Lake Hemet Mwd
EPA ID: CA3310022 · 52,913 people served · 3 ZIP codes
ZipCheckup's reading of EPA records for Lake Hemet Mwd (CA3310022): 1 health-based violation recorded since 2021. Lake Hemet Mwd's EPA record lists 2 historical violations, and none is listed as open in that record; the utility supplies water to 52,913 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Lake Hemet Mwd Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Lake Hemet Mwd have a median household income of $63,582 and about 125,257 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 62% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: On average, 44% 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?
Lake Hemet Mwd'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.
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
Lake Hemet Mwd (EPA ID: CA3310022) is a community water system in California that serves approximately 52,913 people from groundwater sources.
This system provides water to 3 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 |
|---|---|---|---|
| July 1, 2022 | E. COLI | Non-health-based | Resolved |
| June 1, 2022 | Revised Total Coliform Rule | Health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| E. COLI | Monitoring & Reporting | 1 | No |
| Revised Total Coliform Rule | MCL Violation | 1 | Yes |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| Below the reporting limit | No | 2025-12-31 |
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 Lake Hemet Mwd (CA3310022) on EPA.gov.
Frequently Asked Questions
Is Lake Hemet Mwd water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Lake Hemet Mwd; 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 Lake Hemet Mwd serve?
Lake Hemet Mwd serves approximately 52,913 people across 3 ZIP codes in California.
Where does Lake Hemet Mwd get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: No PFAS Reported Above Reporting Levels
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were reported above UCMR5 minimum reporting levels.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
- #26 / 50 Highest Exposure Burden (California)
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Lake Hemet Mwd (CA): 1 Health Violation. https://zipcheckup.com/water-system/ca3310022/
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author = {{ZipCheckup}},
title = {{Lake Hemet Mwd (CA): 1 Health Violation}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ca3310022/}
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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
Lake Hemet Mwd (EPA ID: CA3310022) - request the latest Consumer Confidence Report or ask about specific contaminants.