Hemlock Mutual Water Company
EPA ID: CA1910053 · 686 people served · 2 ZIP codes
ZipCheckup's reading of EPA records for Hemlock Mutual Water Company (CA1910053): 2 violations recorded with unresolved status in the SDWIS data used. Hemlock Mutual Water Company has 2 EPA violations listed as open in the reviewed federal record - approximately 686 people fall within its service area.
Data: EPA SDWIS
Service Area Map
Coverage area for Hemlock Mutual Water Company Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Hemlock Mutual Water Company have a median household income of $97,342 and about 90,162 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 77% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: On average, 49% of census tracts in the counties mapped to this service area are designated disadvantaged by the federal Climate and Economic Justice Screening Tool (CEJST, 2022 version). 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?
Hemlock Mutual Water Company's water is classified in EPA records as a groundwater source. 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 70th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
PFAS in ZIP Codes This System Serves
PFAS ("forever chemicals") have been reported in samples from water systems associated with the ZIP codes in this system's area. These results can come from other water systems serving the same ZIP codes; check the UCMR5 section for any results reported for this system. 9 detections recorded. 3 detections are above the level of a federal PFAS MCL (4 ppt for PFOA and PFOS), with compliance required from 2029.
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
Hemlock Mutual Water Company (EPA ID: CA1910053) is a community water system in California that serves approximately 686 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 4 resolved, 0 archived, 0 addressed, and 2 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 17, 2024 | LEAD AND COPPER RULE REVISIONS | Health-based | Unaddressed (current) |
| October 17, 2024 | LEAD AND COPPER RULE REVISIONS | Non-health-based | Unaddressed (current) |
| July 1, 2024 | Public Notice | Non-health-based | Resolved |
| January 1, 2024 | Public Notice | Non-health-based | Resolved |
| October 1, 2023 | Public Notice | Non-health-based | Resolved |
| July 1, 2023 | Public Notice | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Public Notice | Other (notice or report rule) | 4 | No |
| LEAD AND COPPER RULE REVISIONS | Treatment Technique, Monitoring & Reporting | 2 | Yes |
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.
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: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
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 available EPA compliance records for Hemlock Mutual Water Company (CA1910053) on EPA.gov.
Frequently Asked Questions
Is Hemlock Mutual Water Company water safe to drink?
The accepted 2026Q2 ECHO snapshot shows 1 current health-based noncompliance record for Hemlock Mutual Water Company. Review the utility's current notices and EPA record. This system-level compliance history cannot determine conditions at a specific tap.
How many people does Hemlock Mutual Water Company serve?
Hemlock Mutual Water Company serves approximately 686 people across 2 ZIP codes in California.
Where does Hemlock Mutual Water Company get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Hemlock Mutual Water Company (CA): 1 Health Violation. https://zipcheckup.com/water-system/ca1910053/
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author = {{ZipCheckup}},
title = {{Hemlock Mutual Water Company (CA): 1 Health Violation}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ca1910053/}
}
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
Hemlock Mutual Water Company (EPA ID: CA1910053) - request the latest Consumer Confidence Report or ask about specific contaminants.