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Updated 2026-10-15
County water report

Clay County Water Quality: 4 Cities Ranked by the Records

Clay County, Missouri: 4 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Clay County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 3 systems of 4 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest53 µg/L
Lead (90th percentile)Detected in 2 systems of 4 tested15 µg/L federal action level · US EPAHighest4.61 µg/L
Perfluorobutanoic acid (PFBA)Detected in 2 systems of 4 testedNo federal or state limit; shown for transparencyHighest7.7 ng/L
  • SMITHVILLE PWS7.7 ng/LSample date: 2025-02-03 to 2025-11-12
  • KEARNEY PWS6.5 ng/LSample date: 2024-01-08 to 2024-10-15
  • EXCELSIOR SPRINGS PWSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-04-16 to 2024-10-14
  • LIBERTY PWSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-04-16 to 2025-10-21
28 PFAS tested, none detected in any systemShow

Tested in these 4 systems: EXCELSIOR SPRINGS PWS, KEARNEY PWS, LIBERTY PWS, SMITHVILLE PWS

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorobutanesulfonic acid (PFBS)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorohexanesulfonic acid (PFHxS)
  • Perfluorohexanoic acid (PFHxA)
  • Perfluorononanoic acid (PFNA)
  • Perfluorooctanesulfonic acid (PFOS)
  • Perfluorooctanoic acid (PFOA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluoropentanoic acid (PFPeA)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
4 cities

Cities ranked by the records

Showing 4 of 4 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Clay CountyPFAS detected in 2 of 4 cities; none had a sample above a 2024 EPA limit
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Missouri
Lead

0of 4 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Missouri
Who supplies the county

Largest water systems

  1. LibertyLIBERTY PWS · MO1010466
    30,800 served
  2. KearneyKEARNEY PWS · MO1010416
    11,500 served
  3. Excelsior SpringsEXCELSIOR SPRINGS PWS · MO1010261
    11,084 served
  4. SmithvilleSMITHVILLE PWS · MO1010748
    10,885 served
Questions

Frequently asked

How does Clay County tap water compare across cities?

PurityMap ranks 4 cities in Clay County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Kearney's main water system: KEARNEY PWS · PWSID MO1010416 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Clay County cities had a PFAS sample above a 2024 EPA limit?

None of the 4 Clay County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 2.

Is there lead in Clay County tap water?

Utilities report lead as a 90th-percentile result from home taps. 2 of 4 Clay County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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