Gran Mutual Water Company
EPA ID: CA0400008 · 290 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for Gran Mutual Water Company (CA0400008): 1 EPA violation in the last five years. Federal water data for Gran Mutual Water Company logs 1 historical violation - all addressed and cleared, leaving the utility in current compliance for 290 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Gran Mutual Water Company Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Gran Mutual Water Company serves a community with a median household income of $65,350 and an estimated 37,533 residents across its service area. Approximately 56% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 41% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
Gran Mutual 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.
Infrastructure Risk
Detected Contaminants
How Gran Mutual Water Company compares to EPA limits
What This Means For You
Surface Water Treatment Rule at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 6 detections recorded. 3 exceed federal EPA limits (4 ppt for PFOA/PFOS). 2 exceed state limits.
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
Gran Mutual Water Company (EPA ID: CA0400008) is a community water system in California that serves approximately 290 people from groundwater sources.
This system serves ZIP code 95928 in Chico.
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 |
|---|---|---|---|
| July 1, 2025 | Surface Water Treatment Rule | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Surface Water Treatment Rule | Treatment Failure | 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: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
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.
- 95928 - Chico
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Gran Mutual Water Company (CA0400008) on EPA.gov.
Frequently Asked Questions
Is Gran Mutual Water Company water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Gran 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 Gran Mutual Water Company serve?
Gran Mutual Water Company serves approximately 290 people across 1 ZIP code in California.
Where does Gran Mutual Water Company get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Gran Mutual Water Company (CA): 1 EPA Violation. https://zipcheckup.com/water-system/ca0400008/
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author = {{ZipCheckup}},
title = {{Gran Mutual Water Company (CA): 1 EPA Violation}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ca0400008/}
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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
Gran Mutual Water Company (EPA ID: CA0400008) - request the latest Consumer Confidence Report or ask about specific contaminants.