Tomales, CA Water Safety: 88/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
Although water quality varies across any metro, Tomales's systems collectively post above-average compliance scores for CA — and documented violations are few.
How Tomales Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Tomales Residents
- Homes built before 1986: 60% — older plumbing may contain lead solder.
- CDC health risk index: 10.78.
Tomales's Water Providers
2 independent water providers serve Tomales, CA — 2 systems appear in federal records.
Overview
We track water quality and home safety data for 1 ZIP code in Tomales, California (population ~315), covering 2 community water systems serving approximately 61,726 people region-wide.
No EPA violations recorded across any ZIP codes in Tomales — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Tomales: A (88/100)
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
Tomales water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Tomales
- 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 |
|---|---|---|---|
| 94971 | A | NORTH MARIN WATER DISTRICT | 61,691 |
All ZIP Codes in Tomales
- 94971 [A]
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.
Tomales Community Health Snapshot
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
Tomales Infrastructure Age
With 60% 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
Because the majority of Tomales's housing predates 1986, when lead solder was banned from new plumbing, the median build year of 1961 reflects a city where lead-era plumbing materials are common rather than exceptional.
Over half of homes in Tomales 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.
Tomales: Lead Risk & Vulnerable Populations
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.
Older stock in Tomales represents 60% of the inventory, and citywide monitoring runs at or above the federal action level — making an in-home read a standard household-level step.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Tomales, CA