States › Idaho › Kootenai County

Kootenai County, ID Water Quality

Water quality data for 11 public water systems serving Kootenai County, Idaho — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 11 water systems · 15 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

Kootenai County Earns a B

Kootenai County: 15 communities across 11 water systems. 80.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 12 communities with a lead detection, 3 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 4 with significant inspection deficiencies
  • 80.0% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
11
Water Systems
Active CWS & NTNCWS
80%
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
  • Coeur d'Alene
    2.00 ppb
    No federal limits exceeded on record
    A
  • Hayden
    Not detected
    No federal limits exceeded on record
    A
  • Rathdrum
    1.00 ppb
    No federal limits exceeded on record
    A
  • Dalton Gardens
    2.00 ppb
    No federal limits exceeded on record
    A
  • Hauser
    3.00 ppb
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Worley
    2.00 ppb
    4 violations currently open
    D
  • Harrison
    6.00 ppb
    1 violation currently open
    D
  • Conkling Park
    1.00 ppb
    1 violation currently open
    D
  • Spirit Lake
    2.00 ppb
    Copper above the 1,300 ppb action level
    B
  • Rockford Bay
    Not detected
    1 significant inspection deficiency
    B
County Lead Level — Median 2 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2 ppb — 13.3% of the federal action level
Systems by Lead Level
Under 5 ppb
11
5 – 10 ppb
1
No Data
3

All Cities in Kootenai County

Coeur d'Alene 2.00 ppb A
Post Falls 1.00 ppb A
Hayden Not detected A
Rathdrum 1.00 ppb A
Spirit Lake 2.00 ppb B
Dalton Gardens 2.00 ppb A
Hauser 3.00 ppb B
Athol 2.00 ppb B
Hayden Lake Not detected A
Worley 2.00 ppb D
Harrison 6.00 ppb D
Huetter 2.00 ppb A
Rockford Bay Not detected B
Conkling Park 1.00 ppb D
State Line 1.00 ppb A
Showing 15 cities
No active violations Active violations

About Kootenai County Drinking Water

Kootenai County is served by 11 water systems covering 15 communities. 80% have no open violations.

Of the communities reporting lead results, 12 recorded a detection, with a median of 2.00 ppb — 13% 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 significant deficiencies at 4 of them.

Frequently Asked Questions

Is Kootenai County tap water safe to drink?▼
80% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Kootenai County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 3 reported none detected and 0 reported no result.
How many water systems serve Kootenai County?▼
11 community water systems serve 15 communities here.
← Back to Idaho water quality overview