Cotati, CA: 2 Violations - Home Safety 99/100
1 ZIP code · 4 water systems · Updated
ZipCheckup grade for Cotati: A.
No federal data flags a major home-safety concern for this ZIP.
Cotati, CA: reliable drinking water, above-average safety record, few violations.
How Cotati Compares
Data: EPA SDWIS
Cotati Water: The Quick Version
- Your city's water systems recorded 2 violations in the past 5 years.
- Homes built before 1986: 63% - older plumbing may contain lead solder.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 11.32.
Water Systems Serving Cotati
Cotati, CA draws its residential water from 3 separate providers among the 4 federally tracked systems. Each operates independently, with its own infrastructure, rate structure, and compliance record.
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Overview
We track home safety data for 1 ZIP code in Cotati, California (population ~9,320), covering 4 community water systems serving approximately 113,647 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 Cotati: A (99/100)
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
Cotati water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0000 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
Dominant radon zone: Zone 3 (Low Risk)
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Barium | Inorganic | 2 | 1 |
| Consumer Confidence Report Rule | Reporting | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 94931 | A | 2 | 0 | City of Cotati, |
All ZIP Codes in Cotati
- 94931 [A] - 2 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 Cotati
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 Cotati
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Cotati's Housing Stock?
With 63% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Cotati's housing stock is predominantly older, with a median build year of 1988 that reflects decades of construction before federal plumbing standards were tightened. The 1986 ban on lead solder and the pre-1970 era of lead service lines are both relevant benchmarks here - a significant share of the residential inventory predates one or both of those cutoffs, creating an elevated baseline for plumbing-related lead risk that aggregate water quality data may not fully reflect at the household level.
Over half of homes in Cotati were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Cotati: Remediation Cost in Perspective
Setting Cotati remediation figures against its property market, the resulting ratio sits comfortably in the low tier - a classification that reflects the kind of household financial position where most homeowners can identify documented issues, schedule the work, and absorb the cost without it registering as a significant budget disruption.
Remediation costs in Cotati are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 7% above the California average.
Protecting Children from Lead in Cotati
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.
Pulling a tap sample fills the gap that utility data cannot close, particularly here where 63% of housing dates from the pre-rule era and citywide monitoring sits at or above the regulatory mark in Cotati.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical Flood-Claim Evidence for Cotati
Historical NFIP data for Cotati contains 6 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $3,426. 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 <strong>$1,200</strong> 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 Cotati, CA