San Miguel, CA Water Safety: 72/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
San Miguel's tap water quality puts it in CA's upper tier — health-based violations are rare and the compliance record is consistently above average.
How San Miguel Compares
Data: EPA SDWIS Last verified: 2026-06-03
San Miguel Water: The Quick Version
- Homes built before 1986: 34% — older plumbing may contain lead solder.
- Estimated remediation: $400 per household.
- CDC health risk index: 11.65.
Water Systems Serving San Miguel
Structurally, San Miguel, CA's water supply is divided. Federal data identifies 2 water systems in the area, with 2 providers serving the bulk of residential connections. These utilities operate independently, meaning rate-setting authority and EPA compliance accountability are distributed rather than centralized.
Overview
We track water quality and home safety data for 1 ZIP code in San Miguel, California, covering 2 community water systems serving approximately 5,007 people.
No EPA violations recorded across any ZIP codes in San Miguel — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for San Miguel: B (72/100)
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
San Miguel water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for San Miguel
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 93451 | B | San Miguel Community Services District | 2,600 |
All ZIP Codes in San Miguel
- 93451 [B]
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.
CDC Health Data for San Miguel
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
How Old Is San Miguel's Housing Stock?
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Pre-1986 construction carries elevated plumbing-era lead risk because lead solder was widely used before that federal ban. In San Miguel, the median build year of 1993 indicates a housing stock where that older fraction represents a significant share of the residential inventory.
Most homes in San Miguel were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
San Miguel: Remediation Cost in Perspective
Across San Miguel, the equity share taken up by estimated remediation is small — a favorable ratio for most property owners.
Remediation costs in San Miguel are relatively low compared to home values. The $0–$800 estimated range is a small fraction of median property value. Home values are 21% below the California average.
Protecting Children from Lead in San Miguel
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.
When older housing represents 34% of the local inventory or aggregate readings approach the federal action level, an in-home check becomes the standard way to translate citywide averages into the specific reality of an individual San Miguel address.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for San Miguel, CA