Cos Cob, CT: 24 Violations - Home Safety 50/100
1 ZIP code · 1 water system · Updated
ZipCheckup grade for Cos Cob: D.
Federal records show several conditions worth reviewing.
Because the grade blends several data sources, a D or F for Cos Cob, CT does not by itself say which one drove it; the ZIP-level reports show the underlying data.
How Cos Cob Compares
Data: EPA SDWIS
What You Should Know About Cos Cob Water
- Your city's water systems recorded 24 violations since 2021.
- Homes built before 1986: 77% - older plumbing may contain lead solder.
- Estimated remediation: $500 per household.
Who Supplies Your Water in Cos Cob
Listed supplier for Cos Cob, CT: one system, of 1 on federal record.
- D
Overview
We track home safety data for 1 ZIP code in Cos Cob, Connecticut (population ~7,667), covering 1 community water system serving approximately 351,756 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. The available record reports no health-based violations for this measured scope.
Home Safety Score
Average Home Safety Score for Cos Cob: D (50/100)
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
Cos Cob water systems draw from: Surface water.
Lead & Copper
- Average of reported 90th-percentile lead results: reported as 0 mg/L (a reported 0 is not proof of no lead; check the source record for its reporting limit) (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 1.
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 |
|---|---|---|---|
| Arsenic | Inorganic | 4 | 1 |
| Barium | Inorganic | 4 | 1 |
| Cadmium | Inorganic | 4 | 1 |
| Chromium | Inorganic | 4 | 1 |
| Cyanide | Inorganic | 4 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 06807 | D | 24 | 0 | Aquarion-eastern Fairfield County |
All ZIP Codes in Cos Cob
- 06807 [D] - 24 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.
Top Contaminants in Cos Cob Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Cos Cob
With 77% 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
Viewed through the lens of construction era, Cos Cob has a median build year of 1966; houses completed ahead of 1986 can hold lead-bearing solder or fittings.
Over half of homes in Cos Cob were built before 1986, when federal law began restricting lead solder in drinking-water plumbing. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Cos Cob Homeowners
In Cos Cob, estimated remediation comes to 1% or less of the median home value.
Estimated remediation costs in Cos Cob can be compared with local home values. The $300–$800 estimated range can be set against the median property value; actual costs vary by home. Home values are 201% above the Connecticut average.
Lead Exposure Risk for Children in Cos Cob
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.
If you have young children or are pregnant, consider testing your home's water - especially if your home was built before 1986.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical NFIP Claim Context in Cos Cob
Historical NFIP data for Cos Cob contains 124 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $19,641. 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 $500 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.
What You Can Do in Cos Cob
- Test your water at home. City-level data shows averages - your tap may differ. Check the certification, price and turnaround time of any water test kit or lab service.
- Install a certified water filter. For Arsenic, listed in the water-quality records for Cos Cob: if it is a rule or reporting requirement rather than a contaminant, ask your utility what the record involved; for bacteria, follow any boil-water notice from your utility; for a specific chemical contaminant, check whether a filter is certified to reduce it. Not every contaminant has a consumer filter certification.
- Check your home's plumbing. With 77% of homes built before 1986, lead solder is a real possibility.
- Review your water system's CCR. If you use a community water system, request its annual Consumer Confidence Report for system-level test results or find it online.
Deep Dive Reports
Detailed analysis for Cos Cob, CT