Hemlock Mutual Water Company
EPA ID: CA1910053 · 686 people served · 2 ZIP codes
ZipCheckup's reading of EPA SDWIS for Hemlock Mutual Water Company (CA1910053): 2 unresolved EPA violations on record. With 2 unresolved EPA violations, Hemlock Mutual Water Company is currently out of full compliance - approximately 686 people in 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
Service Area Demographics
The Hemlock Mutual Water Company serves a community with a median household income of $97,342 and an estimated 90,162 residents across its service area. Approximately 77% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 49% 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?
Hemlock 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.
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
Detected Contaminants
How Hemlock Mutual Water Company compares to EPA limits
What This Means For You
Lead and Copper Rule at 4 mg/L exceeds the EPA maximum of mg/L.
Stage 2 DBP Rule at 2 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. 9 detections recorded. 3 exceed federal EPA limits (4 ppt for PFOA/PFOS). 2 exceed state limits.
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 | Stage 2 DBP Rule | Health-based | Unaddressed (current) |
| October 17, 2024 | Stage 2 DBP Rule | Non-health-based | Unaddressed (current) |
| July 1, 2024 | Lead and Copper Rule | Non-health-based | Resolved |
| January 1, 2024 | Lead and Copper Rule | Non-health-based | Resolved |
| October 1, 2023 | Lead and Copper Rule | Non-health-based | Resolved |
| July 1, 2023 | Lead and Copper Rule | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Lead and Copper Rule | Treatment Failure | 4 | No |
| Stage 2 DBP Rule | Treatment Failure | 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: 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 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/
@misc{zipcheckup-water-system-ca1910053,
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.