Larkspur, CA Home Safety: Home Safety 100/100
2 ZIP codes · 1 water system · Updated
ZipCheckup grade for Larkspur: A.
Checked records flag no major concern; missing data is unknown.
Within Larkspur, CA, the available records add up to an upper-tier grade; that grade describes records, not the water at a given faucet.
How Larkspur Compares
Data: EPA SDWIS
Water Systems Serving Larkspur
Which water system serves a particular address in Larkspur, CA? The water bill or the utility can confirm it; the list here shows one system, and federal data link 1 in total.
- A
Overview
We track home safety data for 2 ZIP codes in Larkspur, California (population ~7,372), covering 1 community water system serving approximately 186,895 people region-wide. The EPA snapshots used for this build directly map water systems to 1 of 2 ZIP codes.
The available EPA record reports 0 violations for 1 ZIP code with a reported violation count.
Home Safety Score
Average Home Safety Score for Larkspur: A (100/100)
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
Larkspur 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
2 of 2 ZIP records with known zones are in EPA Radon Zone 3.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 94939 | A | Marin Municipal Water District | 186,895 |
All ZIP Codes in Larkspur
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 Larkspur
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
Historical Flood-Claim Evidence for Larkspur
Historical NFIP data for Larkspur contains 101 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $24,076. 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.
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 Larkspur, CA