Rancho Robles Mutual Water Company
EPA ID: CA4300577 · 103 people served · 1 ZIP code
ZipCheckup's reading of EPA records for Rancho Robles Mutual Water Company (CA4300577): no drinking-water violations recorded since 2021. Searching the federal compliance records for Rancho Robles Mutual Water Company turns up no EPA violations in any contaminant category the file covers; the utility's service area includes approximately 103 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Rancho Robles Mutual Water Company Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Rancho Robles Mutual Water Company have a median household income of $157,458 and about 6,766 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 76% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Rancho Robles Mutual Water Company's water is classified in EPA records as a groundwater source. 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.
Superfund Proximity Note: This service area ranks in the 80th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in California
System Overview
Rancho Robles Mutual Water Company (EPA ID: CA4300577) is a community water system in California that serves approximately 103 people from groundwater sources.
This system serves ZIP code 95046 in San Martin.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0014 mg/L | No | 2024-12-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
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: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by CA or modeled from parcel and building-footprint data.
- 95046 - San Martin
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Rancho Robles Mutual Water Company (CA4300577) on EPA.gov.
Frequently Asked Questions
Is Rancho Robles Mutual Water Company water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Rancho Robles Mutual Water Company in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Rancho Robles Mutual Water Company serve?
Rancho Robles Mutual Water Company serves approximately 103 people across 1 ZIP code in California.
Where does Rancho Robles Mutual Water Company get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Rancho Robles Mutual Water Company Water Quality Report, CA. https://zipcheckup.com/water-system/ca4300577/
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title = {{Rancho Robles Mutual Water Company Water Quality Report, CA}},
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url = {https://zipcheckup.com/water-system/ca4300577/}
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