Green Bay, WI: 24 Health Violations — 78/100 (2026)
12 ZIP codes · 12 water systems · Updated 2026-06-03
How does Green Bay tap water hold up under EPA scrutiny? Above average for WI — documented violations are uncommon and the safety grade reflects a clean overall record.
How Green Bay Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Green Bay, WI
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Distribution of water safety grades across Green Bay.
Green Bay Water: The Quick Version
- Your city's water systems recorded 72 violations in the past 5 years.
- Average lead level: 0.0025 mg/L.
- Estimated remediation: $1,400 per household.
- CDC health risk index: 12.63 — above typical levels.
Water Systems Serving Green Bay
3 independent water providers serve Green Bay, WI — 12 systems appear in federal records.
Overview
We track water quality and home safety data for 12 ZIP codes in Green Bay, Wisconsin, covering 12 community water systems serving approximately 188,379 people.
12 of 12 ZIP codes (100%) have recorded EPA violations. 24 health-based violations documented.
Home Safety Score
Average Home Safety Score for Green Bay: B (78/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Green Bay water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0025 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 12 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 13 | 12 |
| Gross Beta | Radionuclides | 13 | 12 |
| Stage 2 DBP Rule | Treatment Technique | 13 | 12 |
| Lead and Copper Rule | Treatment Technique | 13 | 12 |
| Consumer Confidence Report Rule | Reporting | 13 | 12 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 54301 | B | 6 | 2 | Green Bay Waterworks |
| 54302 | B | 6 | 2 | Green Bay Waterworks |
| 54303 | B | 6 | 2 | Green Bay Waterworks |
| 54304 | B | 6 | 2 | Green Bay Waterworks |
| 54305 | B | 6 | 2 | Green Bay Waterworks |
| 54306 | B | 6 | 2 | Green Bay Waterworks |
| 54307 | B | 6 | 2 | Allouez Waterworks |
| 54308 | B | 6 | 2 | Green Bay Waterworks |
| 54311 | B | 6 | 2 | Green Bay Waterworks |
| 54313 | B | 6 | 2 | Green Bay Waterworks |
All ZIP Codes in Green Bay
- 54301 [B] — 6 violations ⚠
- 54302 [B] — 6 violations ⚠
- 54303 [B] — 6 violations ⚠
- 54304 [B] — 6 violations ⚠
- 54305 [B] — 6 violations ⚠
- 54306 [B] — 6 violations ⚠
- 54307 [B] — 6 violations ⚠
- 54308 [B] — 6 violations ⚠
- 54311 [B] — 6 violations ⚠
- 54313 [B] — 6 violations ⚠
- 54324 [B] — 6 violations ⚠
- 54344 [B] — 6 violations ⚠
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Green Bay
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Green Bay
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Green Bay: Remediation Cost in Perspective
For most homeowners in Green Bay, the estimated cost of water and safety remediation represents a proportionally modest share of what properties are worth — placing this area in the lower tier of the remediation share scale.
Remediation costs in Green Bay are relatively low compared to home values. The $617–$2,450 estimated range is a small fraction of median property value. Home values are 11% below the Wisconsin average.
Protecting Children from Lead in Green Bay
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Lead risk in Green Bay appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Green Bay
Measured across the NFIP's multi-decade tracking period, Green Bay shows a moderate flood record — 309 claims and 58% of ZIP codes carrying FEMA flood zone status. For water quality, that combination matters because flood events at this frequency can periodically stress infrastructure: treatment plants, private wells, and distribution systems all face elevated risk during significant flooding.
Green Bay has a moderate flood history with 309 FEMA claims averaging $4,447 per payout. 58% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,400</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Green Bay, WI