Belvedere Tiburon, CA Water Safety: 60/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
While Belvedere Tiburon avoids CA's lowest safety tiers, a portion of its water systems have logged documented violations.
How Belvedere Tiburon Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Belvedere Tiburon Water
- Homes built before 1986: 84% — older plumbing may contain lead solder.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 10.78.
Who Supplies Your Water in Belvedere Tiburon
Water delivery in Belvedere Tiburon, CA is handled by 2 utilities rather than a single system — drawn from 2 providers in federal records, each filing its own compliance reports and setting its own rates.
Overview
We track water quality and home safety data for 1 ZIP code in Belvedere Tiburon, California (population ~12,682), covering 2 community water systems serving approximately 205,342 people region-wide.
No EPA violations recorded across any ZIP codes in Belvedere Tiburon — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Belvedere Tiburon: C (60/100)
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
Belvedere Tiburon water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Belvedere Tiburon
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 94920 | C | Marin Municipal Water District | 186,895 |
All ZIP Codes in Belvedere Tiburon
- 94920 [C]
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.
Health Outcomes in Belvedere Tiburon
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
Housing & Infrastructure in Belvedere Tiburon
With 84% 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
When more than half a city's housing predates the 1986 federal ban on lead solder, plumbing-era lead risk becomes a citywide concern rather than an exception. Belvedere Tiburon's median build year of 1962 places it squarely in that category.
Over half of homes in Belvedere Tiburon 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.
Cost Context: What Remediation Means for Belvedere Tiburon Homeowners
In Belvedere Tiburon, the equity impact of remediation is proportionally small — not the kind of financial commitment that rises to the level of a genuine planning constraint, but a minor share of what most properties here are worth.
Remediation costs in Belvedere Tiburon are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 171% above the California average.
Lead Exposure Risk for Children in Belvedere Tiburon
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.
Even where utility-side monitoring meets Lead and Copper Rule requirements, the 84% pre-rule share in Belvedere Tiburon keeps interior-plumbing variation as a household-level question that aggregate data cannot resolve.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Belvedere Tiburon
Over the multi-decade window covered by the National Flood Insurance Program, Belvedere Tiburon has accumulated 118 claims — a total that suggests more than isolated flood exposure. With 100% of ZIP codes in designated flood zones, the water-quality implications of flooding move from hypothetical to periodically relevant: treatment intake can be compromised, wells can be infiltrated, and distribution backflow can occur.
Belvedere Tiburon has a moderate flood history with 118 FEMA claims averaging $10,401 per payout. 100% 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>$1,200</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.
What You Can Do in Belvedere Tiburon
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. With 84% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Belvedere Tiburon, CA