Las Positas Mutual Water Company
EPA ID: CA4200572 · 200 people served · 2 ZIP codes
ZipCheckup's reading of EPA records for Las Positas Mutual Water Company (CA4200572): 1 violation on record since 2021. Looking at the EPA enforcement file for Las Positas Mutual Water Company, 1 violation is listed in the dataset, and none is recorded as open for the 200 people in its service area.
Data: EPA SDWIS
Service Area Map
Coverage area for Las Positas Mutual Water Company Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Las Positas Mutual Water Company have a median household income of $128,212 and about 36,124 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 85% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Las Positas 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.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in California
System Overview
Las Positas Mutual Water Company (EPA ID: CA4200572) is a community water system in California that serves approximately 200 people from groundwater sources.
This system provides water to 2 ZIP codes across 1 community.
Violation History
Status breakdown for accepted records with record years 2021-2026: 1 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| January 1, 2021 | Nitrate | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Nitrate | Monitoring & Reporting | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0 mg/L | No | N/A |
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.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Las Positas Mutual Water Company (CA4200572) on EPA.gov.
Frequently Asked Questions
Is Las Positas Mutual Water Company water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Las Positas Mutual Water Company; its 1 accepted 2021-2026 record are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Las Positas Mutual Water Company serve?
Las Positas Mutual Water Company serves approximately 200 people across 2 ZIP codes in California.
Where does Las Positas Mutual Water Company get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Las Positas Mutual Water Company (CA): 1 EPA Violation. https://zipcheckup.com/water-system/ca4200572/
@misc{zipcheckup-water-system-ca4200572,
author = {{ZipCheckup}},
title = {{Las Positas Mutual Water Company (CA): 1 EPA Violation}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ca4200572/}
}
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Las Positas Mutual Water Company (EPA ID: CA4200572) - request the latest Consumer Confidence Report or ask about specific contaminants.