Sierra Linda Mutual Water Company
EPA ID: CA2000506 · 200 people served · 1 ZIP code
Pulled from the federal compliance ledger, 24 violations at Sierra Linda Mutual Water Company remain without resolution — the utility delivers drinking water to roughly 200 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Sierra Linda Mutual Water Company Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Sierra Linda Mutual Water Company serves a community with a median household income of $67,612 and an estimated 2,778 residents across its service area. Approximately 64% 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?
Sierra Linda 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.
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 Sierra Linda Mutual Water Company compares to EPA limits
What This Means For You
Contaminant 4109 at 7 mg/L exceeds the EPA maximum of mg/L.
Barium at 12 mg/L exceeds the EPA maximum of 2 mg/L.
Contaminant 1032 at 2 mg/L exceeds the EPA maximum of mg/L.
Stage 2 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Contaminant 2414 at 1 mg/L exceeds the EPA maximum of mg/L.
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
Sierra Linda Mutual Water Company (EPA ID: CA2000506) is a community water system in California that serves approximately 200 people from groundwater sources.
This system serves ZIP code 93643 in North Fork.
Average Home Safety Score: D (50/100)
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 |
|---|---|---|---|
| April 1, 2025 | Contaminant 4109 | Health-based | Unresolved |
| January 1, 2025 | Contaminant 1032 | Health-based | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Unresolved |
| October 1, 2024 | Contaminant 4109 | Health-based | Unresolved |
| April 1, 2024 | Contaminant 4109 | Health-based | Unresolved |
| January 1, 2024 | Contaminant 4109 | Health-based | Unresolved |
| October 1, 2023 | Contaminant 4109 | Health-based | Unresolved |
| July 1, 2023 | Contaminant 4109 | Health-based | Unresolved |
| April 1, 2023 | Contaminant 4109 | Health-based | Unresolved |
| April 1, 2023 | Barium | Health-based | Unresolved |
| January 1, 2023 | Contaminant 1032 | Health-based | Unresolved |
| January 1, 2023 | Barium | Health-based | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Barium | Inorganic | 12 | Yes |
| Contaminant 4109 | Other Violation | 7 | Yes |
| Contaminant 1032 | Other Violation | 2 | Yes |
| Stage 2 DBP Rule | Treatment Failure | 2 | Yes |
| Contaminant 2414 | 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 |
|---|---|---|---|
| 93643 | 0.0031 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
- 93643 — North Fork
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Sierra Linda Mutual Water Company (CA2000506) on EPA.gov.
Frequently Asked Questions
Is Sierra Linda Mutual Water Company water safe to drink?
Sierra Linda Mutual Water Company has recorded 22 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 Sierra Linda Mutual Water Company serve?
Sierra Linda Mutual Water Company serves approximately 200 people across 1 ZIP code in California.
Where does Sierra Linda Mutual Water Company 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
Sierra Linda Mutual Water Company (EPA ID: CA2000506) — request the latest Consumer Confidence Report or ask about specific contaminants.