Oak Knolls Mutual Water Company
EPA ID: CA1500465 · 123 people served · 1 ZIP code
Across every monitored period in the past five years, Oak Knolls Mutual Water Company reported no EPA violations for its service population of 123.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 10 (2024) to 5 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Oak Knolls Mutual Water Company Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Oak Knolls Mutual Water Company serves a community with a median household income of $28,535 and an estimated 5,622 residents across its service area. Approximately 83% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 67% 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?
Oak Knolls 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 Kern 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
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
Oak Knolls Mutual Water Company (EPA ID: CA1500465) is a community water system in California that serves approximately 123 people from groundwater sources.
This system serves ZIP code 93240 in Lake Isabella.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
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
- 93240 — Lake Isabella
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Oak Knolls Mutual Water Company (CA1500465) on EPA.gov.
Frequently Asked Questions
Is Oak Knolls Mutual Water Company water safe to drink?
Based on EPA records, Oak Knolls Mutual Water Company has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Oak Knolls Mutual Water Company serve?
Oak Knolls Mutual Water Company serves approximately 123 people across 1 ZIP code in California.
Where does Oak Knolls Mutual Water Company get its water?
The primary water source is groundwater.