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Siskiyou County, CA Water Quality

Water quality data for 16 public water systems serving Siskiyou County, California — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 16 water systems · 16 cities
⚠️
Caution Advised — Some Systems Need Attention

Some systems have elevated lead levels or active violations. Check your specific city below.

C

Siskiyou County Earns a C

Siskiyou County: 16 communities across 16 water systems. 43.8% have no open violations.

  • Median lead where detected: 1.68 ppb
  • 13 communities with a lead detection, 3 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 43.8% of communities have no open violations
1.68 ppb
Median Lead Level
County-wide, 90th percentile
16
Water Systems
Active CWS & NTNCWS
43%
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
  • Fort Jones
    3.10 ppb
    No federal limits exceeded on record
    B
  • Etna
    1.92 ppb
    No federal limits exceeded on record
    B
  • Weed
    Not detected
    Copper above the 1,300 ppb action level
    B
  • McCloud
    2.44 ppb
    4 health-based violations since 2015
    B
  • Hornbrook
    5.86 ppb
    5 health-based violations since 2015
    B
⚠ Needs Attention
  • Mount Shasta
    1.36 ppb
    Copper above the 1,300 ppb action level
    D
  • Dunsmuir
    6.55 ppb
    Copper above the 1,300 ppb action level
    C
  • Yreka
    0.60 ppb
    1 violation currently open
    C
  • Lake Shastina
    1.68 ppb
    1 violation currently open
    C
  • Montague
    1.56 ppb
    1 violation currently open
    C
County Lead Level — Median 1.68 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.68 ppb — 11.2% of the federal action level
Systems by Lead Level
Under 5 ppb
10
5 – 10 ppb
3
No Data
3

All Cities in Siskiyou County

Yreka 0.60 ppb C
Mount Shasta 1.36 ppb D
Weed Not detected B
Lake Shastina 1.68 ppb C
Dunsmuir 6.55 ppb C
Montague 1.56 ppb C
McCloud 2.44 ppb B
Tulelake 1.60 ppb C
Happy Camp 1.62 ppb C
Fort Jones 3.10 ppb B
Etna 1.92 ppb B
Dorris Not detected C
Grenada 7.18 ppb C
Hornbrook 5.86 ppb B
Carrick 0.87 ppb C
Tennant Not detected C
Showing 16 cities
No active violations Active violations

About Siskiyou County Drinking Water

Siskiyou County is served by 16 water systems covering 16 communities. 44% have no open violations.

Of the communities reporting lead results, 13 recorded a detection, with a median of 1.68 ppb — 11% of the federal action level. 3 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 no significant deficiencies.

Frequently Asked Questions

Is Siskiyou County tap water safe to drink?▼
44% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Siskiyou County?▼
Among communities with a detection the median is 1.68 ppb, 11% of the 15 ppb action level. 3 reported none detected and 0 reported no result.
How many water systems serve Siskiyou County?▼
16 community water systems serve 16 communities here.
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