San Miguel, CA Water Safety: 72/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-07-19
ZipCheckup grade for San Miguel: B.
This ZIP looks solid, with a few items worth a quick check.
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: 2026-07-19
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.
- B
- B
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 are recorded for the tracked water systems in San Miguel as of the latest reporting period.
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