It describes the area, not a single building; flood insurance maps (FEMA FIRMs) decide flood-insurance requirements.
Live conditions: river gauges and flood levels · tornado warnings · wildfire detections · earthquakes — our sister maps, updated from NOAA, USGS and NASA every few minutes.
Superfund sites nearby
| Site | Status | Distance |
|---|---|---|
| Fox River NRDA/PCB Releases Green Bay, Wisconsin · EPA ID WI0001954841 | Proposed | 2.4 mi |
| Better Brite Plating Chrome & Zinc Shops DePere, Wisconsin · EPA ID WIT560010118 | Active (final NPL) | 7.4 mi |
EPA Superfund National Priorities List (NPL): the country’s most serious known hazardous-waste sites, each with an EPA cleanup record (linked). Distance is measured from the ZIP center to the site’s reference point; being near a site does not by itself mean exposure — EPA site pages describe what was found and how it is being cleaned up.
What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.
Questions about 54303
Who supplies drinking water to ZIP 54303?
Howard Waterworks (EPA ID WI4050468), a surface water (rivers, lakes) system serving about 21,133 people.
Is there lead in Green Bay, WI tap water?
The utility’s latest 90th-percentile lead result (Jun 2023) was 1.2 ppb; EPA’s action level is 15 ppb, falling to 10 ppb from 2027. Lead mostly comes from service lines and home plumbing, so the only way to know your tap is to test it.
Does Green Bay, WI water have PFAS?
None of the tested PFAS were found above EPA’s reporting limits in 2023–2025.
Has the water system in 54303 had violations?
Health-based violations since 2016: Groundwater Rule, Lead and Copper Rule Revisions. All are listed as resolved.
What natural hazards affect ZIP 54303?
FEMA’s National Risk Index rates the overall natural-hazard risk here as Relatively Low; the highest-rated hazards are cold wave (relatively high), hail (relatively moderate), lightning (relatively moderate).
Are there Superfund sites near 54303?
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code. Sites within 10 miles: Fox River NRDA/PCB Releases (2.4 mi, Proposed); Better Brite Plating Chrome & Zinc Shops (7.4 mi, Active (final NPL)).
Is radon a problem in Brown County?
Brown County is in EPA radon zone 2 (moderate potential). Predicted average indoor radon between 2 and 4 pCi/L. Test your home; many homes here exceed 4 pCi/L.