Bass Lake Annex 3
EPA ID: CA2000501 · 42 people served · 2 ZIP codes
In the most recent EPA reporting cycle, Bass Lake Annex 3 carried 5 violations still marked as unresolved — each remains active in the federal enforcement ledger while the utility continues operations for its service population of approximately 42 people across the area it supplies.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 69% chance of violation in next 12 months
Violations went from 4 (2023) to 4 (2025). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Bass Lake Annex 3 Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Bass Lake Annex 3 serves a community with a median household income of $129,750 and an estimated 815 residents across its service area. Approximately 63% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 52% 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?
Bass Lake Annex 3'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 Madera County, California rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How Bass Lake Annex 3 compares to EPA limits
What This Means For You
Contaminant 1080 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. 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
BASS LAKE ANNEX 3 (EPA ID: CA2000501) is a community water system in California that serves approximately 42 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Average Home Safety Score: D (49/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2025 | Combined Radium | Health-based | Unresolved |
| April 1, 2025 | Combined Radium | Health-based | Unresolved |
| October 1, 2024 | Contaminant 1080 | Monitoring | Resolved |
| January 1, 2024 | Combined Radium | Health-based | Unresolved |
| July 1, 2023 | Combined Radium | Health-based | Unresolved |
| January 1, 2023 | Combined Radium | Health-based | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Combined Radium | Radionuclides | 5 | Yes |
| Contaminant 1080 | Other Violation | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 93669 | 0.012 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
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
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Bass Lake Annex 3 (CA2000501) on EPA.gov.
Frequently Asked Questions
Is Bass Lake Annex 3 water safe to drink?
Bass Lake Annex 3 has recorded 5 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Bass Lake Annex 3 serve?
Bass Lake Annex 3 serves approximately 42 people across 2 ZIP codes in California.
Where does Bass Lake Annex 3 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.
Frequently Asked Questions
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
Bass Lake Annex 3 (EPA ID: CA2000501) — request the latest Consumer Confidence Report or ask about specific contaminants.