Clearlake Oaks County Water District
EPA ID: CA1710001 · 2,359 people served · 2 ZIP codes
ZipCheckup's reading of EPA SDWIS for Clearlake Oaks County Water District (CA1710001): 2 past health-based violations, since resolved. Looking at the EPA enforcement file for Clearlake Oaks County Water District, 2 violations appear in the five-year dataset, but none remain open - the utility has addressed each finding and is in current compliance, with no pending enforcement affecting the 2,359 people in its service area.
Data: EPA SDWIS
Service Area Map
Coverage area for Clearlake Oaks County Water District Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Clearlake Oaks County Water District serves a community with a median household income of $42,625 and an estimated 20,533 residents across its service area. Approximately 67% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 73% 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?
Clearlake Oaks County Water District's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
Superfund Proximity Note: This service area ranks in the 60th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
Detected Contaminants
How Clearlake Oaks County Water District compares to EPA limits
What This Means For You
Haloacetic Acids (HAA5) at 2 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 2 detections recorded.
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
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
Clearlake Oaks County Water District (EPA ID: CA1710001) is a community water system in California that serves approximately 2,359 people from surface water sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 2 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 |
|---|---|---|---|
| October 1, 2023 | Haloacetic Acids (HAA5) | Health-based | Resolved |
| April 1, 2021 | Haloacetic Acids (HAA5) | Health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 2 | Yes |
Health Risk Details
Haloacetic Acids (HAA5) (EPA limit: 0.06 mg/L)
Cancer risk; reproductive & developmental effects At-risk groups: pregnant women, infants, long-term consumers of chlorinated municipal water.
Removal methods: granular activated carbon (GAC), carbon block filter, reverse osmosis. Find the right filter →
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.
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 Clearlake Oaks County Water District (CA1710001) on EPA.gov.
Frequently Asked Questions
Is Clearlake Oaks County Water District water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Clearlake Oaks County Water District; its 2 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Clearlake Oaks County Water District serve?
Clearlake Oaks County Water District serves approximately 2,359 people across 2 ZIP codes in California.
Where does Clearlake Oaks County Water District get its water?
The primary water source is surface water.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Clearlake Oaks County Water District: 2 Health Violations. https://zipcheckup.com/water-system/ca1710001/
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author = {{ZipCheckup}},
title = {{Clearlake Oaks County Water District: 2 Health Violations}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ca1710001/}
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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
Clearlake Oaks County Water District (EPA ID: CA1710001) - request the latest Consumer Confidence Report or ask about specific contaminants.