Humboldt Bay Mwd
EPA ID: CA1210013 · 680 people served · 12 ZIP codes
ZipCheckup's reading of EPA records for Humboldt Bay Mwd (CA1210013): no drinking-water violations recorded since 2021. EPA lists no violations for Humboldt Bay Mwd, serving 680 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Humboldt Bay Mwd Source: EPA SDWIS service area boundaries.
Service area boundary - average Home Safety grade of mapped ZIPs: A
Demographics of ZIP Codes Served
The ZIP codes associated with Humboldt Bay Mwd have a median household income of $72,808 and about 97,738 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 74% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Humboldt Bay 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
System Overview
Humboldt Bay Mwd (EPA ID: CA1210013) is a community water system in California that serves approximately 680 people from groundwater sources.
This system provides water to 12 ZIP codes across 11 communities.
ZIP-Area Home Safety Context: A (99/100)
This is the average Home Safety Score for 7 of 12 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.
Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0016 mg/L | No | 2023-12-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
12 of 12 ZIP records with known zones are in EPA Radon Zone 3.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
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.
- 95501 - Eureka
- 95503 - Eureka
- 95519 - Mckinleyville
- 95521 - Arcata
- 95524 - Bayside
- 95525 - Blue Lake
- 95537 - Fields Landing
- 95549 - Kneeland
- 95550 - Korbel
- 95551 - Loleta
- 95564 - Samoa
- 95570 - Trinidad
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Humboldt Bay Mwd (CA1210013) on EPA.gov.
Frequently Asked Questions
Is Humboldt Bay Mwd water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Humboldt Bay Mwd in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Humboldt Bay Mwd serve?
Humboldt Bay Mwd serves approximately 680 people across 12 ZIP codes in California.
Where does Humboldt Bay Mwd get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Humboldt Bay Mwd Water Quality Report, CA. https://zipcheckup.com/water-system/ca1210013/
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title = {{Humboldt Bay Mwd Water Quality Report, CA}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ca1210013/}
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