States › Missouri › Clay County

Clay County, MO Water Quality

Water quality data for 13 public water systems serving Clay County, Missouri — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 13 water systems · 20 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Clay County Earns a A

Clay County: 20 communities across 13 water systems. 100.0% have no open violations.

  • Median lead where detected: 4.30 ppb
  • 13 communities with a lead detection, 7 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 11 with significant inspection deficiencies
  • 100.0% of communities have no open violations
4.3 ppb
Median Lead Level
County-wide, 90th percentile
13
Water Systems
Active CWS & NTNCWS
100%
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
  • Kearney
    Not detected
    No federal limits exceeded on record
    A
  • Pleasant Valley
    1.05 ppb
    No federal limits exceeded on record
    B
  • Claycomo
    1.05 ppb
    No federal limits exceeded on record
    B
  • Missouri City
    4.24 ppb
    No federal limits exceeded on record
    B
  • Birmingham
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Excelsior Springs
    Not detected
    2 significant inspection deficiencies
    B
  • Smithville
    2.69 ppb
    1 significant inspection deficiency
    B
  • Holt
    1.62 ppb
    3 health-based violations since 2015
    B
  • Mosby
    Not detected
    23 health-based violations since 2015
    B
  • Liberty
    4.61 ppb
    1 significant inspection deficiency
    B
County Lead Level — Median 4.3 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 4.3 ppb — 28.7% of the federal action level
Systems by Lead Level
Under 5 ppb
13
No Data
7

All Cities in Clay County

Liberty 4.61 ppb B
Gladstone 4.30 ppb A
Excelsior Springs Not detected B
Kearney Not detected A
North Kansas City Not detected A
Smithville 2.69 ppb B
Pleasant Valley 1.05 ppb B
Holt 1.62 ppb B
Avondale Not detected A
Oakview 4.30 ppb A
Claycomo 1.05 ppb B
Glenaire 4.61 ppb B
Oakwood 4.30 ppb A
Missouri City 4.24 ppb B
Oakwood Park 4.30 ppb A
Birmingham Not detected B
Oaks 4.30 ppb A
Paradise 2.01 ppb B
Mosby Not detected B
Prathersville Not detected B
Showing 20 cities
No active violations Active violations

About Clay County Drinking Water

Clay County is served by 13 water systems covering 20 communities. No community here has an open violation on record.

Of the communities reporting lead results, 13 recorded a detection, with a median of 4.30 ppb — 29% of the federal action level. 7 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 11 of them.

Frequently Asked Questions

Is Clay County tap water safe to drink?▼
No community in Clay County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Clay County?▼
Among communities with a detection the median is 4.30 ppb, 29% of the 15 ppb action level. 7 reported none detected and 0 reported no result.
How many water systems serve Clay County?▼
13 community water systems serve 20 communities here.
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