Humboldt Bay Mwd
EPA ID: CA1210013 · 680 people served · 13 ZIP codes
With a five-year violation-free history, Humboldt Bay Mwd delivers safe water to 680 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Humboldt Bay Mwd Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Humboldt Bay Mwd serves a community with a median household income of $72,808 and an estimated 97,738 residents across its service area. 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 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.
About 2% of homes in Humboldt County, California rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
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
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 13 ZIP codes across 11 communities.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
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: 12 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 1 additional ZIP inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 95501 — Eureka
- 95502 — 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 the full compliance record for Humboldt Bay Mwd (CA1210013) on EPA.gov.
Frequently Asked Questions
Is Humboldt Bay Mwd water safe to drink?
Based on EPA records, Humboldt Bay Mwd has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Humboldt Bay Mwd serve?
Humboldt Bay Mwd serves approximately 680 people across 13 ZIP codes in California.
Where does Humboldt Bay Mwd get its water?
The primary water source is groundwater.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.