States › California › Humboldt County

Humboldt County, CA Water Quality

Water quality data for 25 public water systems serving Humboldt County, California — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 25 water systems · 37 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Humboldt County Earns a B

Humboldt County: 37 communities across 25 water systems. 89.2% have no open violations.

  • Median lead where detected: 1.60 ppb
  • 31 communities with a lead detection, 6 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 1 with significant inspection deficiencies
  • 89.2% of communities have no open violations
1.6 ppb
Median Lead Level
County-wide, 90th percentile
25
Water Systems
Active CWS & NTNCWS
89%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Ferndale
    3.50 ppb
    No federal limits exceeded on record
    B
  • Redway
    2.10 ppb
    No federal limits exceeded on record
    B
  • Shelter Cove
    1.26 ppb
    No federal limits exceeded on record
    B
  • Loleta
    2.72 ppb
    No federal limits exceeded on record
    B
  • Garberville
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Willow Creek
    Not detected
    1 violation currently open
    C
  • Hydesville
    2.00 ppb
    1 violation currently open
    C
  • Phillipsville
    4.38 ppb
    1 violation currently open
    C
  • Myers Flat
    1.80 ppb
    1 violation currently open
    C
  • Trinidad
    1.54 ppb
    Copper above the 1,300 ppb action level
    B
County Lead Level — Median 1.6 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.6 ppb — 10.7% of the federal action level
Systems by Lead Level
Under 5 ppb
30
5 – 10 ppb
1
No Data
6

All Cities in Humboldt County

Eureka 1.60 ppb B
Fortuna 1.80 ppb A
Arcata 1.60 ppb B
McKinleyville 1.60 ppb B
Rio Dell Not detected A
Myrtletown 1.60 ppb B
Hoopa 2.50 ppb A
Humboldt Hill 1.60 ppb B
Pine Hills 1.60 ppb B
Cutten 1.60 ppb B
Willow Creek Not detected C
Ferndale 3.50 ppb B
Redway 2.10 ppb B
Hydesville 2.00 ppb C
Bayview 1.60 ppb B
Indianola 1.60 ppb B
Shelter Cove 1.26 ppb B
Loleta 2.72 ppb B
Garberville Not detected B
Scotia Not detected B
Blue Lake Not detected A
Westhaven-Moonstone 2.20 ppb B
Manila 1.60 ppb B
Fieldbrook 1.60 ppb B
Miranda 1.65 ppb B
Benbow Not detected B
Trinidad 1.54 ppb B
Orick 7.35 ppb B
Samoa 1.60 ppb B
Weott 1.57 ppb B
Fairhaven 1.60 ppb B
Fields Landing 2.05 ppb A
Phillipsville 4.38 ppb C
Alderpoint 2.55 ppb B
Myers Flat 1.80 ppb C
Big Lagoon 4.25 ppb B
Redcrest 3.20 ppb B
Showing 37 cities
No active violations Active violations

About Humboldt County Drinking Water

Humboldt County is served by 25 water systems covering 37 communities. 89% have no open violations.

Of the communities reporting lead results, 31 recorded a detection, with a median of 1.60 ppb — 11% of the federal action level. 6 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 1 of them.

Frequently Asked Questions

Is Humboldt County tap water safe to drink?▼
89% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Humboldt County?▼
Among communities with a detection the median is 1.60 ppb, 11% of the 15 ppb action level. 6 reported none detected and 0 reported no result.
How many water systems serve Humboldt County?▼
25 community water systems serve 37 communities here.
← Back to California water quality overview