Big Basin Water Company
EPA ID: CA4410001 · 1,120 people served · 3 ZIP codes
ZipCheckup's reading of EPA SDWIS for Big Basin Water Company (CA4410001): 10 EPA violations in the last five years. Big Basin Water Company's record shows 10 remedied violations - all cleared, currently compliant, 1,120 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Big Basin Water Company Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Big Basin Water Company serves a community with a median household income of $128,483 and an estimated 19,055 residents across its service area. Approximately 79% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Big Basin 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.
Superfund Proximity Note: This service area ranks in the 60th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Detected Contaminants
How Big Basin Water Company compares to EPA limits
What This Means For You
Haloacetic Acids (HAA5) at 4 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Total Trihalomethanes (TTHM) at 4 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Consumer Confidence Report Rule at 2 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. 3 detections recorded. 1 exceeds federal EPA limits (4 ppt for PFOA/PFOS).
Haloacetic Acids (HAA5) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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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
Big Basin Water Company (EPA ID: CA4410001) is a community water system in California that serves approximately 1,120 people from groundwater sources.
This system provides water to 3 ZIP codes across 3 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 10 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 |
|---|---|---|---|
| June 1, 2022 | Consumer Confidence Report Rule | Non-health-based | Resolved |
| January 1, 2022 | Total Trihalomethanes (TTHM) | Non-health-based | Resolved |
| January 1, 2022 | Haloacetic Acids (HAA5) | Non-health-based | Resolved |
| October 1, 2021 | Consumer Confidence Report Rule | Non-health-based | Resolved |
| July 1, 2021 | Haloacetic Acids (HAA5) | Non-health-based | Resolved |
| July 1, 2021 | Total Trihalomethanes (TTHM) | Non-health-based | Resolved |
| April 1, 2021 | Haloacetic Acids (HAA5) | Non-health-based | Resolved |
| April 1, 2021 | Total Trihalomethanes (TTHM) | Non-health-based | Resolved |
| January 1, 2021 | Haloacetic Acids (HAA5) | Non-health-based | Resolved |
| January 1, 2021 | Total Trihalomethanes (TTHM) | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 4 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 4 | No |
| Consumer Confidence Report Rule | Reporting Failure | 2 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.012 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.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
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.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Big Basin Water Company (CA4410001) on EPA.gov.
Frequently Asked Questions
Is Big Basin Water Company water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Big Basin Water Company; its 10 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Big Basin Water Company serve?
Big Basin Water Company serves approximately 1,120 people across 3 ZIP codes in California.
Where does Big Basin Water Company get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Big Basin Water Company (CA): 10 EPA Violations. https://zipcheckup.com/water-system/ca4410001/
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title = {{Big Basin Water Company (CA): 10 EPA Violations}},
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url = {https://zipcheckup.com/water-system/ca4410001/}
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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
Big Basin Water Company (EPA ID: CA4410001) - request the latest Consumer Confidence Report or ask about specific contaminants.