La Tierra Heights Mutual
EPA ID: CA2800525 · 67 people served · 1 ZIP code
For the full five-year period covered by EPA monitoring, La Tierra Heights Mutual has supplied tap water to 67 residents with no violations of any type on record.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 73% chance of violation in next 12 months
Violations went from 1 (2021) to 1 (2024). Violation counts have remained relatively steady.
Service Area Map
Coverage area for La Tierra Heights Mutual Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The La Tierra Heights Mutual serves a community with a median household income of $116,534 and an estimated 3,298 residents across its service area. Approximately 83% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
La Tierra Heights Mutual's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 2% of homes in Napa County, California rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in California
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
La Tierra Heights Mutual (EPA ID: CA2800525) is a community water system in California that serves approximately 67 people from groundwater sources.
This system serves ZIP code 94508 in Angwin.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
- 94508 — Angwin
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for La Tierra Heights Mutual (CA2800525) on EPA.gov.
Frequently Asked Questions
Is La Tierra Heights Mutual water safe to drink?
Based on EPA records, La Tierra Heights Mutual has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does La Tierra Heights Mutual serve?
La Tierra Heights Mutual serves approximately 67 people across 1 ZIP code in California.
Where does La Tierra Heights Mutual get its water?
The primary water source is groundwater.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.