States › Alaska › Yukon-Koyukuk Census Area

Yukon-Koyukuk Census Area, AK Water Quality

Water quality data for 22 public water systems serving Yukon-Koyukuk Census Area, Alaska — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 22 water systems · 22 cities
⚠️
Caution Advised — Some Systems Need Attention

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

C

Yukon-Koyukuk Census Area Earns a C

Yukon-Koyukuk Census Area: 22 communities across 22 water systems. 81.8% have no open violations.

  • Median lead where detected: 2.30 ppb
  • 21 communities with a lead detection, 1 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 18 with significant inspection deficiencies
  • 81.8% of communities have no open violations
2.3 ppb
Median Lead Level
County-wide, 90th percentile
22
Water Systems
Active CWS & NTNCWS
81%
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
  • Manley Hot Springs
    Not detected
    1 health-based violation since 2015
    B
  • Nenana
    0.70 ppb
    2 significant inspection deficiencies
    B
  • McGrath
    0.90 ppb
    23 health-based violations since 2015
    B
  • Beaver
    9.00 ppb
    2 significant inspection deficiencies
    B
  • Fort Yukon
    4.60 ppb
    Copper above the 1,300 ppb action level
    B
⚠ Needs Attention
  • Grayling
    2.00 ppb
    Copper above the 1,300 ppb action level
    F
  • Rampart
    3.40 ppb
    Copper above the 1,300 ppb action level
    F
  • Galena
    3.60 ppb
    Copper above the 1,300 ppb action level
    F
  • Anvik
    0.41 ppb
    2 violations currently open
    F
  • Circle
    2.40 ppb
    Copper above the 1,300 ppb action level
    D
County Lead Level — Median 2.3 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.3 ppb — 15.3% of the federal action level
Systems by Lead Level
Under 5 ppb
17
5 – 10 ppb
4
No Data
1

All Cities in Yukon-Koyukuk Census Area

Allakaket 1.20 ppb C
Anvik 0.41 ppb F
Beaver 9.00 ppb B
Chalkyitsik 5.50 ppb D
Circle 2.40 ppb D
Fort Yukon 4.60 ppb B
Galena 3.60 ppb F
Grayling 2.00 ppb F
Holy Cross 1.80 ppb C
Hughes 2.60 ppb C
Kaltag 2.10 ppb D
Koyukuk 5.50 ppb C
Manley Hot Springs Not detected B
McGrath 0.90 ppb B
Minto 0.34 ppb C
Nenana 0.70 ppb B
Nulato 2.30 ppb C
Rampart 3.40 ppb F
Ruby 9.00 ppb D
Shageluk 0.71 ppb C
Stevens Village 4.50 ppb C
Tanana 1.60 ppb D
Showing 22 cities
No active violations Active violations

About Yukon-Koyukuk Census Area Drinking Water

Yukon-Koyukuk Census Area is served by 22 water systems covering 22 communities. 82% have no open violations.

Of the communities reporting lead results, 21 recorded a detection, with a median of 2.30 ppb — 15% of the federal action level. 1 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 18 of them.

Frequently Asked Questions

Is Yukon-Koyukuk Census Area tap water safe to drink?▼
82% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Yukon-Koyukuk Census Area?▼
Among communities with a detection the median is 2.30 ppb, 15% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Yukon-Koyukuk Census Area?▼
22 community water systems serve 22 communities here.
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