Onalaska, WI: 1 Health Violation - Home Safety 78/100
1 ZIP code · 3 water systems · Updated
ZipCheckup grade for Onalaska: B.
This ZIP has a few items worth a quick check.
Onalaska, WI scores in the upper band of the ZipCheckup grade.
How Onalaska Compares
Data: EPA SDWIS
Onalaska Water: The Quick Version
- Your city's water systems recorded 8 violations since 2021.
- Average of reported 90th-percentile lead results: 0.0109 mg/L.
- Homes built before 1986: 48% - older plumbing may contain lead solder.
- Estimated remediation: $800 per household.
- Health risk index (ZipCheckup composite of CDC data): 12.13.
Water Systems Serving Onalaska
Service in Onalaska, WI can differ by address: 3 water systems are tied to the area in federal records, and the 3 largest are listed with their violation records.
- B
- B
- B
Overview
We track home safety data for 1 ZIP code in Onalaska, Wisconsin (population ~24,619), covering 3 community water systems serving approximately 81,147 people region-wide. The EPA snapshots used for this build directly map water systems to 1 of 1 ZIP codes.
1 of 1 ZIP code with a reported violation count in the available EPA record (100%) have recorded EPA violations. 1 health-based violation appear in the available health breakdown.
Home Safety Score
Average Home Safety Score for Onalaska: B (78/100)
Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| PFAS MCL Screen | UCMR 5 testing against the covered federal MCLs |
| Radon Risk | EPA radon zone classification |
| Annual AQI | EPA AirData county-year median with at least 90 observed days |
Water Sources
Onalaska water systems draw from: Groundwater.
Lead & Copper
- Average of reported 90th-percentile lead results: 0.0109 mg/L (EPA action level: 0.015 mg/L)
- 0 of 1 ZIP code with known status exceed the EPA lead action level
Radon Risk
1 of 1 ZIP records with known zones is in EPA Radon Zone 2.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Lead and Copper Rule | Treatment Technique | 6 | 1 |
| Lead and Copper Rule Revisions | Treatment Technique | 6 | 1 |
| Public Notice Rule | Reporting | 4 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 54650 | B | 8 | 1 | Onalaska Waterworks |
All ZIP Codes in Onalaska
- 54650 [B] - 8 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
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
CDC Health Data for Onalaska
Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Onalaska
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Onalaska's Housing Stock?
With 48% of homes built before 1986, lead solder in plumbing is a potential concern. Federal law banned lead solder in drinking-water plumbing in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
For a household in Onalaska, a certified lab test of tap water answers what the median build year of 1982 cannot.
Most homes in Onalaska were built after 1986; lead exposure at a tap still depends on its service line and plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Onalaska: Remediation Cost in Perspective
Relative to home values, Onalaska remediation estimates run low.
Estimated remediation costs in Onalaska can be compared with local home values. The $450–$1,400 estimated range can be set against the median property value; actual costs vary by home. Home values are 21% above the Wisconsin average.
Protecting Children from Lead in Onalaska
Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Children's drinking water is worth testing in Onalaska: the ZIP-code average of systems' 90th-percentile readings for lead is no lower than ten parts per billion, and 48% of dwellings are pre-1986.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical Flood-Claim Evidence for Onalaska
Historical NFIP data for Onalaska contains 19 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $5,954. Among ZIP codes with claim records, 100% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.
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. The $800 remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.
Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.
Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.
Deep Dive Reports
Detailed analysis for Onalaska, WI