O'connor Tract Company-operative Water Company
EPA ID: CA4110019 · 2,789 people served · 7 ZIP codes
Throughout five consecutive years of federal water monitoring, O'connor Tract Company-operative Water Company recorded zero violations — solid performance for a utility serving 2,789 people.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for O'connor Tract Company-operative Water Company Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The O'connor Tract Company-operative Water Company serves a community with a median household income of $186,479 and an estimated 136,737 residents across its service area. Approximately 70% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
O'connor Tract Company-operative Water Company'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 1% of homes in San Mateo County, California rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 77th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 1 detection recorded.
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
O'connor Tract Company-operative Water Company (EPA ID: CA4110019) is a community water system in California that serves approximately 2,789 people from groundwater sources.
This system provides water to 7 ZIP codes across 2 communities.
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
Coverage: 2 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 5 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 94025 — Menlo Park
- 94301 — Palo Alto
- 94302 — Palo Alto
- 94303 — Palo Alto
- 94304 — Palo Alto
- 94306 — Palo Alto
- 94309 — Palo Alto
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for O'connor Tract Company-operative Water Company (CA4110019) on EPA.gov.
Frequently Asked Questions
Is O'connor Tract Company-operative Water Company water safe to drink?
Based on EPA records, O'connor Tract Company-operative Water Company has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does O'connor Tract Company-operative Water Company serve?
O'connor Tract Company-operative Water Company serves approximately 2,789 people across 7 ZIP codes in California.
Where does O'connor Tract Company-operative Water Company 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.